[[quoteright:214:[[Webcomic/{{Adventurers}} http://static.tvtropes.org/pmwiki/pub/images/cit_pure_energy.jpg]]]]

-> '''Senior Officer:''' The weird thing is, the bodies show traces of... pure energy.\\
'''Detective Randall:''' Energy? Like, electric, solar, or what?\\
'''Senior Officer:''' No, Randall. [[PunctuatedForEmphasis Just. Pure. Energy.]]\\
'''Detective Randall:''' [[DullSurprise ...Odd.]]
-->-- "TheLazerCollection 3" by Dom Fera

Energy is formally defined as the capacity to do work (whilst work is defined as [[ShapedLikeItself the energy transferred by a force]]).[[note]]The actual formal definition of energy isn't so confusingly circular, but [[LiesToChildren takes a lot more time and effort to explain]][[/note]]. Energy is not something you can, for example, pick up and put in your pocket.

But the [[EEqualsMCHammer famous]] "E=mc[[superscript:2]]" equation gave us a notion that matter and energy were interchangeable in a certain way, and, as they tend to, Science fiction writers went off half-cocked with the idea.

You will therefore find in quite a lot of SpeculativeFiction, the notion that energy is just another form of matter -- particularly, a sort of warm [[PowerGlows glowy]] kind of matter, whose exact properties can be fine tuned to user specifications, and which can be summoned or banished with a button-press.

In this sort of system, you can treat "Pure Energy" as a [[HardLight building material]], and [[ElementalCrafting make things out of it]]. Such things would, quite naturally, be of higher quality than anything made out of mundane old matter. In the universe of real physics, claiming something is "made out of pure energy" is flat out nonsensical -- it makes as much sense to say that something is "made out of pure velocity," or that pasta is "[[InsubstantialIngredients made out of yummy]]".

If we're feeling generous, we can suppose that they [[LiesToChildren don't really mean]] to treat energy like a kind of matter, and are actually dealing with highly energized exotic matter, such as plasma, [[MinovskyPhysics certain created energy sources]] or [[SteamPunk Phlogisticated Aether]], but they really shouldn't be going around calling it "Pure Energy".

In ElementalRockPaperScissors settings, this enables "energy elements" -- Fire, Lightning, Light, and Darkness -- to be treated and manipulated the same as "material elements" -- Air, Water, Earth, Metal, Wood.

Misinterpreting the law of conservation of energy - "energy cannot be created or destroyed" - to mean that objects made of "Pure Energy" are ''indestructible'' is a common subtrope. Of course, if "energy cannot be created", then we're left to wonder how, according to this subtrope, "Pure Energy" came into being in the first place. Or why the same rule doesn't apply to stuff made of Pure Matter (as the actual [=LoC=] does). [[note]]One source of confusion here is that in laws of conservation, "destroy" means, more or less, '''eliminate entirely from reality'''. In everyday usage, though, it simply means "dismantle into lots of tiny bits" — even if you ''think'' you eliminated the thing from reality. When you "destroy" a piece of paper by setting it on fire, you're not violating physics, because that's a different sense of "destroy". The paper no longer exists as "paper", but as lots of molecules once connected as "paper". In the sense of the [=LoC=], fictional characters indeed have no hope of "destroying" a Pure Energy object, but they don't have any hope of destroying a basketball either — only of (in either case) breaking it down into lots of tiny bits.[[/note]]

'''See also:'''
* EnergyBall: An orb of the stuff usually used offensively.
* EnergyBeings are ''people'' made of Pure Energy.
** BallOfLightTransformation, transforming to Pure Energy.
* A SwirlyEnergyThingy is a Pure Energy-based CoolGate.
* {{Laser Blade}}s are swords forged out of the stuff.
* {{Sword Beam}}s are beams that shoot out from swords.
* DeflectorShields are usually walls made of Pure Energy.
* HardLight, when it's just "we [[TimTaylorTechnology turned up the power so high]] that it became solid" as in ''Automan'', is a solid projection made of Pure Energy.[[note]]You can increase the density of light to that of a solid, but the pressure requirements are insane. To obtain light as dense as water, you would need to compress it at a pressure of 10^12 atmospheres. Under such conditions, the light would behave as something resembling a hard solid (i.e. it would have a defined volume, shape, and be very hard to distort) as long as the containment held. Of course, pressures of this scale exist on Earth only in nuclear explosions.[[/note]]
* FrickinLaserBeams are, by and large, simply conventional pistols that fire bullets made of Pure Energy, rather than being lasers or something similarly hard to dodge.
* Objects made by a [[GreenLanternRing Green Lantern Power Ring]].
* PowerSource to most advanced or magical machinery.
* Frequently a source of NonElemental damage.

