History Main / AmericanCustomaryMeasurements

13th Jul '15 3:14:18 PM MarkLungo
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-->''"The metric system is the tool of the devil! My car gets forty rods to the hogshead[[note]]About 0.002 MPG...about ten and a half feet. That's very, very, bad.[[/note]], and that's the way I likes it!"''\\
- Grandpa, ''TheSimpsons''

[[Music/SirMixALot 36-24-36. (Maybe, if she's 5'3".)]]

Whereas in most of the world [[TheMetricSystemIsHereToStay the metric system has come into near-universal use]] by ordinary citizens, the United States retains a non-decimal measurement system largely derived from traditional British units. Technically speaking, the federal government has observed the metric system since it ratified the Convention on the Meter in the late 19th century, and indeed, the units described below are now legally defined through their metric equivalents rather than their historical origins. The metric system is also almost universally used by the scientific community, though UnitConfusion has sometimes arisen when American and international teams each assumed one was using the other's units. To further complicate matters, the American engineering community has held on to customary units, resulting in occasional disconnects between builders and users of scientific equipment[[note]]For example, the loss of the Mars Climate Orbiter, popularly attributed to UnitConfusion, was actually due in large part to this sort of thing (specifically, a software error -- the thruster-control algorithms used force pounds, while the high-level software worked in newtons, a problem caused by lack of communication between NASA and its contractors and exacerbated by lack of proper testing).[[/note]]. What has come to be known as the "customary system", for lack of a better term, has continued in usage in for a number of factors, including tradition, national pride, and the expense of conversion.

An attempt by Congress to mandate metric conversion in [[TheSeventies the '70s]] failed primarily due to the last reason (and lack of political will). Only the bottling industry switched, but for other reasons -- Dr. Pepper advertised the small size gain from 2 quarts to 2 liters, and all other companies followed suit, which is why 2-liter bottles (and recently, 1-liter bottles) are in metric, but smaller units are in fluid ounces (which makes a [[Literature/NUMASeries Dirk Pitt]] novel look rather funny). It didn't ''hurt'' that the bottling industry wanted to switch from heavy, expensive and fragile glass to light, cheap and durable plastic bottles at just about that time; if you're going to be retooling everything ''anyway'', might as well make it count.

In Canada, Britain (the origin of the units) and other Anglophone countries, these units also enjoy non-official use (known as "Imperial measurements", after the British Empire), though their defining values may be slightly different; an ''imperial gallon'', for example, is about 1.2 American gallons. This is, combined with mixing randomly with metric units, of course part of the secret British plan to confuse ''all'' foreign visitors. There's also some unofficial use in other countries, particularly Latin America, whose proximity to the USA means more prolific use of customary units; for example, where most metricated nations (such as those in Europe) use kilowatts and newtons-meter for power and torque, respectively, Latin American nations still use horsepower and pounds-foot, respectively. Car wheels (and inner dimensions of tires) are almost universally measured in inches. An abortive attempt was made to switch to metric in the early [[TheEighties '80s]]; as of the present, even Michelin, the driving force behind the move, no longer supplies tires to fit these sizes with Michelin-branded ones now made by antique reproduction specialists [[https://www.cokertire.com/ Coker Tire]] in low volume at prices just short of exorbitant. Tire sizes are actually a complicated mix of units, which is fine because almost nobody outside the automotive industry knows, much less cares about, what they mean -- the first number is in millimeters, the second a percentage (but may be millimeters), and the last in inches (but may also be millimeters). Fortunately, it's usually trivially obvious if the optional millimeter measurements are used, because the numbers will be much larger (around 23× as high for the second number, around ''25×'' as high for the last number).)

Incidentally, many folks like to say that the United States uses the Imperial Measurement System, [[YouKeepUsingThatWord which is not the same as American Customary Units]]. The Imperial units were standardized in 1824, [[UsefulNotes/TheAmericanRevolution well after the US stopped paying much heed to the British government's declarations]], while the United States customary units were based on the older British Units and standardized in the 1890s (the measurements now being defined by their Metric equivalents, as mentioned above). Both systems are close enough to the same for most day-to-day usage that most Americans don't know or care about the difference anyways.

The following is intended as a primer for non-Americans to whom the customary units of measurement may seem foreign, cryptic or simply hard to visualize. In modern times, most of these units are defined by their metric equivalents.

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!!Length and Area
The basic unit of length is the ''foot'' (30.48 centimeters), which is divided into twelve ''inches'' (2.54 centimeters each). When greater precision is required, fractions of an inch are used (generally based on powers of 2, such as 1⁄2, 1⁄4, 1⁄8, and so on), except in certain engineering disciplines which use decimal derivations. Feet and inches are commonly abbreviated by apostrophes (one for feet, two for inches -- e.g., 6 feet and 4 inches becomes 6'4"). Three feet make up a ''yard'' (91.44 centimeters ). On land, 5,280 feet (1,760 yards) make up a ''mile'' (~1.609 kilometers), whereas a ''nautical mile'' is around 6,076 feet (~1.852 kilometers, calibrated to equal a arc-minute of the Earth's latitude, hence its equal footing with metric units). 4,840 square yards (43,560 square feet) constitute an ''acre'' (~4,047 square meters, or just over 2⁄5 hectares).

Since 1959, the foot has been standardized to exactly 30.48cm. For historical compatibility, though, real estate maps are still drawn in the older ''survey foot'' (1200⁄3937 meters or 30.48006 centimeters).

Two smaller units, the ''point'' and the ''pica'', are used in graphic design and typesetting, and refer to 1⁄72 and 1⁄12 inch, respectively (~352.778 micrometers and 2.117 millimeters, respectively; by implication, six points equal a pica). Outside those fields, one is liable to run into points in the context of [[UsefulNotes/{{Fonts}} font]] sizes (though usage for font sizes on a computer screen is mostly traditional and will not usually reflect the actual physical size of a font -- technically, a 12-point font should render in the same physical size regardless of the physical size of the screen and screen resolution).

One notable exception is the automotive industry, which standardized on metric fasteners in the '80s, thus it's common to see both fractional-inch and metric sockets and wrenches in toolkits. Also, in some circles, lengths of less than a half-inch or so are given in millimeters because they're easier to work with; things like the tips on writing instruments and the width of photo film have been measured in millimeters for decades.

If you're in a harbor and looking at charts you better be absolutely certain that your charts are current and what units your charts use. If you aren't certain, mistaking fathoms for meters (or vice versa) means that your anchor chain is either too short to reach the bottom or about twice as long as what is needed. This can often be corrected through soundings. Local boat owners often don't to know how to take soundings but often know a lot more about how to sail a ship than either you or I will.

!!Mass
The basic unit of mass is the ''pound'' (453.59237 grams), which is further divided into sixteen ''ounces'' (~28.35 grams each)[[note]]Some will insist that the pound is actually a base unit of force (~4.448 newtons), equal to the measurement above multiplied by "standard gravity" (exactly 9.80665 meters per second per second), a uselessly overprecise estimate of gravity at sea level, and that the basic unit of mass is the ''slug'', one pound-force over a foot per second squared (14.59 kilograms.[[/note]]. The pound can be further divided into 7,000 ''grains'' (~64.8 milligrams each), though it is seldom used except in certain specialized fields, mostly archery and firearms. 2,000 pounds make a ''(short) ton'' (~907.18 kilograms).

A unit almost unheard-of in America, but still used in ordinary British conversation, is the ''stone'' (fourteen pounds, or ~6.35 kilograms); likewise, the ''imperial/long ton'' is defined as 2,240 pounds (~1,016 kilograms, slightly heavier than the ''metric tonne'' of 1,000 kilograms). This has to do with another archaic unit, the ''hundredweight'' -- whereas the American hundredweight was simplified to 100 pounds, the British version equaled eight stone (112 pounds), twenty of which form the imperial ton.

Those who deal with precious metals use instead a unit called ''troy pound'' (~373.2 grams), defined as 5,760 grains. The troy pound consists of twelve, rather than sixteen, ''troy ounces'' (~31.10 grams each). When one refers to both units, the standard ounce and pound are sometimes called ''ounce avoirdupois'' and ''pound avoirdupois'', respectively, to avoid confusion. [[note]]Hence, the answer to the children's riddle "Which weighs more, a pound of gold or a pound of feathers?" is not "Neither, both weigh a pound", but rather the pound of feathers, since the pound of gold is Troy while the pound of feathers is Avoirdupois (5760 grains < 7000 grains).[[/note]]

The pound is often abbreviated as "lb", from the Roman equivalent ''libra'' (which is also the source of the £ symbol).
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!!Volume
The basic unit of liquid volume is the ''gallon'' (~3.79 liters), defined as 231 cubic inches. A gallon is divided into four ''quarts'' (~946.35 milliliters each), which is divided into two ''pints'' (~473.18 milliliters each), divided in turn into two ''cups'' (~236.59 milliliters each), each divided ''again'' into eight ''fluid ounces'' (~29.57 milliliters each), not to be confused with the ounce discussed above (note, however, that a fluid ounce of a water-based liquid weighs close enough to an ounce avoirdupois for government work; hence the saying "A pint's a pound the world around," which turns a blind eye to every British part of the world).

For historical reasons, a few dry goods are sold using the dry volume system, whose basic measure is the ''(dry) quart'' (1.101220942715 liters), four of which create a ''(dry) gallon'' (~4.40488 liters); crops are typically sold by the ''bushel'' (8 dry gallons, or ~35.23907 liters) or ''peck'' (2 dry gallons, 1⁄4 bushel, or ~8.80977 liters) -- thus Peter Piper picked two dry gallons of pickled peppers. The Commonwealth, on the other hand, standardized the gallon, for both wet and dry goods, as exactly 4.54609 liters; the difference is that an ''imperial pint'' is twenty fluid ounces, as opposed to sixteen in the US version, so the counterpart to the "pint's a pound..." thing is an imperial gallon weighing ten pounds; the "cup" does not exist as a unit per se, and a Brit seeing "cups" in an American recipe is likely to think "but what ''size'' of cup?".

42 gallons equal a ''petroleum barrel'' (~158.99 liters), the standard international unit in which oil is sold, but other liquids sold in ''barrels'' typically that which measures 31.5 gallons each. ''Buttload'' is now used just to mean "a lot", but it used to be two ''hogsheads'' of 63 gallons each (~477.54 liters), used to measure wine.

Spaces you don't expect to fill with liquid (car trunks, apartments, warehouses, etc.) are expressed in ''cubic feet'' (~28,300 cubic centimeters).

Cooks use three additional units: the ''teaspoon'' (~4.929 milliliters), the ''tablespoon'' (3 tablespoons, 1⁄2 fluid ounce, or ~14.787 milliliters), and the ''kitchen cup'' (16 tablespoons, 8 fluid ounces, or 236.588 milliliters), which is slightly more voluminous than the fluid cup above. Two cups make a ''pint'' (~473.176 milliliters).

Ingredients in recipes are usually measured by volume, not weight (save meat and produce, which are bought by the pound). Most households do not possess a kitchen scale, thus these are generally priced only for the upscale or gourmet market, and can cost significantly more than an accurate measuring cup (e.g. 50¢ for a cup vs. $30+ for the cheapest scale at large chain houseware stores). Americans therefore tend to see British recipes as inaccessible and "only for snooty gourmets."

Prior to the early '70s, American automobile engines listed their displacement in cubic inches (The "409" that the Music/BeachBoys sung about was a car with a 409-cubic-inch engine). American cars have been built using metric measurements since then, when the energy crisis led to downsizing of engines, and it became preferable to advertisers to describe the size in liters rather than cubic inches. but since some cubic inch-based sizes are closely related to former performance they still pop up now and then. When Music/VanillaIce rapped about his "five-oh," he was referring to the 5.0l Mustang, which was a heavily redesigned "302" that is really closer to 4.9l. Small-block Chevrolet V8s are still closely associated with 350 c.i., although the company hasn't made one (or at least a 5.7l) in years.
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!!Temperature
The standard unit of temperature is the ''Fahrenheit'', where the boiling point of water at sea level is set at 212° and its freezing point at 32° -- a gap of exactly 180°, as intended by the unit's inventor and namesake, German physicist/engineer [[http://en.wikipedia.org/wiki/Daniel_Gabriel_Fahrenheit Daniel Gabriel Fahrenheit]], as it would make it easier to mark a rotary-gauge thermometer. As for 0°F, it is an arbitrary point, based on the approximate freezing point of seawater, then the lowest measurable temperature at the time the scale was developed.

The mean body temperature of a healthy adult is approximately 98°100°F (an oft-quoted figure of 98.6° is really just an overprecise conversion from 37°C). Temperatures less than 0° are colloquially spoken as "''X'' below [zero]"; thus, 10°F would be "ten below". The Fahrenheit and Celsius scales coincide at 40°, and absolute zero is exactly 459.67°F. To derive a Celsius temperature from a Fahrenheit reading, subtract 32 from it and divide by 1.8 (9⁄5); conversely, to derive Fahrenheit from Celsius, multiply the reading by 1.8 and then add 32.

There also exists the ''Rankine scale'', which is largely a historical curiosity at this point. Like the Kelvin scale, it starts at absolute zero and uses the same size degree as the Fahrenheit scale, so water freezes around 491.67° and boils at 671.64°.

American cookbooks specify temperatures exclusively in °F. Oven temperatures are always given in 25° increments, e.g. "Preheat oven to 425". The "gas mark" notation seen in British cookbooks is not used.
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!!Dates and Time
America almost exclusively uses the 12-hour clock, which is divided into two intervals -- "AM" (''ante meridiem'', before noon) and "PM" (''post meridiem'', after noon). "8 o'clock" therefore is not a specific enough time in certain circumstances, and would be clarified as "8 o'clock in the morning/evening." The 24-hour clock is mostly limited to the military, thus the sobriquet "military time". In the Army and Air Force, 18:00 would be called "eighteen hundred hours", whereas the Navy (and by extension, the Marine Corps) drops "hours" and would simply say "eighteen hundred". To a lesser extent, 24-hour time is used by professionals in round-the-clock industries, such as hospitals, transportation, and (increasingly) restaurants.

As to dates, they are written in the month/day/year format instead of the European day/month/year. December 20th, 2010 would be written as 12/20/2010, or just 12/20/10. This mimicks the way the date is written and said in full in English (unless you follow the "20 December" format), but it has the quirk of going back and forth in size, instead of being strictly hierarchical.
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!!Money
->''See the Useful Notes article on UsefulNotes/AmericanMoney, and the article on UsefulNotes/AmericanCurrency.''
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!!Energy
A few units of energy are in common use. The first and most basic is the ''foot-pound'', which, as the name suggests, is the amount of work done by one pound of force over one foot (~1.36 joules). Since nearly anyone who has a use for measurements of energy outside the following applications is primed on SI units, this is mostly used to give laymen and/or schoolchildren an intuitive idea of what energy and work are.

The second is the ''kilowatt-hour'' (~3.6 megajoules), mostly used by electric companies. Most Americans know what a watt is through electrical device ratings, so to make things more intuitive, power meters use this composite unit (the amount of energy used by a 1,000-watt appliance in an hour) instead of measuring things directly in joules.

The third is the ''calorie'' (~4.184 joules), used in heating, nutrition and kinesiology. An odd duck of sorts, the unit, based on the specific heat of water[[note]]The energy needed to heat 1 gram of water by 1°C; but since specific heat varies slightly with temperature and pressure, by the 1950s there were no less than ''four'' [[http://en.wikipedia.org/wiki/Calorie different "calories"]] measured at different temperatures, and several more defined through joules[[/note]]. It was introduced as a metric unit in 1824, and was later displaced by the joule -- but not before it found usage within the United States. The unit most Americans refer to when they say "calorie" -- the nutritional one, see below -- is actually the ''kilocalorie'' (formerly known as "large calorie").

There is also the ''British Thermal Unit'' (BTU), which is mainly used for things like specifying the amount of heat put out by furnaces. There are various definitions of the BTU, which range between 1,054-1,060 joules. To make things even more confusing to outsiders, American engineers measure cooling in tons (12,000 BTU per hour, equivalent to a ton of ice per day or ~3,516.85 watts) and heating in MBH (a thousand BTU per hour, or ~293.07 watts; the "M" is the Roman numeral for "1,000", not the expected million); both units are also technically measures of ''power'', not energy, but the BTU is an odd enough bird that it's better to keep everything together.
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!!Power
The common unit of power is the ''horsepower'', of which there are ''five'' variants, just to be even more confusing. The most common is ''mechanical horsepower'' (AKA ''brake horsepower'', from the method used to derive it), used by auto manufacturers to tell [[ViewersAreMorons the public]] that their car is more powerful, and is equivalent to 550 foot-pounds per second (~745.7 watts). There is also the ''metric horsepower'', ''electrical horsepower'', ''boiler horsepower'', and ''hydraulic horsepower'', all of which can be safely ignored, with the sole exception of the metric version, which is sometimes used to rate power outputs of automobiles and other engines in Europe, and always used for Japanese cars. The metric horsepower is sometimes called the ''Pferdestaerke'' (German for "horse strength"), and abbreviated "PS" or (rarely) "cv". The metric horsepower is slightly smaller than its American equivalent, at 735.49875 watts -- for instance, the old Japanese output limit of 280 PS for sports cars is around 276 BHP. You'll also hear references to "SAE net" or "gross" horsepower; specific to car engines, these terms have to do with the testing standard, not the units themselves. SAE gross horsepower, the standard for the auto industry until 1972 and still used in the trucking industry, is measured on a test stand in a pressurized room, with coolant and oil pumped through from outside sources so the engine doesn't have to spin its own pumps. In other words, rigged to give the highest number possible.

All that said, you're unlikely to see horsepower used outside of the automotive (and the propeller aviation and helicopter aviation) realm or certain kinds of electrical motors. As noted above, all electrical appliances in the US specify their rated consumption in watts (or the equivalent in volts and amperes), especially light bulbs and pretty much anything with a heating element in it. Ads for things electronic also tend to boast about how many watts they can output, especially high-power audio amplifiers and, sometimes, even the radio stations themselves.
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!!Force
Measured in ''pounds'', as stated above. Often expressed as "pounds of force", "lb-force", or "lbf" for disambiguation from the mass unit.
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!!Torque
Torque, or rotational force, is the cross-product of the measured linear force vector and the scalar radius at which it is measured. In conventional units, this is expressed in ''pounds-feet''. Most TV characters, and many real-life "car guys" who aren't engineers, will express it in foot-pounds. They're not completely wrong, but also not right. Actual engineers, like everywhere else, will use real units.
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!!Pressure
Air pressure is usually given in ''psi'', or pounds per square inch (~6.894 kilopascals). Atmospheric pressure is usually given in ''atmospheres'' or ''millimeters of mercury'' (760 mmHg = 1 atm = 101.325 kilopascals). Aviators still measure pressure in ''inches of mercury'' (29.92" = 1 atm), both for altimeter settings and engine manifold pressures. Televised weather reports on the news also commonly use inches of mercury for the barometric pressure.
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!!Food Labeling
As mentioned above, the food industry was one of the few to be legally required to use the metric system during the failed attempt at forced metrication, so food packaging is, outside school, the place where most Americans encounter the metric system. Since there are few laws regarding the use of metric units, different foods tend to use metric and customary units in different ways on packaging. Most of the time, either system will be indicated first, with its equivalent indicated thereafter in parentheses. Some examples are as follows:

Nutritional labels indicate energy content in kilocalories (confusingly, always labeled "Calories" -- note the capitalization; that's important), and amounts of other nutrients and additives in grams or milligrams. Vitamin content is typically indicated only as a percentage of the federally-recommended daily allotment. Since the format of nutritional labeling is set by the FDA, this is harmonious across all food products.

Dry and refrigerated packaged, canned, and frozen foods indicate net weight in ounces, followed by the metric equivalent in (parentheses).

Fresh meat, fish, and produce is always sold by the pound, and metric measurements are seldom indicated. (Cheese is also sometimes sold by the pound.)

Beverages sold in plastic bottles (soft drinks and most fruit juices) are labeled in liters for sizes 1 liter and up, or fluid ounces for smaller bottles, commonly at -- common sizes are 12, 16 or 20 fluid ounces, 450 milliliters, 0.5, 1, 1.5, 2, or (less commonly) 3 liters. Soft drinks less than 1 liter are either sold individually or in "six packs", "eight packs", "12-packs" or "24-packs", held together by a plastic spine called a yoke, by a plastic bag, or packed in cardboard.

Canned beverages are labeled in fluid ounces -- common sizes are 8, 10, 12, 18, or 24 fluid ounces. Juices and other more expensive beverages may have a little bit removed to save money, leading to 11.5-ounce juice cans. (Incidentally, twelve fluid ounces comes out to ~354.88 milliliters, but beverage canners almost always round that up to exactly 355.)

Beverages sold in cartons or polyurethane jugs (dairy products and some fruit juices) are sold by the gallon, half-gallon, or quart.

Prescription drugs, on the other hand, are labeled in metric units, because the amounts in question are usually so tiny as to render the conventional units meaningless, plus the fact that we're deep into scientist territory here. One may occasionally find a medicine bottle with weight indicated in grains, though they're today extremely rare.
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!!Drugs and Alcohol
Beer is generally sold in 6-packs, with 6 bottles or cans measuring 12 fl. oz. each. Some beers may be sold in loose bottles of larger sizes from 16 oz. (colloquially, a "tallboy") to 40 oz. (a "forty") Many bars often have pints available as well as pitchers for larger parties; glass mugs of approximately one liter are also fairly common, particularly in areas settled by people from southern Germany (e.g. the Upper Midwest). A pitcher of beer contains roughly 60 oz, or five bottles' worth. Some bars and restaurants specializing in beer will sell drafts in 20 oz "English" pints. Wine and spirits are typically sold in 750 mL bottles, 750 mL being the round metric number that most closely approximates the pre-metric bottle size of 1/5 gallon (a "fifth"). These bottles, as well as the half-size 375 mL bottles, are still colloquially referred to as pints and fifths despite their volume being slightly less than either. (These terms are more commonly used with spirits; many people just call 750 mL of wine a "bottle", though there are various archaic names for the larger sizes, including "Magnum" for a 1.5L, "Jeroboam" for a 3L, or "Methuselah" for a 6L, all the way up to the 30L "Melchizedek".) Spirits are also sold in 1.75 L bottles, which are colloquially called "handles" after the carrying handle such bottles usually have, or "half-gallons" or "half-g's" because they hold slightly less than half a gallon of spirits.

The alcoholic strength of spirits is described as a percentage of alcohol by volume, and, in the case of spirits, by "degrees proof", where 1 proof = 0.5% ABV. (Contrast British degrees proof, wherein 100 proof equals the point at which gunpowder moistened by the spirit is still capable of ignition, i.e. 57.15% a.b.v, or 114.3 American proof).

Marijuana is usually purchased in weights measuring 1/8th of an ounce, or it is measured in grams for smaller quantities. The same goes for "magic" psilocybin mushrooms. Cocaine is sold by the gram or 8-ball, which is 3.5 grams (just under 1/8 of an ounce hence the name). LSD can come in liquid form, measured in micrograms, or is sold on cardboard strips known as "blotters." Drugs like Ecstasy typically come in quarter-gram pills, which are sold individually (though the weight of active MDMA in the pill will be substantially lower than that). There's an old joke that "drugs are God's way of teaching Americans the metric system."

Note that since drugs like Marijuana[[note]]medical marijuana is legal at the State level in nineteen states, but is still illegal at the Federal level[[/note]], Cocaine, LSD, and Ecstacy are illegal, they are by definition sold on an unregulated black market. The only guarantee a buyer has for the weight and purity of a particular drug is the good faith of the seller.
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'''Abbreviations:''' The words are usually not spelled out, so here are the relevant abbreviations (and symbols):

* $: Dollars (confusingly, $ is also the abbreviation for Pesos in Mexico, which borders the U.S.). Appears ''before'' the number (except in Quebec).
** Doubly confusing, as some areas that operate with the US dollar (such as Puerto Rico or the Virgin Islands) may refer to the currency as a "peso".
* ¢: Cents. Appears ''after'' the number. Used instead of, not in addition to, the dollar sign, and only if an integer number of cents are specified (rather than a decimal value of dollars). Almost ''never'' used these days, as (thanks to inflation) most goods worth buying cost more than a dollar. Even as early as the 1960s, when computer character sets were becoming standardized, neither the ASCII nor the EBCDIC character set contained a cents sign (American computer keyboards replaced it with the caret, i.e, ^).
* fl oz: Fluid ounces
* ft or ': Feet
* hp or bhp: (Brake) horsepower
* in or ": Inches
* lb or #: Pounds (although # is dying as an abbreviation, it is occasionally used after a number to denote weight. 5# = 5lb. It's most commonly used by voicemail systems: "''Please enter'' [multi-digit number], ''followed by the pound sign''.")
* mi: Miles
** Except for mph (miles per hour)
*** Not to be confused with the metric "m" for "meter". [[note]]"meters per hour" is usually written as m/h... but "kilometers per hour" is usually kph.[[/note]]
* oz: Ounces
* yd: Yards

For those wondering, a hogshead is 63 U.S. liquid gallons, and a rod is 16.5 feet. 40 rods to a hogshead, as mentioned in the quote above, works out to approximately 120,000 liters per 100 km.
In miles per gallon that's statistical zero.[[note]] .002mpUSg[[/note]] A gas-guzzler even by American standards of [[TheNineties the quote's era]], then.
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<<|UsefulNotes/TheUnitedStates|>>

to:

-->''"The metric system is the tool of the devil! My car gets forty rods to the hogshead[[note]]About 0.002 MPG...about ten and a half feet. That's very, very, bad.[[/note]], and that's the way I likes it!"''\\
- Grandpa, ''TheSimpsons''

[[Music/SirMixALot 36-24-36. (Maybe, if she's 5'3".)]]

Whereas in most of the world [[TheMetricSystemIsHereToStay the metric system has come into near-universal use]] by ordinary citizens, the United States retains a non-decimal measurement system largely derived from traditional British units. Technically speaking, the federal government has observed the metric system since it ratified the Convention on the Meter in the late 19th century, and indeed, the units described below are now legally defined through their metric equivalents rather than their historical origins. The metric system is also almost universally used by the scientific community, though UnitConfusion has sometimes arisen when American and international teams each assumed one was using the other's units. To further complicate matters, the American engineering community has held on to customary units, resulting in occasional disconnects between builders and users of scientific equipment[[note]]For example, the loss of the Mars Climate Orbiter, popularly attributed to UnitConfusion, was actually due in large part to this sort of thing (specifically, a software error -- the thruster-control algorithms used force pounds, while the high-level software worked in newtons, a problem caused by lack of communication between NASA and its contractors and exacerbated by lack of proper testing).[[/note]]. What has come to be known as the "customary system", for lack of a better term, has continued in usage in for a number of factors, including tradition, national pride, and the expense of conversion.

An attempt by Congress to mandate metric conversion in [[TheSeventies the '70s]] failed primarily due to the last reason (and lack of political will). Only the bottling industry switched, but for other reasons -- Dr. Pepper advertised the small size gain from 2 quarts to 2 liters, and all other companies followed suit, which is why 2-liter bottles (and recently, 1-liter bottles) are in metric, but smaller units are in fluid ounces (which makes a [[Literature/NUMASeries Dirk Pitt]] novel look rather funny). It didn't ''hurt'' that the bottling industry wanted to switch from heavy, expensive and fragile glass to light, cheap and durable plastic bottles at just about that time; if you're going to be retooling everything ''anyway'', might as well make it count.

In Canada, Britain (the origin of the units) and other Anglophone countries, these units also enjoy non-official use (known as "Imperial measurements", after the British Empire), though their defining values may be slightly different; an ''imperial gallon'', for example, is about 1.2 American gallons. This is, combined with mixing randomly with metric units, of course part of the secret British plan to confuse ''all'' foreign visitors. There's also some unofficial use in other countries, particularly Latin America, whose proximity to the USA means more prolific use of customary units; for example, where most metricated nations (such as those in Europe) use kilowatts and newtons-meter for power and torque, respectively, Latin American nations still use horsepower and pounds-foot, respectively. Car wheels (and inner dimensions of tires) are almost universally measured in inches. An abortive attempt was made to switch to metric in the early [[TheEighties '80s]]; as of the present, even Michelin, the driving force behind the move, no longer supplies tires to fit these sizes with Michelin-branded ones now made by antique reproduction specialists [[https://www.cokertire.com/ Coker Tire]] in low volume at prices just short of exorbitant. Tire sizes are actually a complicated mix of units, which is fine because almost nobody outside the automotive industry knows, much less cares about, what they mean -- the first number is in millimeters, the second a percentage (but may be millimeters), and the last in inches (but may also be millimeters). Fortunately, it's usually trivially obvious if the optional millimeter measurements are used, because the numbers will be much larger (around 23× as high for the second number, around ''25×'' as high for the last number).)

Incidentally, many folks like to say that the United States uses the Imperial Measurement System, [[YouKeepUsingThatWord which is not the same as American Customary Units]]. The Imperial units were standardized in 1824, [[UsefulNotes/TheAmericanRevolution well after the US stopped paying much heed to the British government's declarations]], while the United States customary units were based on the older British Units and standardized in the 1890s (the measurements now being defined by their Metric equivalents, as mentioned above). Both systems are close enough to the same for most day-to-day usage that most Americans don't know or care about the difference anyways.

The following is intended as a primer for non-Americans to whom the customary units of measurement may seem foreign, cryptic or simply hard to visualize. In modern times, most of these units are defined by their metric equivalents.

----

!!Length and Area
The basic unit of length is the ''foot'' (30.48 centimeters), which is divided into twelve ''inches'' (2.54 centimeters each). When greater precision is required, fractions of an inch are used (generally based on powers of 2, such as 1⁄2, 1⁄4, 1⁄8, and so on), except in certain engineering disciplines which use decimal derivations. Feet and inches are commonly abbreviated by apostrophes (one for feet, two for inches -- e.g., 6 feet and 4 inches becomes 6'4"). Three feet make up a ''yard'' (91.44 centimeters ). On land, 5,280 feet (1,760 yards) make up a ''mile'' (~1.609 kilometers), whereas a ''nautical mile'' is around 6,076 feet (~1.852 kilometers, calibrated to equal a arc-minute of the Earth's latitude, hence its equal footing with metric units). 4,840 square yards (43,560 square feet) constitute an ''acre'' (~4,047 square meters, or just over 2⁄5 hectares).

Since 1959, the foot has been standardized to exactly 30.48cm. For historical compatibility, though, real estate maps are still drawn in the older ''survey foot'' (1200⁄3937 meters or 30.48006 centimeters).

Two smaller units, the ''point'' and the ''pica'', are used in graphic design and typesetting, and refer to 1⁄72 and 1⁄12 inch, respectively (~352.778 micrometers and 2.117 millimeters, respectively; by implication, six points equal a pica). Outside those fields, one is liable to run into points in the context of [[UsefulNotes/{{Fonts}} font]] sizes (though usage for font sizes on a computer screen is mostly traditional and will not usually reflect the actual physical size of a font -- technically, a 12-point font should render in the same physical size regardless of the physical size of the screen and screen resolution).

One notable exception is the automotive industry, which standardized on metric fasteners in the '80s, thus it's common to see both fractional-inch and metric sockets and wrenches in toolkits. Also, in some circles, lengths of less than a half-inch or so are given in millimeters because they're easier to work with; things like the tips on writing instruments and the width of photo film have been measured in millimeters for decades.