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!!Examples:
[[foldercontrol]]

[[folder:Advertising]]
* One of the brands of Leggs® panty hose was called "Sheer Energy".
[[/folder]]

[[folder:Comics]]
* Smax in comic ''[[TopTen Top 10]]'' can fire energy from his chest. This is later named "The Strong Light."
* The "Pure Energy items are indestructible" thing shows up all the time in the MarvelUniverse.
* ComicBook/{{Cyclops}} releases blasts of "pure concussive force" from his eyes.
* In the ''Comicbook/{{WITCH}}'' comic Will's element is defined as "Pure Energy" while the rest of the Guardians are a FourElementEnsemble. In the TV series her element is defined as "[[ElementNumberFive Quintessence]]" which is basically ShockAndAwe mixed with LightningCanDoAnything.
[[/folder]]

[[folder:Film, Animated]]
* In the 2009 ''WesternAnimation/AstroBoy'' movie, the title character is powered by a glowy energy that is "more powerful than nuclear energy."
* The Drej in ''WesternAnimation/TitanAE'' are shown to made entirely out of raw electrical energy.
[[/folder]]

[[folder:Literature]]
* In the Literature/{{Discworld}} book ''Discworld/{{Sourcery}}'', a tower is built out of [[AWizardDidIt pure magic]].
* In ''Literature/{{Gone}}'', Sam can shoot energy beams from his hands.
[[/folder]]

[[folder:LiveActionTV]]
* One episode of ''Series/BlakesSeven'' features a force wall whose optical properties had been set such that it was indistinguishable from a normal door.
* ''Franchise/StarTrek'', the original series at least, might as well be the trope namer. The number of times Spock says "Pure Energy" over the course of the series is only rivaled by the number of times he says "[[PlanetOfHats Near Earth parallel]], captain."
[[/folder]]

[[folder:TabletopGames]]
* ''DungeonsAndDragons'':
** Magic missile spells are made of force, which is basically the same thing as 'pure energy'. Other force effects include the Bigby's line of spells, and a dragon that BREATHES force energy.
** Brilliant energy weapons have their damaging part transformed into pure energy that passes through everything else but damages living things, making armour useless against it.
* Warp Energy in ''TabletopGame/{{Warhammer}}'' and ''TabletopGame/{{Warhammer 40000}}''. Technically it's ''psychic'' energy, composed of the thoughts and emotions of every sapient being, but in practice it is treated as this trope.
[[/folder]]