If you're in a harbor and looking at charts you better be absolutely certain that your charts are current and what units your charts use. If you aren't certain, mistaking fathoms for meters (or vice versa) means that your anchor chain is either too short to reach the bottom or about twice as long as what is needed. This can often be corrected through soundings. Local boat owners often don't to know how to take soundings but often know a lot more about how to sail a ship than either you or I will.

!!Mass
The basic unit of mass is the ''pound'' (453.59237 grams), which is further divided into sixteen ''ounces'' (~28.35 grams each)[[note]]Some will insist that the pound is actually a base unit of force (~4.448 newtons), equal to the measurement above multiplied by "standard gravity" (exactly 9.80665 meters per second per second), a uselessly overprecise estimate of gravity at sea level, and that the basic unit of mass is the ''slug'', one pound-force over a foot per second squared (14.59 kilograms.[[/note]]. The pound can be further divided into 7,000 ''grains'' (~64.8 milligrams each), though it is seldom used except in certain specialized fields, mostly archery and firearms. 2,000 pounds make a ''(short) ton'' (~907.18 kilograms).

A unit almost unheard-of in America, but still used in ordinary British conversation, is the ''stone'' (fourteen pounds, or ~6.35 kilograms); likewise, the ''imperial/long ton'' is defined as 2,240 pounds (~1,016 kilograms, slightly heavier than the ''metric tonne'' of 1,000 kilograms). This has to do with another archaic unit, the ''hundredweight'' -- whereas the American hundredweight was simplified to 100 pounds, the British version equaled eight stone (112 pounds), twenty of which form the imperial ton.

Those who deal with precious metals use instead a unit called ''troy pound'' (~373.2 grams), defined as 5,760 grains. The troy pound consists of twelve, rather than sixteen, ''troy ounces'' (~31.10 grams each). When one refers to both units, the standard ounce and pound are sometimes called ''ounce avoirdupois'' and ''pound avoirdupois'', respectively, to avoid confusion. [[note]]Hence, the answer to the children's riddle "Which weighs more, a pound of gold or a pound of feathers?" is not "Neither, both weigh a pound", but rather the pound of feathers, since the pound of gold is Troy while the pound of feathers is Avoirdupois (5760 grains < 7000 grains).[[/note]]

The pound is often abbreviated as "lb", from the Roman equivalent ''libra'' (which is also the source of the £ symbol).
----

!!Volume
The basic unit of liquid volume is the ''gallon'' (~3.79 liters), defined as 231 cubic inches. A gallon is divided into four ''quarts'' (~946.35 milliliters each), which is divided into two ''pints'' (~473.18 milliliters each), divided in turn into two ''cups'' (~236.59 milliliters each), each divided ''again'' into eight ''fluid ounces'' (~29.57 milliliters each), not to be confused with the ounce discussed above (note, however, that a fluid ounce of a water-based liquid weighs close enough to an ounce avoirdupois for government work; hence the saying "A pint's a pound the world around," which turns a blind eye to every British part of the world).

For historical reasons, a few dry goods are sold using the dry volume system, whose basic measure is the ''(dry) quart'' (1.101220942715 liters), four of which create a ''(dry) gallon'' (~4.40488 liters); crops are typically sold by the ''bushel'' (8 dry gallons, or ~35.23907 liters) or ''peck'' (2 dry gallons, 1⁄4 bushel, or ~8.80977 liters) -- thus Peter Piper picked two dry gallons of pickled peppers. The Commonwealth, on the other hand, standardized the gallon, for both wet and dry goods, as exactly 4.54609 liters; the difference is that an ''imperial pint'' is twenty fluid ounces, as opposed to sixteen in the US version, so the counterpart to the "pint's a pound..." thing is an imperial gallon weighing ten pounds; the "cup" does not exist as a unit per se, and a Brit seeing "cups" in an American recipe is likely to think "but what ''size'' of cup?".

42 gallons equal a ''petroleum barrel'' (~158.99 liters), the standard international unit in which oil is sold, but other liquids sold in ''barrels'' typically that which measures 31.5 gallons each. ''Buttload'' is now used just to mean "a lot", but it used to be two ''hogsheads'' of 63 gallons each (~477.54 liters), used to measure wine.

Spaces you don't expect to fill with liquid (car trunks, apartments, warehouses, etc.) are expressed in ''cubic feet'' (~28,300 cubic centimeters).

Cooks use three additional units: the ''teaspoon'' (~4.929 milliliters), the ''tablespoon'' (3 tablespoons, 1⁄2 fluid ounce, or ~14.787 milliliters), and the ''kitchen cup'' (16 tablespoons, 8 fluid ounces, or 236.588 milliliters), which is slightly more voluminous than the fluid cup above. Two cups make a ''pint'' (~473.176 milliliters).

Ingredients in recipes are usually measured by volume, not weight (save meat and produce, which are bought by the pound). Most households do not possess a kitchen scale, thus these are generally priced only for the upscale or gourmet market, and can cost significantly more than an accurate measuring cup (e.g. 50¢ for a cup vs. $30+ for the cheapest scale at large chain houseware stores). Americans therefore tend to see British recipes as inaccessible and "only for snooty gourmets."

Prior to the early '70s, American automobile engines listed their displacement in cubic inches (The "409" that the Music/BeachBoys sung about was a car with a 409-cubic-inch engine). American cars have been built using metric measurements since then, when the energy crisis led to downsizing of engines, and it became preferable to advertisers to describe the size in liters rather than cubic inches. but since some cubic inch-based sizes are closely related to former performance they still pop up now and then. When Music/VanillaIce rapped about his "five-oh," he was referring to the 5.0l Mustang, which was a heavily redesigned "302" that is really closer to 4.9l. Small-block Chevrolet V8s are still closely associated with 350 c.i., although the company hasn't made one (or at least a 5.7l) in years.
----

!!Temperature
The standard unit of temperature is the ''Fahrenheit'', where the boiling point of water at sea level is set at 212° and its freezing point at 32° -- a gap of exactly 180°, as intended by the unit's inventor and namesake, German physicist/engineer [[http://en.wikipedia.org/wiki/Daniel_Gabriel_Fahrenheit Daniel Gabriel Fahrenheit]], as it would make it easier to mark a rotary-gauge thermometer. As for 0°F, it is an arbitrary point, based on the approximate freezing point of seawater, then the lowest measurable temperature at the time the scale was developed.

The mean body temperature of a healthy adult is approximately 98°100°F (an oft-quoted figure of 98.6° is really just an overprecise conversion from 37°C). Temperatures less than 0° are colloquially spoken as "''X'' below [zero]"; thus, 10°F would be "ten below". The Fahrenheit and Celsius scales coincide at 40°, and absolute zero is exactly 459.67°F. To derive a Celsius temperature from a Fahrenheit reading, subtract 32 from it and divide by 1.8 (9⁄5); conversely, to derive Fahrenheit from Celsius, multiply the reading by 1.8 and then add 32.

There also exists the ''Rankine scale'', which is largely a historical curiosity at this point. Like the Kelvin scale, it starts at absolute zero and uses the same size degree as the Fahrenheit scale, so water freezes around 491.67° and boils at 671.64°.

American cookbooks specify temperatures exclusively in °F. Oven temperatures are always given in 25° increments, e.g. "Preheat oven to 425". The "gas mark" notation seen in British cookbooks is not used.
----

!!Dates and Time
America almost exclusively uses the 12-hour clock, which is divided into two intervals -- "AM" (''ante meridiem'', before noon) and "PM" (''post meridiem'', after noon). "8 o'clock" therefore is not a specific enough time in certain circumstances, and would be clarified as "8 o'clock in the morning/evening." The 24-hour clock is mostly limited to the military, thus the sobriquet "military time". In the Army and Air Force, 18:00 would be called "eighteen hundred hours", whereas the Navy (and by extension, the Marine Corps) drops "hours" and would simply say "eighteen hundred". To a lesser extent, 24-hour time is used by professionals in round-the-clock industries, such as hospitals, transportation, and (increasingly) restaurants.

As to dates, they are written in the month/day/year format instead of the European day/month/year. December 20th, 2010 would be written as 12/20/2010, or just 12/20/10. This mimicks the way the date is written and said in full in English (unless you follow the "20 December" format), but it has the quirk of going back and forth in size, instead of being strictly hierarchical.
----

!!Money
->''See the Useful Notes article on UsefulNotes/AmericanMoney, and the article on UsefulNotes/AmericanCurrency.''
----

!!Energy
A few units of energy are in common use. The first and most basic is the ''foot-pound'', which, as the name suggests, is the amount of work done by one pound of force over one foot (~1.36 joules). Since nearly anyone who has a use for measurements of energy outside the following applications is primed on SI units, this is mostly used to give laymen and/or schoolchildren an intuitive idea of what energy and work are.

The second is the ''kilowatt-hour'' (~3.6 megajoules), mostly used by electric companies. Most Americans know what a watt is through electrical device ratings, so to make things more intuitive, power meters use this composite unit (the amount of energy used by a 1,000-watt appliance in an hour) instead of measuring things directly in joules.

The third is the ''calorie'' (~4.184 joules), used in heating, nutrition and kinesiology. An odd duck of sorts, the unit, based on the specific heat of water[[note]]The energy needed to heat 1 gram of water by 1°C; but since specific heat varies slightly with temperature and pressure, by the 1950s there were no less than ''four'' [[http://en.wikipedia.org/wiki/Calorie different "calories"]] measured at different temperatures, and several more defined through joules[[/note]]. It was introduced as a metric unit in 1824, and was later displaced by the joule -- but not before it found usage within the United States. The unit most Americans refer to when they say "calorie" -- the nutritional one, see below -- is actually the ''kilocalorie'' (formerly known as "large calorie").

There is also the ''British Thermal Unit'' (BTU), which is mainly used for things like specifying the amount of heat put out by furnaces. There are various definitions of the BTU, which range between 1,054-1,060 joules. To make things even more confusing to outsiders, American engineers measure cooling in tons (12,000 BTU per hour, equivalent to a ton of ice per day or ~3,516.85 watts) and heating in MBH (a thousand BTU per hour, or ~293.07 watts; the "M" is the Roman numeral for "1,000", not the expected million); both units are also technically measures of ''power'', not energy, but the BTU is an odd enough bird that it's better to keep everything together.
----

!!Power
The common unit of power is the ''horsepower'', of which there are ''five'' variants, just to be even more confusing. The most common is ''mechanical horsepower'' (AKA ''brake horsepower'', from the method used to derive it), used by auto manufacturers to tell [[ViewersAreMorons the public]] that their car is more powerful, and is equivalent to 550 foot-pounds per second (~745.7 watts). There is also the ''metric horsepower'', ''electrical horsepower'', ''boiler horsepower'', and ''hydraulic horsepower'', all of which can be safely ignored, with the sole exception of the metric version, which is sometimes used to rate power outputs of automobiles and other engines in Europe, and always used for Japanese cars. The metric horsepower is sometimes called the ''Pferdestaerke'' (German for "horse strength"), and abbreviated "PS" or (rarely) "cv". The metric horsepower is slightly smaller than its American equivalent, at 735.49875 watts -- for instance, the old Japanese output limit of 280 PS for sports cars is around 276 BHP. You'll also hear references to "SAE net" or "gross" horsepower; specific to car engines, these terms have to do with the testing standard, not the units themselves. SAE gross horsepower, the standard for the auto industry until 1972 and still used in the trucking industry, is measured on a test stand in a pressurized room, with coolant and oil pumped through from outside sources so the engine doesn't have to spin its own pumps. In other words, rigged to give the highest number possible.

All that said, you're unlikely to see horsepower used outside of the automotive (and the propeller aviation and helicopter aviation) realm or certain kinds of electrical motors. As noted above, all electrical appliances in the US specify their rated consumption in watts (or the equivalent in volts and amperes), especially light bulbs and pretty much anything with a heating element in it. Ads for things electronic also tend to boast about how many watts they can output, especially high-power audio amplifiers and, sometimes, even the radio stations themselves.
----

!!Force
Measured in ''pounds'', as stated above. Often expressed as "pounds of force", "lb-force", or "lbf" for disambiguation from the mass unit.
----

!!Torque
Torque, or rotational force, is the cross-product of the measured linear force vector and the scalar radius at which it is measured. In conventional units, this is expressed in ''pounds-feet''. Most TV characters, and many real-life "car guys" who aren't engineers, will express it in foot-pounds. They're not completely wrong, but also not right. Actual engineers, like everywhere else, will use real units.
----

!!Pressure
Air pressure is usually given in ''psi'', or pounds per square inch (~6.894 kilopascals). Atmospheric pressure is usually given in ''atmospheres'' or ''millimeters of mercury'' (760 mmHg = 1 atm = 101.325 kilopascals). Aviators still measure pressure in ''inches of mercury'' (29.92" = 1 atm), both for altimeter settings and engine manifold pressures. Televised weather reports on the news also commonly use inches of mercury for the barometric pressure.
----

!!Food Labeling
As mentioned above, the food industry was one of the few to be legally required to use the metric system during the failed attempt at forced metrication, so food packaging is, outside school, the place where most Americans encounter the metric system. Since there are few laws regarding the use of metric units, different foods tend to use metric and customary units in different ways on packaging. Most of the time, either system will be indicated first, with its equivalent indicated thereafter in parentheses. Some examples are as follows:

Nutritional labels indicate energy content in kilocalories (confusingly, always labeled "Calories" -- note the capitalization; that's important), and amounts of other nutrients and additives in grams or milligrams. Vitamin content is typically indicated only as a percentage of the federally-recommended daily allotment. Since the format of nutritional labeling is set by the FDA, this is harmonious across all food products.

Dry and refrigerated packaged, canned, and frozen foods indicate net weight in ounces, followed by the metric equivalent in (parentheses).

Fresh meat, fish, and produce is always sold by the pound, and metric measurements are seldom indicated. (Cheese is also sometimes sold by the pound.)

Beverages sold in plastic bottles (soft drinks and most fruit juices) are labeled in liters for sizes 1 liter and up, or fluid ounces for smaller bottles, commonly at -- common sizes are 12, 16 or 20 fluid ounces, 450 milliliters, 0.5, 1, 1.5, 2, or (less commonly) 3 liters. Soft drinks less than 1 liter are either sold individually or in "six packs", "eight packs", "12-packs" or "24-packs", held together by a plastic spine called a yoke, by a plastic bag, or packed in cardboard.

Canned beverages are labeled in fluid ounces -- common sizes are 8, 10, 12, 18, or 24 fluid ounces. Juices and other more expensive beverages may have a little bit removed to save money, leading to 11.5-ounce juice cans. (Incidentally, twelve fluid ounces comes out to ~354.88 milliliters, but beverage canners almost always round that up to exactly 355.)

Beverages sold in cartons or polyurethane jugs (dairy products and some fruit juices) are sold by the gallon, half-gallon, or quart.

Prescription drugs, on the other hand, are labeled in metric units, because the amounts in question are usually so tiny as to render the conventional units meaningless, plus the fact that we're deep into scientist territory here. One may occasionally find a medicine bottle with weight indicated in grains, though they're today extremely rare.
----

!!Drugs and Alcohol
Beer is generally sold in 6-packs, with 6 bottles or cans measuring 12 fl. oz. each. Some beers may be sold in loose bottles of larger sizes from 16 oz. (colloquially, a "tallboy") to 40 oz. (a "forty") Many bars often have pints available as well as pitchers for larger parties; glass mugs of approximately one liter are also fairly common, particularly in areas settled by people from southern Germany (e.g. the Upper Midwest). A pitcher of beer contains roughly 60 oz, or five bottles' worth. Some bars and restaurants specializing in beer will sell drafts in 20 oz "English" pints. Wine and spirits are typically sold in 750 mL bottles, 750 mL being the round metric number that most closely approximates the pre-metric bottle size of 1/5 gallon (a "fifth"). These bottles, as well as the half-size 375 mL bottles, are still colloquially referred to as pints and fifths despite their volume being slightly less than either. (These terms are more commonly used with spirits; many people just call 750 mL of wine a "bottle", though there are various archaic names for the larger sizes, including "Magnum" for a 1.5L, "Jeroboam" for a 3L, or "Methuselah" for a 6L, all the way up to the 30L "Melchizedek".) Spirits are also sold in 1.75 L bottles, which are colloquially called "handles" after the carrying handle such bottles usually have, or "half-gallons" or "half-g's" because they hold slightly less than half a gallon of spirits.