[[folder:VideoGames]]
* ''MegaManStarForce 2'' featured Matter Waves. The futuristic society in the series essentially does just about everything using energy waves, such as creating snow for a ski resort, making fountains, and controlling... the... weather. Ignoring all of the completely ridiculous things done with it, however, you still have the Matter Waves, which are basically electromagnetic waves in tangible form. You have Matter Wave Skis, Matter Wave Vacuum Cleaners, Matter Wave {{MacGuffin}}s, and Matter Wave BUTLERS.
* ''LostPlanet'' has "Thermal Energy", which is harvested by killing Akrid. It's some kind of [[PowerGlows glowing]] orange goo that has a large potentency. Possibly overlaps with GreenRocks.
* ''VideoGame/HalfLife2'''s [[EnergyBall Combine Dark Energy Orbs]] are balls of energy either kept in a stasis and used to power generators, or contained in a capsule which can be used as a weapon, releasing the orb which instantly disintegrates most biological lifeforms it comes in contact with.
* ''VideoGame/FinalFantasyVI'' has the [[BossBattle boss]] Atma/Ultima Weapon, which before the battle [[BadassBoast boasts]] of being "pure energy, and [[TimeAbyss ancient as the cosmos]]." It is ''[[ThatOneBoss no]]'' [[DiscOneFinalBoss pushover]].
** Which is why beating it by [[spoiler: draining all of its MP]] makes sense - without MP, it's as good as non-existent.
* ''In VideoGame/MightAndMagic VI'', gold dragons and energy drakes hand out "energy" damage as distinct from fire, cold or electric, and so do "Ancient Weapons".
* In {{Albion}} forcefields found in one dungeon are apparently made of pure energy. Considering that one of the heroes is a scientist, this understandably confuses him. He does manage to conclude that the field appears to be made of electrical discharges, but has no visible power source. He later concludes that information, energy and matter are interchangeable on the eponimous planet, allowing magic to exist.
* In [[VideoGame/XCOMEnemyUnknown X-COM: Enemy Unknown]], the Outsider alien is deemed a being "made of almost pure energy" by Dr. Vahlen. She's just as confused as the rest of us, perhaps lampshading the impossibility of this trope.
[[/folder]]

[[folder:Webcomics]]
* ''GeneCatlow'' has seen a lot of this after Friendship Island was introduced.
[[/folder]]

[[folder:Web Original]]
* [[TheLazerCollection Just. Pure.]] [[http://www.youtube.com/watch?v=d3ZYF-Zmo2E&t=0m40s Energy]].
** Ironically this disjointed collection of 4chan-esque shorts might be the only instance where the words "pure energy" actually make sense. The "lazers" are just a large wave of light, heat, and concussive force -- the purest expressions of energy in a system -- expelled all at once.
* This is a pretty common power type in the ‘’GlobalGuardiansPBEMUniverse’’. Victory, Evengella, Argent, both Quantums (one an American superhero with [[PhysicalGod vast and near-limitless power]], the other a Spanish hero with not quite as much power), Silverwing, and the Chaos Lord all use the “cosmic energy” rational, and some use the “energy can’t be destroyed” assumption as well.
[[/folder]]

[[folder:WesternAnimation]]
* In ''WesternAnimation/{{Transformers}}'', Energon, so near as we can tell, is Pure Energy which has been poured into a box for easy storage.
** The late G1 episode, "Call of the Primitives", featured a monster named Tornedron who was described as being made of "pure energy", thereby allowing him to assume many (apparently solid) forms and making him superior to Unicron, a being of matter... ''riiiight''.
** Other incarnations, like ''WesternAnimation/BeastWars'', made Energon into a form of GreenRocks that generate a lot of power and have all sorts of funky effects.
** G1 Energon is weird. Any source of fuel can be poured into a cube made of... white outlines... and once inside, it promptly turns into glowy stuff that robots can ''drink'' or use to fuel stuff. All the other series (including ''WesternAnimation/BeastWars'', which actually follows G1) treat it as a natural resource that can be mined. [[MadeOfExplodium It still blows up if you rub it the wrong way]], though. Interestingly, most if not all weapons made of Pure Energy in ''Transformers'' are called "energon weapons". They seem to be quite solid. In ''TransformersAnimated'', the shiny parts of a weapon that's mostly made of shiny can ''hold the solid parts in place.'' It's... pretty safe to say that it all runs on RuleOfCool.
* Dexter of ''WesternAnimation/DextersLaboratory'' once tried to produce pure energy in his laboratory. In the few moments before his machine crashed, it was depicted as a giant glowing atom (you get a better view of it in [[CloudCuckooLander his grandfather's]] [[TheCuckooLanderWasRight Rube Goldberg machine]]).
* Megabyte in ''ReBoot'' once extracted all the energy in Mainframe's core and converted it into a liquid state which was stored in a "transformer". But since this pure energy was unnatural it caused problems when the User loaded a game, including forcing the game to land on the Principal office, corrupting the game and turning Megabyte into a Megatruck.
[[/folder]]
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