The alcoholic strength of spirits is described as a percentage of alcohol by volume, and, in the case of spirits, by "degrees proof", where 1 proof = 0.5% ABV. (Contrast British degrees proof, wherein 100 proof equals the point at which gunpowder moistened by the spirit is still capable of ignition, i.e. 57.15% a.b.v, or 114.3 American proof).

Marijuana is usually purchased in weights measuring 1/8th of an ounce, or it is measured in grams for smaller quantities. The same goes for "magic" psilocybin mushrooms. Cocaine is sold by the gram or 8-ball, which is 3.5 grams (just under 1/8 of an ounce hence the name). LSD can come in liquid form, measured in micrograms, or is sold on cardboard strips known as "blotters." Drugs like Ecstasy typically come in quarter-gram pills, which are sold individually (though the weight of active MDMA in the pill will be substantially lower than that). There's an old joke that "drugs are God's way of teaching Americans the metric system."

Note that since drugs like Marijuana[[note]]medical marijuana is legal at the State level in nineteen states, but is still illegal at the Federal level[[/note]], Cocaine, LSD, and Ecstacy are illegal, they are by definition sold on an unregulated black market. The only guarantee a buyer has for the weight and purity of a particular drug is the good faith of the seller.
----

'''Abbreviations:''' The words are usually not spelled out, so here are the relevant abbreviations (and symbols):

* $: Dollars (confusingly, $ is also the abbreviation for Pesos in Mexico, which borders the U.S.). Appears ''before'' the number (except in Quebec).
** Doubly confusing, as some areas that operate with the US dollar (such as Puerto Rico or the Virgin Islands) may refer to the currency as a "peso".
* ¢: Cents. Appears ''after'' the number. Used instead of, not in addition to, the dollar sign, and only if an integer number of cents are specified (rather than a decimal value of dollars). Almost ''never'' used these days, as (thanks to inflation) most goods worth buying cost more than a dollar. Even as early as the 1960s, when computer character sets were becoming standardized, neither the ASCII nor the EBCDIC character set contained a cents sign (American computer keyboards replaced it with the caret, i.e, ^).
* fl oz: Fluid ounces
* ft or ': Feet
* hp or bhp: (Brake) horsepower
* in or ": Inches
* lb or #: Pounds (although # is dying as an abbreviation, it is occasionally used after a number to denote weight. 5# = 5lb. It's most commonly used by voicemail systems: "''Please enter'' [multi-digit number], ''followed by the pound sign''.")
* mi: Miles
** Except for mph (miles per hour)
*** Not to be confused with the metric "m" for "meter". [[note]]"meters per hour" is usually written as m/h... but "kilometers per hour" is usually kph.[[/note]]
* oz: Ounces
* yd: Yards

For those wondering, a hogshead is 63 U.S. liquid gallons, and a rod is 16.5 feet. 40 rods to a hogshead, as mentioned in the quote above, works out to approximately 120,000 liters per 100 km.
In miles per gallon that's statistical zero.[[note]] .002mpUSg[[/note]] A gas-guzzler even by American standards of [[TheNineties the quote's era]], then.
----
<<|UsefulNotes/TheUnitedStates|>>
[[redirect:UsefulNotes/AmericanCustomaryMeasurements]]
8th Jun '15 10:38:45 AM BillWoods
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In Canada, Britain (the origin of the units) and other Anglophone countries, these units also enjoy non-official use (known as "Imperial measurements", after the British Empire), though their defining values may be slightly different; an ''imperial gallon'', for example, is about 1.2 American gallons. This is, combined with mixing randomly with metric units, of course part of the secret British plan to confuse ''all'' foreign visitors. There's also some unofficial use in other countries, particularly Latin America, whose proximity to the USA means more prolific use of customary units; for example, where most metricated nations (such as those in Europe) use kilowatts and newtons-meter for power and torque, respectively, Latin American nations still use horsepower and pounds-foot, respectively. Car wheels (and inner dimensions of tires) are almost universally measured in inches. An abortive attempt was made to switch to metric in the early [[TheEighties '80s]]; as of the present, even Michelin, the driving force behind the move, no longer supplies tires to fit these sizes with Michelin-branded ones now made by antique reproduction specialists [[https://www.cokertire.com/ Coker Tire]] in low volume at prices just short of exorbitant. Tire sizes are actually a complicated mix of units, which is fine because almost nobody outside the automotive industry knows, much less cares about, what they mean -- the first number is in millimeters, the second a percentage (but may be millimeters), and the last in inches (but may also be millimeters). Fortunately, it's usually trivially obvious if the optional millimeter measurements are used, because the numbers will be much larger (around 2-3× as high for the second number, around ''25×'' as high for the last number).)

to:

In Canada, Britain (the origin of the units) and other Anglophone countries, these units also enjoy non-official use (known as "Imperial measurements", after the British Empire), though their defining values may be slightly different; an ''imperial gallon'', for example, is about 1.2 American gallons. This is, combined with mixing randomly with metric units, of course part of the secret British plan to confuse ''all'' foreign visitors. There's also some unofficial use in other countries, particularly Latin America, whose proximity to the USA means more prolific use of customary units; for example, where most metricated nations (such as those in Europe) use kilowatts and newtons-meter for power and torque, respectively, Latin American nations still use horsepower and pounds-foot, respectively. Car wheels (and inner dimensions of tires) are almost universally measured in inches. An abortive attempt was made to switch to metric in the early [[TheEighties '80s]]; as of the present, even Michelin, the driving force behind the move, no longer supplies tires to fit these sizes with Michelin-branded ones now made by antique reproduction specialists [[https://www.cokertire.com/ Coker Tire]] in low volume at prices just short of exorbitant. Tire sizes are actually a complicated mix of units, which is fine because almost nobody outside the automotive industry knows, much less cares about, what they mean -- the first number is in millimeters, the second a percentage (but may be millimeters), and the last in inches (but may also be millimeters). Fortunately, it's usually trivially obvious if the optional millimeter measurements are used, because the numbers will be much larger (around 2-3× 23× as high for the second number, around ''25×'' as high for the last number).)



One notable exception is the automotive industry, which standardized on metric fasteners in the 80s, thus it's common to see both fractional-inch and metric sockets and wrenches in toolkits. Also, in some circles, lengths of less than a half-inch or so are given in millimeters because they're easier to work with; things like the tips on writing instruments and the width of photo film have been measured in millimeters for decades.

to:

One notable exception is the automotive industry, which standardized on metric fasteners in the 80s, '80s, thus it's common to see both fractional-inch and metric sockets and wrenches in toolkits. Also, in some circles, lengths of less than a half-inch or so are given in millimeters because they're easier to work with; things like the tips on writing instruments and the width of photo film have been measured in millimeters for decades.



Prior to the early 70s, American automobile engines listed their displacement in cubic inches (The "409" that the Music/BeachBoys sung about was a car with a 409-cubic-inch engine). American cars have been built using metric measurements since then, when the energy crisis led to downsizing of engines, and it became preferable to advertisers to describe the size in liters rather than cubic inches. but since some cubic inch-based sizes are closely related to former performance they still pop up now and then. When Music/VanillaIce rapped about his "five-oh," he was referring to the 5.0l Mustang, which was a heavily redesigned "302" that is really closer to 4.9l. Small-block Chevrolet V8s are still closely associated with 350 c.i., although the company hasn't made one (or at least a 5.7l) in years.

to:

Prior to the early 70s, '70s, American automobile engines listed their displacement in cubic inches (The "409" that the Music/BeachBoys sung about was a car with a 409-cubic-inch engine). American cars have been built using metric measurements since then, when the energy crisis led to downsizing of engines, and it became preferable to advertisers to describe the size in liters rather than cubic inches. but since some cubic inch-based sizes are closely related to former performance they still pop up now and then. When Music/VanillaIce rapped about his "five-oh," he was referring to the 5.0l Mustang, which was a heavily redesigned "302" that is really closer to 4.9l. Small-block Chevrolet V8s are still closely associated with 350 c.i., although the company hasn't made one (or at least a 5.7l) in years.



The mean body temperature of a healthy adult is approximately 98°-100°F (an oft-quoted figure of 98.6° is really just an overprecise conversion from 37°C). Temperatures less than 0° are colloquially spoken as "''X'' below"; thus, -10°F would be "ten below". The Fahrenheit and Celsius scales coincide at -40°, and absolute zero is exactly -459.67°F. To derive a Celsius temperature from a Fahrenheit reading, subtract 32 from it and divide by 1.8 (9⁄5); conversely, to derive Fahrenheit from Celsius, multiply the reading by 1.8 and then add 32.

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The mean body temperature of a healthy adult is approximately 98°-100°F 98°100°F (an oft-quoted figure of 98.6° is really just an overprecise conversion from 37°C). Temperatures less than 0° are colloquially spoken as "''X'' below"; below [zero]"; thus, -10°F 10°F would be "ten below". The Fahrenheit and Celsius scales coincide at -40°, 40°, and absolute zero is exactly -459.459.67°F. To derive a Celsius temperature from a Fahrenheit reading, subtract 32 from it and divide by 1.8 (9⁄5); conversely, to derive Fahrenheit from Celsius, multiply the reading by 1.8 and then add 32.



As to dates, they are written in the month/day/year format instead of the European day/month/year. December 20th, 2010 would be written as 12/20/2010, or just 12/20/10. This has the quirk of mimicking the way the date is written and said in full in English (unless you follow the "20 December" format), but it goes back and forth instead of being strictly hierarchical.

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As to dates, they are written in the month/day/year format instead of the European day/month/year. December 20th, 2010 would be written as 12/20/2010, or just 12/20/10. This has the quirk of mimicking mimicks the way the date is written and said in full in English (unless you follow the "20 December" format), but it goes has the quirk of going back and forth in size, instead of being strictly hierarchical.



Beverages sold in plastic bottles (softdrinks and most fruit juices) are labeled in liters for sizes 1 liter and up, or fluid ounces for smaller bottles, commonly at -- common sizes are 12, 16 or 20 fluid ounces, 450 milliliters, 0.5, 1, 1.5, 2, or (less commonly) 3 liters. Softdrinks less than 1 liter are either sold individually or in "six packs", "eight packs", "12-packs" or "24-packs", held together by a plastic spine called a yoke, by a plastic bag, or packed in cardboard.

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Beverages sold in plastic bottles (softdrinks (soft drinks and most fruit juices) are labeled in liters for sizes 1 liter and up, or fluid ounces for smaller bottles, commonly at -- common sizes are 12, 16 or 20 fluid ounces, 450 milliliters, 0.5, 1, 1.5, 2, or (less commonly) 3 liters. Softdrinks Soft drinks less than 1 liter are either sold individually or in "six packs", "eight packs", "12-packs" or "24-packs", held together by a plastic spine called a yoke, by a plastic bag, or packed in cardboard.



Beverages sold in cartons or polyurethane jugs (dairy products and some fruit juices) are sold by the gallon, half-gallon, or quart. Milk often comes in Quarts, Half Gallons and Gallons,

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Beverages sold in cartons or polyurethane jugs (dairy products and some fruit juices) are sold by the gallon, half-gallon, or quart. Milk often comes in Quarts, Half Gallons and Gallons,
quart.



* lb or #: Pounds (although # is dying as an abbreviation, it is occasionally used after a number to denote weight. 5# = 5lb.)

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* lb or #: Pounds (although # is dying as an abbreviation, it is occasionally used after a number to denote weight. 5# = 5lb.) It's most commonly used by voicemail systems: "''Please enter'' [multi-digit number], ''followed by the pound sign''.")
6th Apr '15 7:39:39 AM NemuruMaeNi
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Beer is generally sold in 6-packs, with 6 bottles or cans measuring 12 fl. oz. each. Some beers may be sold in loose bottles of larger sizes from 16 oz. (colloquially, a "tallboy") to 40 oz. (a "forty") Many bars often have pints available as well as pitchers for larger parties; glass mugs of approximately one liter are also fairly common, particularly in areas settled by people from southern Germany (e.g. the Upper Midwest). A pitcher of beer contains roughly 60 oz, or five bottles' worth. Some bars and restaurants specializing in beer will sell drafts in 20 oz "English" pints. Wine and spirits are typically sold in 750 mL bottles, 750 mL being the round metric number that most closely approximates the pre-metric bottle size of 1/5 gallon (a "fifth"). These bottles, as well as the half-size 375 mL bottles, are still colloquially referred to as pints and fifths despite their volume being slightly less than either. (These terms are more commonly used with spirits; many people just call 750 mL of wine a "bottle", though there are various archaic names for the larger sizes, including "Magnum" for a 1.5L, "Jeroboam" for a 3L, or "Methuselah" for a 6L, all the way up to the 30L "Melchizedek".) Spirits are also sold in 1.75 L bottles, which are colloquially called "handles" after [[ExactlyWhatItSaysOnTheTin the carrying handle such bottles usually have]], or "half-gallons" or "half-g's" because they hold slightly less than half a gallon of spirits.

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Beer is generally sold in 6-packs, with 6 bottles or cans measuring 12 fl. oz. each. Some beers may be sold in loose bottles of larger sizes from 16 oz. (colloquially, a "tallboy") to 40 oz. (a "forty") Many bars often have pints available as well as pitchers for larger parties; glass mugs of approximately one liter are also fairly common, particularly in areas settled by people from southern Germany (e.g. the Upper Midwest). A pitcher of beer contains roughly 60 oz, or five bottles' worth. Some bars and restaurants specializing in beer will sell drafts in 20 oz "English" pints. Wine and spirits are typically sold in 750 mL bottles, 750 mL being the round metric number that most closely approximates the pre-metric bottle size of 1/5 gallon (a "fifth"). These bottles, as well as the half-size 375 mL bottles, are still colloquially referred to as pints and fifths despite their volume being slightly less than either. (These terms are more commonly used with spirits; many people just call 750 mL of wine a "bottle", though there are various archaic names for the larger sizes, including "Magnum" for a 1.5L, "Jeroboam" for a 3L, or "Methuselah" for a 6L, all the way up to the 30L "Melchizedek".) Spirits are also sold in 1.75 L bottles, which are colloquially called "handles" after [[ExactlyWhatItSaysOnTheTin the carrying handle such bottles usually have]], have, or "half-gallons" or "half-g's" because they hold slightly less than half a gallon of spirits.
3rd Oct '14 7:27:23 AM TheOneWhoTropes
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->''See the Useful Notes article on UsefulNotes/AmericanMoney, and the article on AmericanCurrency.''

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->''See the Useful Notes article on UsefulNotes/AmericanMoney, and the article on AmericanCurrency.UsefulNotes/AmericanCurrency.''
26th Aug '14 1:12:57 PM MrBadAxe
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Those who deal with precious metals use instead a unit called ''troy pound'' (~373.2 grams), defined as 5,760 grains. The troy pound consists of twelve, rather than sixteen, ''troy ounces'' (~31.10 grams each). When one refers to both units, the standard ounce and pound are sometimes called ''ounce avoirdupois'' and ''pound avoirdupois'', respectively, to avoid confusion. The pound is often abbreviated as "lb", from the Roman equivalent ''libra'' (which is also the source of the £ symbol).

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Those who deal with precious metals use instead a unit called ''troy pound'' (~373.2 grams), defined as 5,760 grains. The troy pound consists of twelve, rather than sixteen, ''troy ounces'' (~31.10 grams each). When one refers to both units, the standard ounce and pound are sometimes called ''ounce avoirdupois'' and ''pound avoirdupois'', respectively, to avoid confusion. [[note]]Hence, the answer to the children's riddle "Which weighs more, a pound of gold or a pound of feathers?" is not "Neither, both weigh a pound", but rather the pound of feathers, since the pound of gold is Troy while the pound of feathers is Avoirdupois (5760 grains < 7000 grains).[[/note]]

The pound is often abbreviated as "lb", from the Roman equivalent ''libra'' (which is also the source of the £ symbol).
8th Aug '14 8:41:43 PM AFP
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Added DiffLines:

Incidentally, many folks like to say that the United States uses the Imperial Measurement System, [[YouKeepUsingThatWord which is not the same as American Customary Units]]. The Imperial units were standardized in 1824, [[UsefulNotes/TheAmericanRevolution well after the US stopped paying much heed to the British government's declarations]], while the United States customary units were based on the older British Units and standardized in the 1890s (the measurements now being defined by their Metric equivalents, as mentioned above). Both systems are close enough to the same for most day-to-day usage that most Americans don't know or care about the difference anyways.


Added DiffLines:

7th Jul '14 10:23:58 PM kouta
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----

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----

If you're in a harbor and looking at charts you better be absolutely certain that your charts are current and what units your charts use. If you aren't certain, mistaking fathoms for meters (or vice versa) means that your anchor chain is either too short to reach the bottom or about twice as long as what is needed. This can often be corrected through soundings. Local boat owners often don't to know how to take soundings but often know a lot more about how to sail a ship than either you or I will.
14th May '14 8:18:52 AM zero5889
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The basic unit of length is the ''foot'' (30.48 centimeters), which is divided into 12 ''inches'' (2.54 centimeters each). When greater precision is required, fractions of an inch are used (generally based on powers of 2, such as 1⁄2, 1⁄4, 1⁄8, etc.), except in certain engineering disciplines which use decimals. Feet and inches are commonly abbreviated by apostrophes (one for feet, two for inches -- e.g., 6 feet and 4 inches becomes 6'4"). 3 feet make up a ''yard'' (91.44 centimeters). On land, 5,280 feet (1,760 yards) make up a ''mile'' (~1.609 kilometers), whereas a ''nautical mile'' is ~6,076 feet (~1.852 kilometers, or one arc-minute of the Earth's latitude, hence its use even in heavily-metricated nations). 4,840 square yards (43,560 square feet) constitute an acre (~4047 square meters, or just over 2⁄5 hectare).

Since 1959, the foot has been standardized as exactly 30.48 cm. For historical compatibility, though, real estate maps are still drawn in the older ''survey feet'' (1200⁄3937 meters or 30.48006 centimeters).

Two smaller units, ''points'' and ''picas'', are used in graphic design and typesetting, and refer to 1⁄72 and 1⁄12 inch, respectively. Outside those fields, one is liable to run into points in the context of [[UsefulNotes/{{Fonts}} font]] sizes (though usage for font sizes on a computer screen is mostly traditional and will not usually reflect the actual physical size of a font -- technically, a 12pt font should render in the same physical size regardless of the physical size of the screen and screen resolution).

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The basic unit of length is the ''foot'' (30.48 centimeters), which is divided into 12 twelve ''inches'' (2.54 centimeters each). When greater precision is required, fractions of an inch are used (generally based on powers of 2, such as 1⁄2, 1⁄4, 1⁄8, etc.), and so on), except in certain engineering disciplines which use decimals.decimal derivations. Feet and inches are commonly abbreviated by apostrophes (one for feet, two for inches -- e.g., 6 feet and 4 inches becomes 6'4"). 3 Three feet make up a ''yard'' (91.44 centimeters).centimeters ). On land, 5,280 feet (1,760 yards) make up a ''mile'' (~1.609 kilometers), whereas a ''nautical mile'' is ~6,076 around 6,076 feet (~1.852 kilometers, or one calibrated to equal a arc-minute of the Earth's latitude, hence its use even in heavily-metricated nations). equal footing with metric units). 4,840 square yards (43,560 square feet) constitute an acre (~4047 ''acre'' (~4,047 square meters, or just over 2⁄5 hectare).

hectares).

Since 1959, the foot has been standardized as to exactly 30.48 cm. 48cm. For historical compatibility, though, real estate maps are still drawn in the older ''survey feet'' foot'' (1200⁄3937 meters or 30.48006 centimeters).

Two smaller units, ''points'' the ''point'' and ''picas'', the ''pica'', are used in graphic design and typesetting, and refer to 1⁄72 and 1⁄12 inch, respectively. respectively (~352.778 micrometers and 2.117 millimeters, respectively; by implication, six points equal a pica). Outside those fields, one is liable to run into points in the context of [[UsefulNotes/{{Fonts}} font]] sizes (though usage for font sizes on a computer screen is mostly traditional and will not usually reflect the actual physical size of a font -- technically, a 12pt 12-point font should render in the same physical size regardless of the physical size of the screen and screen resolution).



The basic unit of mass is the ''pound'' (453.59237 grams), which is further divided into 16 ''ounces'' (~28.35 grams each)[[note]]Some will insist that the pound is actually a base unit of force (~4.448 newtons), equal to the measurement above multiplied by "standard gravity" (exactly 9.80665 meters per second per second), a uselessly overprecise estimate of gravity at sea level, and that the basic unit of mass is the ''slug'', one pound-force over a foot per second squared (14.59 kilograms.[[/note]]. The pound can be further divided into 7,000 ''grains'' (~64.8 milligrams each), though it is seldom used except in certain specialized fields, mostly archery and firearms. 2,000 pounds make a ''short ton'' (~907.18 kilograms).

A unit almost unheard-of in America, but still used in ordinary British conversation, is the ''stone'' of 14 pounds (~6.35 kilograms); likewise, the ''imperial/long ton'' is defined as 2,240 pounds (~1,016 kilograms, slightly heavier than the ''metric tonne'' of 1,000 kilograms). This has to do with another archaic unit, the ''hundredweight'' -- whereas the American hundredweight was simplified to 100 pounds, the British version was equal to 8 stone (112 pounds), 20 of which form the imperial ton.

Those who deal with precious metals use instead a unit called ''troy pound'' (~373.2 grams), defined as 5,760 grains. The troy pound consists of 12, rather than 16, ''troy ounces'' (~31.10 grams each). When one refers to both units, the standard ounce and pound are sometimes called ''ounce avoirdupois'' and ''pound avoirdupois'', respectively, to avoid confusion. The pound is often abbreviated as "lb", from the Roman equivalent ''libra'' (which is also the source of the £ symbol).

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The basic unit of mass is the ''pound'' (453.59237 grams), which is further divided into 16 sixteen ''ounces'' (~28.35 grams each)[[note]]Some will insist that the pound is actually a base unit of force (~4.448 newtons), equal to the measurement above multiplied by "standard gravity" (exactly 9.80665 meters per second per second), a uselessly overprecise estimate of gravity at sea level, and that the basic unit of mass is the ''slug'', one pound-force over a foot per second squared (14.59 kilograms.[[/note]]. The pound can be further divided into 7,000 ''grains'' (~64.8 milligrams each), though it is seldom used except in certain specialized fields, mostly archery and firearms. 2,000 pounds make a ''short ''(short) ton'' (~907.18 kilograms).

A unit almost unheard-of in America, but still used in ordinary British conversation, is the ''stone'' of 14 pounds (~6.(fourteen pounds, or ~6.35 kilograms); likewise, the ''imperial/long ton'' is defined as 2,240 pounds (~1,016 kilograms, slightly heavier than the ''metric tonne'' of 1,000 kilograms). This has to do with another archaic unit, the ''hundredweight'' -- whereas the American hundredweight was simplified to 100 pounds, the British version was equal to 8 equaled eight stone (112 pounds), 20 twenty of which form the imperial ton.

Those who deal with precious metals use instead a unit called ''troy pound'' (~373.2 grams), defined as 5,760 grains. The troy pound consists of 12, twelve, rather than 16, sixteen, ''troy ounces'' (~31.10 grams each). When one refers to both units, the standard ounce and pound are sometimes called ''ounce avoirdupois'' and ''pound avoirdupois'', respectively, to avoid confusion. The pound is often abbreviated as "lb", from the Roman equivalent ''libra'' (which is also the source of the £ symbol).



The basic unit of liquid volume is the ''gallon'' (~3.79 liters), defined as 231 cubic inches. A gallon is divided into 4 ''quarts'' (~946.35 milliliters), divided in turn into 2 ''pints'' (~473.18 milliliters), also divided in turn into 2 ''cups'' (~236.59 milliliters), each divided ''again'' into 8 ''fluid ounces'' (~29.57 milliliters), not to be confused with the ounce discussed above (note, however, that a fluid ounce of a water-based liquid weighs close enough to an ounce avoirdupois for government work; hence the saying "A pint's a pound the world around," which turns a blind eye to every British part of the world).

For historical reasons, a few dry goods are sold using the dry volume system, whose basic measure is the ''(dry) quart'' (1.101220942715 liters), 4 of which create a ''(dry) gallon'' (~4.40488 liters); crops are typically sold by the ''bushel'' (8 dry gallons, or ~35.23907 liters) or ''peck'' (2 dry gallons, 1⁄4 bushel, or ~8.80977 liters) -- thus Peter Piper picked 2 dry gallons of pickled peppers. The Commonwealth, on the other hand, standardized the gallon, for both wet and dry goods, as exactly 4.54609 liters; the difference is that an ''imperial pint'' is 20 fluid ounces, as opposed to 16 in the US version, so the counterpart to the "pint's a pound..." thing is an imperial gallon weighing 10 pounds; the "cup" does not exist as a unit per se, and a Brit seeing "cups" in an American recipe is likely to think "but what ''size'' of cup?".

42 gallons equal a ''petroleum barrel'' (~158.99 liters), the standard international unit in which oil is sold, but other liquids sold in "barrels" typically use a ''barrel'' of 31.5 gallons each. ''Buttload'' is now used just to mean "a lot", but it used to be 2 hogsheads of 63 gallons each (~477.54 liters), used to measure wine.

Spaces you don't expect to fill with liquid (car trunks, apartments, warehouses, etc.) are expressed in cubic feet (~28,300 cubic centimeters).

Cooks use three additional units: the ''teaspoon'' (~4.929 milliliters), the ''tablespoon'' (3 tablespoons, 1⁄2 fluid ounce, or ~14.787 milliliters), and the ''kitchen cup'' (16 tablespoons, 8 fluid ounces, or 236.588 milliliters), which is slightly more voluminous than the fluid cup above. 2 cups make a ''pint'' (473.176 milliliters).

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The basic unit of liquid volume is the ''gallon'' (~3.79 liters), defined as 231 cubic inches. A gallon is divided into 4 four ''quarts'' (~946.35 milliliters), milliliters each), which is divided in turn into 2 two ''pints'' (~473.18 milliliters), also milliliters each), divided in turn into 2 two ''cups'' (~236.59 milliliters), milliliters each), each divided ''again'' into 8 eight ''fluid ounces'' (~29.57 milliliters), milliliters each), not to be confused with the ounce discussed above (note, however, that a fluid ounce of a water-based liquid weighs close enough to an ounce avoirdupois for government work; hence the saying "A pint's a pound the world around," which turns a blind eye to every British part of the world).

For historical reasons, a few dry goods are sold using the dry volume system, whose basic measure is the ''(dry) quart'' (1.101220942715 liters), 4 four of which create a ''(dry) gallon'' (~4.40488 liters); crops are typically sold by the ''bushel'' (8 dry gallons, or ~35.23907 liters) or ''peck'' (2 dry gallons, 1⁄4 bushel, or ~8.80977 liters) -- thus Peter Piper picked 2 two dry gallons of pickled peppers. The Commonwealth, on the other hand, standardized the gallon, for both wet and dry goods, as exactly 4.54609 liters; the difference is that an ''imperial pint'' is 20 twenty fluid ounces, as opposed to 16 sixteen in the US version, so the counterpart to the "pint's a pound..." thing is an imperial gallon weighing 10 ten pounds; the "cup" does not exist as a unit per se, and a Brit seeing "cups" in an American recipe is likely to think "but what ''size'' of cup?".

42 gallons equal a ''petroleum barrel'' (~158.99 liters), the standard international unit in which oil is sold, but other liquids sold in "barrels" ''barrels'' typically use a ''barrel'' of that which measures 31.5 gallons each. ''Buttload'' is now used just to mean "a lot", but it used to be 2 hogsheads two ''hogsheads'' of 63 gallons each (~477.54 liters), used to measure wine.

Spaces you don't expect to fill with liquid (car trunks, apartments, warehouses, etc.) are expressed in cubic feet ''cubic feet'' (~28,300 cubic centimeters).

Cooks use three additional units: the ''teaspoon'' (~4.929 milliliters), the ''tablespoon'' (3 tablespoons, 1⁄2 fluid ounce, or ~14.787 milliliters), and the ''kitchen cup'' (16 tablespoons, 8 fluid ounces, or 236.588 milliliters), which is slightly more voluminous than the fluid cup above. 2 Two cups make a ''pint'' (473.(~473.176 milliliters).



The standard unit of temperature is the ''Fahrenheit'', where the boiling point of water at sea level is set at 212° and its freezing point at 32° -- a gap of exactly 180°, as intended by the unit's inventor and namesake, German physicist/engineer [[http://en.wikipedia.org/wiki/Daniel_Gabriel_Fahrenheit Daniel Gabriel Fahrenheit]], as it would make it easier to mark a rotary-gauge thermometer.

The mean body temperature of a healthy adult is approximately 98°-100°F (an oft-quoted figure of 98.6° is really just an overprecise conversion from 37°C). 0°F is an arbitrary point, based on the lowest measurable temperature at the time the scale was developed -- the approximate freezing point of seawater. Temperatures less than 0° are colloquially spoken as "''X'' below"; thus, -10°F would be "ten below". The Fahrenheit and Celsius scales coincide at -40°, and absolute zero is exactly -459.67°F. To derive a Celsius temperature from a Fahrenheit reading, subtract 32 from it and divide by 1.8 (9⁄5); conversely, to derive Fahrenheit from Celsius, multiply the reading by 1.8 and then add 32.

to:

The standard unit of temperature is the ''Fahrenheit'', where the boiling point of water at sea level is set at 212° and its freezing point at 32° -- a gap of exactly 180°, as intended by the unit's inventor and namesake, German physicist/engineer [[http://en.wikipedia.org/wiki/Daniel_Gabriel_Fahrenheit Daniel Gabriel Fahrenheit]], as it would make it easier to mark a rotary-gauge thermometer.

thermometer. As for 0°F, it is an arbitrary point, based on the approximate freezing point of seawater, then the lowest measurable temperature at the time the scale was developed.

The mean body temperature of a healthy adult is approximately 98°-100°F (an oft-quoted figure of 98.6° is really just an overprecise conversion from 37°C). 0°F is an arbitrary point, based on the lowest measurable temperature at the time the scale was developed -- the approximate freezing point of seawater. Temperatures less than 0° are colloquially spoken as "''X'' below"; thus, -10°F would be "ten below". The Fahrenheit and Celsius scales coincide at -40°, and absolute zero is exactly -459.67°F. To derive a Celsius temperature from a Fahrenheit reading, subtract 32 from it and divide by 1.8 (9⁄5); conversely, to derive Fahrenheit from Celsius, multiply the reading by 1.8 and then add 32.



American cookbooks specify temperatures exclusively in Fahrenheit. Oven temperatures are always given in 25° increments, e.g. "Preheat oven to 425". The "gas mark" notation seen in British cookbooks is not used.

to:

American cookbooks specify temperatures exclusively in Fahrenheit.°F. Oven temperatures are always given in 25° increments, e.g. "Preheat oven to 425". The "gas mark" notation seen in British cookbooks is not used.



'''Money''':

''See the Useful Notes article on UsefulNotes/AmericanMoney, and the article on AmericanCurrency.''

'''Energy'''. A few units of energy are in common use in the United States. The first and most basic is the foot-pound, which, as the name suggests, is the amount of work done by one pound of force over one foot, or about 1.36 joules. Since nearly anyone who has a use for measurements of energy outside the following applications is primed on SI units, this is mostly used to give laymen/schoolchildren an intuitive idea of what energy and work are.

The second is the kilowatt-hour (3.6 MJ), mostly used by electric companies. Most Americans know what a watt is through electrical device ratings, so to make things more intuitive, power meters in the US use this composite unit (the amount of energy used by a 1000-watt appliance in 1 hour) instead of measuring things directly in joules.

The third customary unit of energy in the United States is the calorie (~4.184 J), used in heating, nutrition, and kinesiology. An odd duck of sorts, the calorie, based on the specific heat of water[[note]]the energy needed to heat 1 gram of water by 1 degree Celsius; but since specific heat varies slightly with temperature and pressure, by 1950s there were no less than ''four'' [[http://en.wikipedia.org/wiki/Calorie different "calories"]] measured at different temperatures, and several more defined through joules[[/note]]. It was introduced as a metric unit in 1824, and was later displaced within the System Internationale by the joule -- but not before it found usage within the United States. The unit most Americans refer to when they say "calorie" -- the nutrition one, see below -- is actually the kilocalorie (formerly known as "large calorie").

There is also the "British Thermal Unit", normally abbreviated BTU, which is mainly used for things like specifying the amount of heat put out by furnaces. There are various definitions of the BTU, which range from about 1,054 to 1,060 J according to the other wiki. To make things even more confusing to outsiders, American Engineers measure cooling in tons (12,000 BTU/hr, equivalent to 1 ton of ice per day or ~3516.85 W) and heating in MBH (one thousand BTU/hr or ~293.07 W; the M is the Roman numeral for 1000, not the expected one million); both of those units are also technically measures of ''power'', not energy, but the BTU is an odd enough bird that it's better to keep everything together.

'''Power:''' The common unit of power in the United States is the horsepower. There are five different types of horsepower, just to be even more confusing. The most common is Mechanical horsepower (more often called brake horsepower, from the method used to derive it) which is used by auto manufacturers to tell [[ViewersAreMorons the public]] that their car is more powerful and therefore makes you more of a man if you own it. 1 unit of mechanical horsepower is 550 foot-pounds per second (~745.7 W). There is also metric horsepower, electrical horsepower, boiler horsepower, and hydraulic horsepower, all of which can be safely ignored, with the sole exception of metric horsepower, which is sometimes used to rate power outputs of automobiles and other engines in Europe and always used for cars in Japan. The metric horsepower is sometimes called the Pferdestaerke (German for "horse strength") and abbreviated "PS" or (rarely) "cv". The metric horsepower is slightly smaller than its American equivalent, at 735.49875 W --for instance, the old Japanese output limit of 280 PS for sports cars is around 276 bhp. You'll also hear references to "SAE net" or "gross" horsepower; specific to car engines, these terms have to do with the testing standard, not the units themselves. SAE gross horsepower, the standard for the auto industry until 1972 and still used in the trucking industry, is measured on a test stand in a pressurized room, with coolant and oil pumped through from outside sources so the engine doesn't have to spin its own pumps. In other words, rigged to give the highest number possible.

to:

'''Money''':

''See
!!Money
->''See
the Useful Notes article on UsefulNotes/AmericanMoney, and the article on AmericanCurrency.''

'''Energy'''.
''
----

!!Energy
A few units of energy are in common use in the United States. use. The first and most basic is the foot-pound, ''foot-pound'', which, as the name suggests, is the amount of work done by one pound of force over one foot, or about 1.foot (~1.36 joules. joules). Since nearly anyone who has a use for measurements of energy outside the following applications is primed on SI units, this is mostly used to give laymen/schoolchildren laymen and/or schoolchildren an intuitive idea of what energy and work are.

The second is the kilowatt-hour (3.''kilowatt-hour'' (~3.6 MJ), megajoules), mostly used by electric companies. Most Americans know what a watt is through electrical device ratings, so to make things more intuitive, power meters in the US use this composite unit (the amount of energy used by a 1000-watt 1,000-watt appliance in 1 an hour) instead of measuring things directly in joules.

The third customary unit of energy in the United States is the calorie ''calorie'' (~4.184 J), joules), used in heating, nutrition, nutrition and kinesiology. An odd duck of sorts, the calorie, unit, based on the specific heat of water[[note]]the water[[note]]The energy needed to heat 1 gram of water by 1 degree Celsius; 1°C; but since specific heat varies slightly with temperature and pressure, by the 1950s there were no less than ''four'' [[http://en.wikipedia.org/wiki/Calorie different "calories"]] measured at different temperatures, and several more defined through joules[[/note]]. It was introduced as a metric unit in 1824, and was later displaced within the System Internationale by the joule -- but not before it found usage within the United States. The unit most Americans refer to when they say "calorie" -- the nutrition nutritional one, see below -- is actually the kilocalorie ''kilocalorie'' (formerly known as "large calorie").

There is also the "British ''British Thermal Unit", normally abbreviated BTU, Unit'' (BTU), which is mainly used for things like specifying the amount of heat put out by furnaces. There are various definitions of the BTU, which range from about 1,054 to 1,060 J according to the other wiki. between 1,054-1,060 joules. To make things even more confusing to outsiders, American Engineers engineers measure cooling in tons (12,000 BTU/hr, BTU per hour, equivalent to 1 a ton of ice per day or ~3516.~3,516.85 W) watts) and heating in MBH (one (a thousand BTU/hr BTU per hour, or ~293.07 W; watts; the M "M" is the Roman numeral for 1000, "1,000", not the expected one million); both of those units are also technically measures of ''power'', not energy, but the BTU is an odd enough bird that it's better to keep everything together.

'''Power:'''
together.
----

!!Power
The common unit of power in the United States is the horsepower. There ''horsepower'', of which there are five different types of horsepower, ''five'' variants, just to be even more confusing. The most common is Mechanical horsepower (more often called brake horsepower, ''mechanical horsepower'' (AKA ''brake horsepower'', from the method used to derive it) which is it), used by auto manufacturers to tell [[ViewersAreMorons the public]] that their car is more powerful powerful, and therefore makes you more of a man if you own it. 1 unit of mechanical horsepower is equivalent to 550 foot-pounds per second (~745.7 W). watts). There is also metric horsepower, electrical horsepower, boiler horsepower, the ''metric horsepower'', ''electrical horsepower'', ''boiler horsepower'', and hydraulic horsepower, ''hydraulic horsepower'', all of which can be safely ignored, with the sole exception of the metric horsepower, version, which is sometimes used to rate power outputs of automobiles and other engines in Europe Europe, and always used for cars in Japan. Japanese cars. The metric horsepower is sometimes called the Pferdestaerke ''Pferdestaerke'' (German for "horse strength") strength"), and abbreviated "PS" or (rarely) "cv". The metric horsepower is slightly smaller than its American equivalent, at 735.49875 W --for watts -- for instance, the old Japanese output limit of 280 PS for sports cars is around 276 bhp.BHP. You'll also hear references to "SAE net" or "gross" horsepower; specific to car engines, these terms have to do with the testing standard, not the units themselves. SAE gross horsepower, the standard for the auto industry until 1972 and still used in the trucking industry, is measured on a test stand in a pressurized room, with coolant and oil pumped through from outside sources so the engine doesn't have to spin its own pumps. In other words, rigged to give the highest number possible.




'''Force:''' Measured in pounds, as stated above. Often expressed as "pounds of force", "lb-force", or "lbf" for disambiguation from the mass unit.

'''Torque:''' Torque, or rotational force, is the cross product of the measured linear force vector and the scalar radius at which it is measured. In conventional units, this is expressed in "pounds-feet". Most TV characters, and many real-life "car guys" who aren't engineers, will express it in foot-pounds. They're not completely wrong, but also not right. Actual engineers, like everywhere else, will use real units.

'''Pressure:''' Air pressure is usually given in psi, or pounds per square inch (~6.894 kPa). Atmospheric pressure is usually given in atmospheres or millimeters of mercury (760 mmHg = 1 atm = 101.325 kPa). Aviators still measure pressure in ''inches'' of mercury (29.92" = 1 atm), both for altimeter settings and engine manifold pressures. Televised weather reports on the news also commonly use inches of mercury for the barometric pressure.

'''Food labeling in the US:''' As mentioned above, the food industry was one of the few to [[strike:embrace]] be legally required to use the metric system during the failed attempt at forced conversion in the US, so food packaging is, outside of school, the place where most Americans encounter the metric system. Since there are few laws regarding the use of metric units, different foods tend to use metric and American units in different ways on packaging. Most of the time, either the American or the metric unit will be indicated first, with its equivalent indicated thereafter in parentheses. Some examples are as follows:

Nutritional labels indicate energy content in kilocalories (confusingly, always labeled as "Calories". Note the capitalization; that's important.) and the amounts of other nutrients and additives in grams or milligrams. Vitamin content is typically indicated only as a percentage of the federally-recommended daily allotment. Since the format of nutritional labeling is set by the FDA, this is harmonious across all food products.

to:

\n'''Force:''' ----

!!Force
Measured in pounds, ''pounds'', as stated above. Often expressed as "pounds of force", "lb-force", or "lbf" for disambiguation from the mass unit.

'''Torque:'''
unit.
----

!!Torque
Torque, or rotational force, is the cross product cross-product of the measured linear force vector and the scalar radius at which it is measured. In conventional units, this is expressed in "pounds-feet".''pounds-feet''. Most TV characters, and many real-life "car guys" who aren't engineers, will express it in foot-pounds. They're not completely wrong, but also not right. Actual engineers, like everywhere else, will use real units.

'''Pressure:'''
units.
----

!!Pressure
Air pressure is usually given in psi, ''psi'', or pounds per square inch (~6.894 kPa). kilopascals). Atmospheric pressure is usually given in atmospheres ''atmospheres'' or millimeters ''millimeters of mercury mercury'' (760 mmHg = 1 atm = 101.325 kPa). kilopascals). Aviators still measure pressure in ''inches'' ''inches of mercury mercury'' (29.92" = 1 atm), both for altimeter settings and engine manifold pressures. Televised weather reports on the news also commonly use inches of mercury for the barometric pressure.

'''Food labeling in the US:'''
pressure.
----

!!Food Labeling
As mentioned above, the food industry was one of the few to [[strike:embrace]] be legally required to use the metric system during the failed attempt at forced conversion in the US, metrication, so food packaging is, outside of school, the place where most Americans encounter the metric system. Since there are few laws regarding the use of metric units, different foods tend to use metric and American customary units in different ways on packaging. Most of the time, either the American or the metric unit system will be indicated first, with its equivalent indicated thereafter in parentheses. Some examples are as follows:

Nutritional labels indicate energy content in kilocalories (confusingly, always labeled as "Calories". Note "Calories" -- note the capitalization; that's important.) important), and the amounts of other nutrients and additives in grams or milligrams. Vitamin content is typically indicated only as a percentage of the federally-recommended daily allotment. Since the format of nutritional labeling is set by the FDA, this is harmonious across all food products.



Beverages sold in plastic bottles (soft drinks and most fruit juices) are labeled in liters for sizes 1 liter and up, or fluid ounces for smaller bottles - common sizes are 12, 16 or 20 fl. oz. 450 milliliters, 0.5 liter, 1 liter, 1.5 liters, 2 liters, or (less commonly) 3 liters. Soft drinks of less than 1 liter size are either sold individually or in "six packs", "eight packs", "12-packs" or 24-packs, held together by a plastic spine called a yoke, by a plastic bag, or packed in cardboard.

Canned beverages are labeled in fluid ounces - common sizes are 8, 10, 12, 18, or 24 oz. Juices and other more expensive beverages may have a little bit removed to save money, leading to 11.5 ounce juice cans. (Incidentally, 12 fluid ounces comes out to ~354.88 ml, but beverage canners almost always round that up to exactly 355 ml.)

to:

Beverages sold in plastic bottles (soft drinks (softdrinks and most fruit juices) are labeled in liters for sizes 1 liter and up, or fluid ounces for smaller bottles - bottles, commonly at -- common sizes are 12, 16 or 20 fl. oz. fluid ounces, 450 milliliters, 0.5 liter, 1 liter, 5, 1, 1.5 liters, 2 liters, 5, 2, or (less commonly) 3 liters. Soft drinks of Softdrinks less than 1 liter size are either sold individually or in "six packs", "eight packs", "12-packs" or 24-packs, "24-packs", held together by a plastic spine called a yoke, by a plastic bag, or packed in cardboard.

Canned beverages are labeled in fluid ounces - -- common sizes are 8, 10, 12, 18, or 24 oz.fluid ounces. Juices and other more expensive beverages may have a little bit removed to save money, leading to 11.5 ounce 5-ounce juice cans. (Incidentally, 12 twelve fluid ounces comes out to ~354.88 ml, milliliters, but beverage canners almost always round that up to exactly 355 ml.355.)







'''Drugs & Alcohol:''' Beer is generally sold in 6-packs, with 6 bottles or cans measuring 12 fl. oz. each. Some beers may be sold in loose bottles of larger sizes from 16 oz. (colloquially, a "tallboy") to 40 oz. (a "forty") Many bars often have pints available as well as pitchers for larger parties; glass mugs of approximately one liter are also fairly common, particularly in areas settled by people from southern Germany (e.g. the Upper Midwest). A pitcher of beer contains roughly 60 oz, or five bottles' worth. Some bars and restaurants specializing in beer will sell drafts in 20 oz "English" pints. Wine and spirits are typically sold in 750 mL bottles, 750 mL being the round metric number that most closely approximates the pre-metric bottle size of 1/5 gallon (a "fifth"). These bottles, as well as the half-size 375 mL bottles, are still colloquially referred to as pints and fifths despite their volume being slightly less than either. (These terms are more commonly used with spirits; many people just call 750 mL of wine a "bottle", though there are various archaic names for the larger sizes, including "Magnum" for a 1.5L, "Jeroboam" for a 3L, or "Methuselah" for a 6L, all the way up to the 30L "Melchizedek".) Spirits are also sold in 1.75 L bottles, which are colloquially called "handles" after [[ExactlyWhatItSaysOnTheTin the carrying handle such bottles usually have]], or "half-gallons" or "half-g's" because they hold slightly less than half a gallon of spirits.

to:

\n'''Drugs & Alcohol:''' ----

!!Drugs and Alcohol
Beer is generally sold in 6-packs, with 6 bottles or cans measuring 12 fl. oz. each. Some beers may be sold in loose bottles of larger sizes from 16 oz. (colloquially, a "tallboy") to 40 oz. (a "forty") Many bars often have pints available as well as pitchers for larger parties; glass mugs of approximately one liter are also fairly common, particularly in areas settled by people from southern Germany (e.g. the Upper Midwest). A pitcher of beer contains roughly 60 oz, or five bottles' worth. Some bars and restaurants specializing in beer will sell drafts in 20 oz "English" pints. Wine and spirits are typically sold in 750 mL bottles, 750 mL being the round metric number that most closely approximates the pre-metric bottle size of 1/5 gallon (a "fifth"). These bottles, as well as the half-size 375 mL bottles, are still colloquially referred to as pints and fifths despite their volume being slightly less than either. (These terms are more commonly used with spirits; many people just call 750 mL of wine a "bottle", though there are various archaic names for the larger sizes, including "Magnum" for a 1.5L, "Jeroboam" for a 3L, or "Methuselah" for a 6L, all the way up to the 30L "Melchizedek".) Spirits are also sold in 1.75 L bottles, which are colloquially called "handles" after [[ExactlyWhatItSaysOnTheTin the carrying handle such bottles usually have]], or "half-gallons" or "half-g's" because they hold slightly less than half a gallon of spirits.




to:

----
14th May '14 2:41:20 AM zero5889
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Whereas in most of the world [[TheMetricSystemIsHereToStay the metric system has come into near-universal use]] by ordinary citizens, the US retains a non-decimal system of measurement largely derived from traditional English units. Technically speaking, the US government has observed the metric system since it ratified the Convention on the Meter in the late 19th century, and indeed, the customary units described below are now legally defined in terms of their metric equivalents rather than their historical origins. The metric system is also almost universally used by the scientific community, though UnitConfusion has sometimes arisen when American and international teams each assumed one was using the other's units. To further complicate matters, the American engineering community has held on to customary units resulting in occasional disconnects between the builders and users of scientific equipment (for example, loss of the Mars Climate Orbiter, popularly attributed to unit confusion between American and European space agencies, was actually due in large part to this sort of thing (Specifically, a software error - the thruster-control algorithms used force pounds, while the high-level software worked in Newtons, a problem caused by lack of communication between NASA and its contractors and exacerbated by lack of proper testing.)). What has come to be known as the "customary system", for lack of a better term, has continued in usage in the US for a number of factors, including tradition, national pride, and the expense of conversion.

An attempt by Congress to mandate metric conversion in the 1970s failed primarily because of the last reason (and the lack of political will to ''insist''). Only the bottling industry switched, but not for that reason. One company (Dr Pepper) advertised the small size gain from 2 quarts to 2 liters, and all other companies followed, which is why 2 liter bottles (and more recently, 1 liter bottles) are in metric but smaller units are in Fluid Oz. (Which makes a [[{{Numa series}} Dirk Pitt]] novel look rather funny). It didn't ''hurt'' that the bottling industry wanted to switch from (heavy, expensive, fragile) glass to (lightweight, inexpensive, durable) plastic bottles at just about that time: if you're going to be retooling everything ''anyway'', might as well make it count.

In Canada, Britain and other English-speaking countries, these units also enjoy non-official use (known as Imperial measurements, after the British Empire), though their defining values may be slightly different; an Imperial gallon, for example, is about 1.2 American gallons. This is, combined with mixing randomly with metric units, of course part of the secret British plan to confuse ''all'' foreign visitors. There's also some unofficial use in other countries, particularly in Latin America, where the close proximity to the USA means American units are sometimes used instead of metric units; engine power and torque, for example, is often measured in Europe in kilowatts and newtons-meter ([=kW=] and [=Nm=]), while in Latin America the former is sometimes measured in horsepower and the latter in pounds-foot. Car wheels (and tire inner dimensions) are almost universally measured in inches, worldwide. An abortive attempt was made to switch to metric in the early [[TheEighties 80s]]; at this writing (2013) even Michelin, the largest force behind the move, no longer supplies tires to fit these sizes with Michelin-branded ones now made by antique reproduction specialists [[https://www.cokertire.com/ Coker Tire]] in low volume at prices just short of exorbitant. (Tire sizes are actually a complicated mix of units, which is okay because almost nobody who's not actually in the automotive industry knows or much cares what they actually mean anyway. The first number is in millimeters, the second number is a percentage (but may be in millimeters), and the last one is in inches (but may also be in millimeters). Fortunately, it's usually trivially obvious if the optional millimeter measurements are used, because the numbers will be much larger (around 2-3x as high for the second number, around ''25x'' as high for the last number).)

to:

Whereas in most of the world [[TheMetricSystemIsHereToStay the metric system has come into near-universal use]] by ordinary citizens, the US United States retains a non-decimal system of measurement system largely derived from traditional English British units. Technically speaking, the US federal government has observed the metric system since it ratified the Convention on the Meter in the late 19th century, and indeed, the customary units described below are now legally defined in terms of through their metric equivalents rather than their historical origins. The metric system is also almost universally used by the scientific community, though UnitConfusion has sometimes arisen when American and international teams each assumed one was using the other's units. To further complicate matters, the American engineering community has held on to customary units units, resulting in occasional disconnects between the builders and users of scientific equipment (for equipment[[note]]For example, the loss of the Mars Climate Orbiter, popularly attributed to unit confusion between American and European space agencies, UnitConfusion, was actually due in large part to this sort of thing (Specifically, (specifically, a software error - -- the thruster-control algorithms used force pounds, while the high-level software worked in Newtons, newtons, a problem caused by lack of communication between NASA and its contractors and exacerbated by lack of proper testing.)). testing).[[/note]]. What has come to be known as the "customary system", for lack of a better term, has continued in usage in the US for a number of factors, including tradition, national pride, and the expense of conversion.

An attempt by Congress to mandate metric conversion in [[TheSeventies the 1970s '70s]] failed primarily because of due to the last reason (and the lack of political will to ''insist''). will). Only the bottling industry switched, but not for that reason. One company (Dr Pepper) other reasons -- Dr. Pepper advertised the small size gain from 2 quarts to 2 liters, and all other companies followed, followed suit, which is why 2 liter 2-liter bottles (and more recently, 1 liter 1-liter bottles) are in metric metric, but smaller units are in Fluid Oz. (Which fluid ounces (which makes a [[{{Numa series}} [[Literature/NUMASeries Dirk Pitt]] novel look rather funny). It didn't ''hurt'' that the bottling industry wanted to switch from (heavy, expensive, fragile) heavy, expensive and fragile glass to (lightweight, inexpensive, durable) light, cheap and durable plastic bottles at just about that time: time; if you're going to be retooling everything ''anyway'', might as well make it count.

In Canada, Britain (the origin of the units) and other English-speaking Anglophone countries, these units also enjoy non-official use (known as Imperial measurements, "Imperial measurements", after the British Empire), though their defining values may be slightly different; an Imperial gallon, ''imperial gallon'', for example, is about 1.2 American gallons. This is, combined with mixing randomly with metric units, of course part of the secret British plan to confuse ''all'' foreign visitors. There's also some unofficial use in other countries, particularly in Latin America, where the close whose proximity to the USA means American units are sometimes used instead more prolific use of metric customary units; engine power and torque, for example, is often measured where most metricated nations (such as those in Europe in Europe) use kilowatts and newtons-meter ([=kW=] for power and [=Nm=]), while in torque, respectively, Latin America the former is sometimes measured in American nations still use horsepower and the latter in pounds-foot. pounds-foot, respectively. Car wheels (and tire inner dimensions) dimensions of tires) are almost universally measured in inches, worldwide. inches. An abortive attempt was made to switch to metric in the early [[TheEighties 80s]]; at this writing (2013) '80s]]; as of the present, even Michelin, the largest driving force behind the move, no longer supplies tires to fit these sizes with Michelin-branded ones now made by antique reproduction specialists [[https://www.cokertire.com/ Coker Tire]] in low volume at prices just short of exorbitant. (Tire Tire sizes are actually a complicated mix of units, which is okay fine because almost nobody who's not actually in outside the automotive industry knows or knows, much less cares about, what they actually mean anyway. The -- the first number is in millimeters, the second number is a percentage (but may be in millimeters), and the last one is in inches (but may also be in millimeters). Fortunately, it's usually trivially obvious if the optional millimeter measurements are used, because the numbers will be much larger (around 2-3x 2-3× as high for the second number, around ''25x'' ''25×'' as high for the last number).)




'''Distance'''. The basic unit of distance is the foot (0.3048 m), which is divided into twelve inches (2.54 cm). Five centimeters is very close to two inches. When more precision than that is required, fractions of an inch are used (Generally power of 2 based (1/2, 1/4, 1/8)), except in certain engineering disciplines which use decimal inches. Measurements in feet and inches are commonly abbreviated using one apostrophe for feet and two apostrophes for inches - six feet and four inches, for example, becomes 6' 4'', and would be referred to in speech as "six-foot-four". Three feet make up a yard (0.9144 m). On land, 5,280 feet make up a mile (~1.609 km), whereas a nautical mile is ~6,076 feet (1852 m, or one minute of latitude, hence its use in the [=SI=].). 4,840 square yards, or 43,560 square feet, constitute an acre (~4047 square meters, or just over two fifths of a hectare).

Since 1959, the foot has been internationally defined as exactly 30.48 cm. For historical compatibility, though, real estate maps are still drawn in the older "survey feet", which are 1200⁄3937, or about .3048006 m long.

Two smaller units, "points" and "picas", are used in graphic design and typesetting, and refer to one twelfth and one seventy-second of an inch. Outside those fields, one is liable to run into "points" in the context of [[UsefulNotes/{{Fonts}} font]] sizes (though the usage of point measurements for font sizes on a computer screen is mostly traditional and will not usually reflect the actual physical size of a font -- technically, 12 pt font should render in the same physical size regardless of the physical size of the screen and screen resolution).

One notable exception to all of this is the US automotive industry. They standardized on metric fasteners in TheEighties, and because of this, it's common to see both fractional-inch and metric sized sockets and wrenches in toolkits. Also, in some circles, lengths of less than a half-inch or so are given in millimeters because they're easier to work with; things like the tips on writing instruments and the width of photo film have been measured in mm for decades.

'''Mass.''' The basic unit of mass is the pound, defined as 453.59237 grams, which is further divided into 16 ounces (~28.35 g). [[note]]Some will insist that the pound is actually the basic unit of force (~4.448 N), equal to the measurement above times "standard gravity" (exactly 9.80665 meters per second per second), a uselessly overprecise estimate of gravity at sea level, and that the basic unit of mass is the "slug," one pound-force over a foot per second squared, or about 14.59 kg.[[/note]] The pound can be further divided into 7,000 grains (~64.8 mg), though this unit is seldom used except in certain specialized fields, mostly archery and firearms. Two thousand pounds make a short ton (~907.18 kg). A unit almost unheard of in America, but which is still used in ordinary conversation in the UK, is the "stone", which equals 14 pounds (~6.35 kg); likewise, the Imperial (or long) ton in the UK, insofar as it's still used, is defined as 2,240 pounds (~1016 kg - note the near similarity to the metric tonne of 1,000 kg). [[note]]This has to do with another archaic unit, the ''hundredweight'', of which there were twenty to a ton. Whereas an American hundredweight came to equal simply 100 pounds, the British hundredweight was equal to eight stone, or 112 pounds - thus the long ton, 2,240 lbs., equals 20 British hundredweights.[[/note]] Those who deal with precious metals use instead a unit called the troy pound, defined as 5760 grains (~373.2 g). The troy pound consists of 12, rather than 16, troy ounces (~31.10 g). When one refers to both units, the standard ounce and pound are sometimes called the ounce and pound avoirdupois to avoid confusion. Pound is often abbreviated ''lb'' from the Roman equivalent ''libra'' (which is also the source of the £ symbol).

'''Volume.''' The basic unit of liquid volume is the gallon, defined as 231 cubic inches (~3.79 l). This is divided into four quarts (around 946.35 ml), each of which are divided into two pints (~473.18 ml), divided in turn into two cups (~236.59 ml), each divided into eight fluid ounces (~29.57 ml), not to be confused with the avoirdupois ounce or troy ounce discussed above. (Note, however, that a fluid ounce of a water-based liquid weighs close enough to one ounce avoirdupois for government work; hence the American saying "A pint's a pound the world around," which turns a blind eye to every British part of the world.) For historical reasons, a few dry goods (such as strawberries and cherry tomatoes) are sold using the dry volume system, where one quart is 1.101220942715 l (again, exactly); crops are typically sold by the bushel, which is 8 dry gallons, or peck, which is 2 -- so Peter Piper picked 2 dry gallons of pickled peppers. The Commonwealth, on the other hand, defines a gallon, both wet and dry, as exactly 4.54609 l; the difference is that an Imperial pint is 20 fl.oz. as opposed to 16, so the counterpart to the "pint's a pound..." thing is 1 Imperial gallon weighs 10 lb; the "cup" unit does not exist, and a Brit seeing "cups" in an American recipe is likely to think "but what ''size'' of cup?". [[TheHitchhikersGuideToTheGalaxy Forty-two]] US gallons equal a petroleum barrel (~158.99 l), the standard international unit in which oil is sold, but other liquids sold in "barrels" typically use a 31.5 gallon barrel. "Buttload" is now used just to mean "a lot", but it used to be two hogsheads or 126 gallons, used to measure wine.

Spaces you don't expect to fill with liquid (car trunks, apartments, warehouses, etc.) are expressed in cubic feet -- one cubic foot is about 28,300 cubic centimeters.

Cooks use three additional units: the teaspoon (5 ml), the tablespoon (15 ml), and the kitchen cup (240 ml), slightly more than the fluid cup above. Three teaspoons make a tablespoon, two tablespoons make about a fluid ounce, sixteen tablespoons make a cup, and two cups make a pint.

Ingredients in recipes are usually measured by volume, not by weight. (The exceptions are meat and produce, which are bought by the pound.) Most American households do not possess a kitchen scale. Because of this, kitchen scales are generally priced only for the upscale or gourmet market, and can cost significantly more than an accurate measuring cup (e.g. 50 cents for a cup vs. $30 or more for the cheapest scale at large chain houseware stores). Americans therefore tend to see British recipes as inaccessible and "only for snooty gourmets."

Prior to the early 1970s, American automobile engines listed their displacement in cubic inches. (The "409" that the BeachBoys sung about was a car with a 409 cubic inch engine.) American cars have been built using metric measurements since the early 1970s, when the energy crisis lead to the downsizing of engines and it became preferable to advertisers to describe the size in liters rather than in cubic inches. but since some cubic inch-based engine sizes are closely related to former performance they still pop up now and then. When Music/VanillaIce rapped about his "five oh," he was referring to the 5.0l Mustang, which was a heavily redesigned "302" that is really closer to 4.9l. Small block Chevy V8s are still closely associated with 350 c.i, although the company hasn't made one (or at least a 5.7l) in years.

'''Temperature'''. The standard unit of temperature in the United States is the degree Fahrenheit (See below for Celsius equivalent). The boiling point of water at sea level is 212° and its freezing point is 32°. Fun fact: the distance between freezing and boiling is 180°; this was intended by Daniel Fahrenheit as it would make it easier to mark a rotary-gauge thermometer: 180 angular degrees could equal 180 temperature degrees.

The mean body temperature of a healthy adult is approximately 98°-100° (an oft-quoted figure of 98.6° is really just an overprecise conversion from 37° Celsius.) Zero degrees is an arbitrary point, based on the lowest temperature that could be measured at the time the scale was developed, the approximate freezing point of seawater. Temperatures less than 0° are colloquially spoken as "X below"; thus, -10° would be "ten below". The Fahrenheit and Celsius scales coincide at -40°, and absolute zero is exactly -459.67°. To derive a Celsius temperature from a Fahrenheit reading, subtract 32 and divide by 1.8. There also exists the Rankine scale, which is largely a historical curiosity at this point. Like the Kelvin scale, it starts at absolute zero and uses the same size degree as the Fahrenheit scale, so water freezes around 491.67° and boils around 671.64°.

American cookbooks specify temperatures exclusively in degrees Fahrenheit. Oven temperatures are always given in increments of 25 degrees, e.g. "Preheat oven to 425". The "gas mark" notation seen in British cookbooks is not used.

'''Dates and Time''': America almost exclusively uses the 12 hour clock, which is divided into two intervals "A.M." (''ante meridiem'', before noon) and "P.M." (''post meridiem'', after noon.) "8 o'clock" therefore is not a specific enough time in certain circumstances, and would be clarified as "8 o'clock in the morning" or "in the evening." The 24 hour clock has limited use in America, being used primarily in the military (thus the sobriquet "military time"). In the Army and Air Force, 18:00 would be called "eighteen hundred hours", whereas the Navy (and by extension, the Marines) drops the "hours" and would simply say "eighteen hundred". To a lesser extent, 24-hour time is used in America by professionals in industries that operate around the clock, such as hospitals, transportation, and (increasingly) restaurants.

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\n'''Distance'''. ----

!!Length and Area
The basic unit of distance length is the foot (0.3048 m), ''foot'' (30.48 centimeters), which is divided into twelve inches 12 ''inches'' (2.54 cm). Five centimeters is very close to two inches. each). When more greater precision than that is required, fractions of an inch are used (Generally power of 2 (generally based (1/2, 1/4, 1/8)), on powers of 2, such as 1⁄2, 1⁄4, 1⁄8, etc.), except in certain engineering disciplines which use decimal inches. Measurements in feet decimals. Feet and inches are commonly abbreviated using one apostrophe for feet and two by apostrophes (one for feet, two for inches - six -- e.g., 6 feet and four inches, for example, 4 inches becomes 6' 4'', and would be referred to in speech as "six-foot-four". Three 6'4"). 3 feet make up a yard (0.9144 m). ''yard'' (91.44 centimeters). On land, 5,280 feet (1,760 yards) make up a mile ''mile'' (~1.609 km), kilometers), whereas a nautical mile ''nautical mile'' is ~6,076 feet (1852 m, (~1.852 kilometers, or one minute arc-minute of the Earth's latitude, hence its use even in the [=SI=].). heavily-metricated nations). 4,840 square yards, or 43,560 yards (43,560 square feet, feet) constitute an acre (~4047 square meters, or just over two fifths of a 2⁄5 hectare).

Since 1959, the foot has been internationally defined standardized as exactly 30.48 cm. For historical compatibility, though, real estate maps are still drawn in the older "survey feet", which are 1200⁄3937, ''survey feet'' (1200⁄3937 meters or about .3048006 m long.

30.48006 centimeters).

Two smaller units, "points" ''points'' and "picas", ''picas'', are used in graphic design and typesetting, and refer to one twelfth 1⁄72 and one seventy-second of an inch. 1⁄12 inch, respectively. Outside those fields, one is liable to run into "points" points in the context of [[UsefulNotes/{{Fonts}} font]] sizes (though the usage of point measurements for font sizes on a computer screen is mostly traditional and will not usually reflect the actual physical size of a font -- technically, 12 pt a 12pt font should render in the same physical size regardless of the physical size of the screen and screen resolution).

One notable exception to all of this is the US automotive industry. They industry, which standardized on metric fasteners in TheEighties, and because of this, the 80s, thus it's common to see both fractional-inch and metric sized sockets and wrenches in toolkits. Also, in some circles, lengths of less than a half-inch or so are given in millimeters because they're easier to work with; things like the tips on writing instruments and the width of photo film have been measured in mm millimeters for decades.

'''Mass.'''
decades.
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!!Mass
The basic unit of mass is the pound, defined as 453.''pound'' (453.59237 grams, grams), which is further divided into 16 ounces ''ounces'' (~28.35 g). [[note]]Some grams each)[[note]]Some will insist that the pound is actually the basic a base unit of force (~4.448 N), newtons), equal to the measurement above times multiplied by "standard gravity" (exactly 9.80665 meters per second per second), a uselessly overprecise estimate of gravity at sea level, and that the basic unit of mass is the "slug," ''slug'', one pound-force over a foot per second squared, or about 14.squared (14.59 kg.[[/note]] kilograms.[[/note]]. The pound can be further divided into 7,000 grains ''grains'' (~64.8 mg), milligrams each), though this unit it is seldom used except in certain specialized fields, mostly archery and firearms. Two thousand 2,000 pounds make a short ton ''short ton'' (~907.18 kg). kilograms).

A unit almost unheard of unheard-of in America, but which is still used in ordinary conversation in the UK, British conversation, is the "stone", which equals ''stone'' of 14 pounds (~6.35 kg); kilograms); likewise, the Imperial (or long) ton in the UK, insofar as it's still used, ''imperial/long ton'' is defined as 2,240 pounds (~1016 kg - note (~1,016 kilograms, slightly heavier than the near similarity to the metric tonne ''metric tonne'' of 1,000 kg). [[note]]This kilograms). This has to do with another archaic unit, the ''hundredweight'', of which there were twenty to a ton. Whereas an ''hundredweight'' -- whereas the American hundredweight came was simplified to equal simply 100 pounds, the British hundredweight version was equal to eight stone, or 112 pounds - thus 8 stone (112 pounds), 20 of which form the long ton, 2,240 lbs., equals 20 British hundredweights.[[/note]] imperial ton.

Those who deal with precious metals use instead a unit called the troy pound, ''troy pound'' (~373.2 grams), defined as 5760 grains (~373.2 g). 5,760 grains. The troy pound consists of 12, rather than 16, troy ounces ''troy ounces'' (~31.10 g). grams each). When one refers to both units, the standard ounce and pound are sometimes called the ounce ''ounce avoirdupois'' and pound avoirdupois ''pound avoirdupois'', respectively, to avoid confusion. Pound The pound is often abbreviated ''lb'' as "lb", from the Roman equivalent ''libra'' (which is also the source of the £ symbol).

'''Volume.'''
symbol).
----

!!Volume
The basic unit of liquid volume is the gallon, ''gallon'' (~3.79 liters), defined as 231 cubic inches (~3.79 l). This inches. A gallon is divided into four quarts (around 946.4 ''quarts'' (~946.35 ml), each of which are divided into two pints (~473.18 ml), milliliters), divided in turn into two cups 2 ''pints'' (~473.18 milliliters), also divided in turn into 2 ''cups'' (~236.59 ml), milliliters), each divided ''again'' into eight fluid ounces 8 ''fluid ounces'' (~29.57 ml), milliliters), not to be confused with the avoirdupois ounce or troy ounce discussed above. (Note, above (note, however, that a fluid ounce of a water-based liquid weighs close enough to one an ounce avoirdupois for government work; hence the American saying "A pint's a pound the world around," which turns a blind eye to every British part of the world.) world).

For historical reasons, a few dry goods (such as strawberries and cherry tomatoes) are sold using the dry volume system, where one quart whose basic measure is 1.the ''(dry) quart'' (1.101220942715 l (again, exactly); liters), 4 of which create a ''(dry) gallon'' (~4.40488 liters); crops are typically sold by the bushel, which is 8 ''bushel'' (8 dry gallons, or peck, which is 2 ~35.23907 liters) or ''peck'' (2 dry gallons, 1⁄4 bushel, or ~8.80977 liters) -- so thus Peter Piper picked 2 dry gallons of pickled peppers. The Commonwealth, on the other hand, defines a standardized the gallon, for both wet and dry, dry goods, as exactly 4.54609 l; liters; the difference is that an Imperial pint ''imperial pint'' is 20 fl.oz. fluid ounces, as opposed to 16, 16 in the US version, so the counterpart to the "pint's a pound..." thing is 1 Imperial an imperial gallon weighs weighing 10 lb; pounds; the "cup" unit does not exist, exist as a unit per se, and a Brit seeing "cups" in an American recipe is likely to think "but what ''size'' of cup?". [[TheHitchhikersGuideToTheGalaxy Forty-two]] US cup?".

42
gallons equal a petroleum barrel ''petroleum barrel'' (~158.99 l), liters), the standard international unit in which oil is sold, but other liquids sold in "barrels" typically use a ''barrel'' of 31.5 gallon barrel. "Buttload" gallons each. ''Buttload'' is now used just to mean "a lot", but it used to be two 2 hogsheads or 126 gallons, of 63 gallons each (~477.54 liters), used to measure wine.

Spaces you don't expect to fill with liquid (car trunks, apartments, warehouses, etc.) are expressed in cubic feet -- one (~28,300 cubic foot is about 28,300 cubic centimeters.

centimeters).

Cooks use three additional units: the teaspoon (5 ml), ''teaspoon'' (~4.929 milliliters), the tablespoon (15 ml), ''tablespoon'' (3 tablespoons, 1⁄2 fluid ounce, or ~14.787 milliliters), and the kitchen cup (240 ml), ''kitchen cup'' (16 tablespoons, 8 fluid ounces, or 236.588 milliliters), which is slightly more voluminous than the fluid cup above. Three teaspoons make a tablespoon, two tablespoons make about a fluid ounce, sixteen tablespoons make a cup, and two 2 cups make a pint.

''pint'' (473.176 milliliters).

Ingredients in recipes are usually measured by volume, not by weight. (The exceptions are weight (save meat and produce, which are bought by the pound.) pound). Most American households do not possess a kitchen scale. Because of this, kitchen scales scale, thus these are generally priced only for the upscale or gourmet market, and can cost significantly more than an accurate measuring cup (e.g. 50 cents 50¢ for a cup vs. $30 or more $30+ for the cheapest scale at large chain houseware stores). Americans therefore tend to see British recipes as inaccessible and "only for snooty gourmets."

Prior to the early 1970s, 70s, American automobile engines listed their displacement in cubic inches. inches (The "409" that the BeachBoys Music/BeachBoys sung about was a car with a 409 cubic inch engine.) 409-cubic-inch engine). American cars have been built using metric measurements since the early 1970s, then, when the energy crisis lead led to the downsizing of engines engines, and it became preferable to advertisers to describe the size in liters rather than in cubic inches. but since some cubic inch-based engine sizes are closely related to former performance they still pop up now and then. When Music/VanillaIce rapped about his "five oh," "five-oh," he was referring to the 5.0l Mustang, which was a heavily redesigned "302" that is really closer to 4.9l. Small block Chevy Small-block Chevrolet V8s are still closely associated with 350 c.i, i., although the company hasn't made one (or at least a 5.7l) in years. \n\n'''Temperature'''.
----

!!Temperature
The standard unit of temperature in the United States is the degree Fahrenheit (See below for Celsius equivalent). The ''Fahrenheit'', where the boiling point of water at sea level is set at 212° and its freezing point is 32°. Fun fact: the distance between freezing and boiling is 180°; this was at 32° -- a gap of exactly 180°, as intended by the unit's inventor and namesake, German physicist/engineer [[http://en.wikipedia.org/wiki/Daniel_Gabriel_Fahrenheit Daniel Fahrenheit Gabriel Fahrenheit]], as it would make it easier to mark a rotary-gauge thermometer: 180 angular degrees could equal 180 temperature degrees.

thermometer.

The mean body temperature of a healthy adult is approximately 98°-100° 98°-100°F (an oft-quoted figure of 98.6° is really just an overprecise conversion from 37° Celsius.) Zero degrees 37°C). 0°F is an arbitrary point, based on the lowest measurable temperature that could be measured at the time the scale was developed, developed -- the approximate freezing point of seawater. Temperatures less than 0° are colloquially spoken as "X "''X'' below"; thus, -10° -10°F would be "ten below". The Fahrenheit and Celsius scales coincide at -40°, and absolute zero is exactly -459.67°. 67°F. To derive a Celsius temperature from a Fahrenheit reading, subtract 32 from it and divide by 1.8. 8 (9⁄5); conversely, to derive Fahrenheit from Celsius, multiply the reading by 1.8 and then add 32.

There also exists the Rankine scale, ''Rankine scale'', which is largely a historical curiosity at this point. Like the Kelvin scale, it starts at absolute zero and uses the same size degree as the Fahrenheit scale, so water freezes around 491.67° and boils around at 671.64°.

American cookbooks specify temperatures exclusively in degrees Fahrenheit. Oven temperatures are always given in increments of 25 degrees, 25° increments, e.g. "Preheat oven to 425". The "gas mark" notation seen in British cookbooks is not used.

'''Dates
used.
----

!!Dates
and Time''': Time
America almost exclusively uses the 12 hour 12-hour clock, which is divided into two intervals "A.M." -- "AM" (''ante meridiem'', before noon) and "P.M." "PM" (''post meridiem'', after noon.) noon). "8 o'clock" therefore is not a specific enough time in certain circumstances, and would be clarified as "8 o'clock in the morning" or "in the evening.morning/evening." The 24 hour 24-hour clock has is mostly limited use in America, being used primarily in to the military (thus military, thus the sobriquet "military time"). time". In the Army and Air Force, 18:00 would be called "eighteen hundred hours", whereas the Navy (and by extension, the Marines) Marine Corps) drops the "hours" and would simply say "eighteen hundred". To a lesser extent, 24-hour time is used in America by professionals in industries that operate around the clock, round-the-clock industries, such as hospitals, transportation, and (increasingly) restaurants.




to:

----
3rd May '14 7:39:38 AM Pigeon_
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'''Volume.''' The basic unit of liquid volume is the gallon, defined as 231 cubic inches (~3.79 L). This is divided into four quarts (around 946.35 mL), each of which are divided into two pints (~473.18 mL), divided in turn into two cups (~236.59 mL), each divided into eight fluid ounces (~29.57 mL), not to be confused with the avoirdupois ounce or troy ounce discussed above. (Note, however, that a fluid ounce of a water-based liquid weighs close enough to one ounce avoirdupois for government work; hence the American saying "A pint's a pound the world around," which turns a blind eye to every British part of the world.) For historical reasons, a few dry goods (such as strawberries and cherry tomatoes) are sold using the dry volume system, where one quart is 1.101220942715 L (again, exactly); crops are typically sold by the bushel, which is 8 dry gallons, or peck, which is 2 -- so Peter Piper picked 2 dry gallons of pickled peppers. The Commonwealth, on the other hand, defines a gallon, both wet and dry, as exactly 4.54609 L, with all other units adjusted accordingly. [[TheHitchhikersGuideToTheGalaxy Forty-two]] US gallons equal a petroleum barrel (~158.99 L), the standard international unit in which oil is sold, but other liquids sold in "barrels" typically use a 31.5 gallon barrel. "Buttload" is now used just to mean "a lot", but it used to be two hogsheads or 126 gallons, used to measure wine.

to:

'''Volume.''' The basic unit of liquid volume is the gallon, defined as 231 cubic inches (~3.79 L).l). This is divided into four quarts (around 946.35 mL), ml), each of which are divided into two pints (~473.18 mL), ml), divided in turn into two cups (~236.59 mL), ml), each divided into eight fluid ounces (~29.57 mL), ml), not to be confused with the avoirdupois ounce or troy ounce discussed above. (Note, however, that a fluid ounce of a water-based liquid weighs close enough to one ounce avoirdupois for government work; hence the American saying "A pint's a pound the world around," which turns a blind eye to every British part of the world.) For historical reasons, a few dry goods (such as strawberries and cherry tomatoes) are sold using the dry volume system, where one quart is 1.101220942715 L l (again, exactly); crops are typically sold by the bushel, which is 8 dry gallons, or peck, which is 2 -- so Peter Piper picked 2 dry gallons of pickled peppers. The Commonwealth, on the other hand, defines a gallon, both wet and dry, as exactly 4.54609 L, with all other units adjusted accordingly.l; the difference is that an Imperial pint is 20 fl.oz. as opposed to 16, so the counterpart to the "pint's a pound..." thing is 1 Imperial gallon weighs 10 lb; the "cup" unit does not exist, and a Brit seeing "cups" in an American recipe is likely to think "but what ''size'' of cup?". [[TheHitchhikersGuideToTheGalaxy Forty-two]] US gallons equal a petroleum barrel (~158.99 L), l), the standard international unit in which oil is sold, but other liquids sold in "barrels" typically use a 31.5 gallon barrel. "Buttload" is now used just to mean "a lot", but it used to be two hogsheads or 126 gallons, used to measure wine.



Cooks use three additional units: the teaspoon (5 mL), the tablespoon (15 mL), and the kitchen cup (240 mL), slightly more (or less in the Commonwealth) than the fluid cup above. Three teaspoons make a tablespoon, two tablespoons make about a fluid ounce, sixteen tablespoons make a cup, and two cups make a pint.

to:

Cooks use three additional units: the teaspoon (5 mL), ml), the tablespoon (15 mL), ml), and the kitchen cup (240 mL), ml), slightly more (or less in the Commonwealth) than the fluid cup above. Three teaspoons make a tablespoon, two tablespoons make about a fluid ounce, sixteen tablespoons make a cup, and two cups make a pint.
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