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...structure is changed or converted. Fuel releases its energy either through chemical means, such as burning, or nuclear means, such as [[nuclear fission]] or [[ ...of energy. Their [[Cell (biology)|cell]]s engage in an [[enzyme]]-mediated chemical process called ''[[metabolism]]'' that converts energy from [[food]] or sol

<!-- [[Image:Kevlar chemical structure H-bonds.png|thumb|200px|right|Chemical structure of Kevlar. Bold: [[Monomer]] unit. Dashed: [[hydrogen bond]]s.]] [[Image:Kevlar chemical synthesis.jpg|center|300px|The reaction of 1,4-phenyl-diamine (para-phenylenediamine) with terephthaloyl chloride y

...r]]), usually O₂, to release [[heat]]. In a complete combustion reaction, a compound reacts with an oxidizing element, and the products are compound ...oxide]]. Complete combustion is generally impossible to achieve unless the reaction occurs where conditions are carefully controlled (e.g. in a laboratory envi

...ctive area of research. Most spacecraft today are propelled by heating the reaction mass and allowing it to flow out the back of the vehicle. This sort of [[e ...ulsion for north-south stationkeeping. Interplanetary vehicles mostly use chemical rockets as well, although a few have experimentally used [[ion thruster]]s

...both plates to lead sulphate. When the battery is recharged, the chemical reaction is reversed. The lead sulphate reforms into lead oxide and lead, restoring ...e electrolyte can occur, but when one cell explodes, it sets off a [[chain reaction]] in the rest. Such batteries should be isolated and discarded, taking gre

...on seems to be produced by certain bacteria, rather than a direct chemical reaction.

...ther machines that have engines to provide an environment for a [[chemical reaction]] where unburned [[hydrocarbon]]s are more completely [[combustion|combuste ...rticulate (soot), however they are incapable of reducing NO_x as chemical reactions always occur in the simplest possible way, and the existing O<sub

...o one of two categories - either make the ceramic in the desired shape, by reaction in situ, or by forming powders into the desired shape, and then [[sintering ...iques from the semiconductor industry, such as [[Chemical vapor deposition|chemical vapour deposition]], and is very useful for coatings.

...ured in a press under heat and pressure. Heat facilitates a polymerization reaction that crosslinks rubber monomers to create long elastic molecules. These pol ...ive it its final shape, and applying heat energy to stimulate the chemical reaction between the rubber and other materials. In this process the green tire is a

...es''' depend on the [[exothermic]] chemical process of [[combustion]]: the reaction of a [[fuel]], typically with air, although other oxidisers such as [[nitro ...e energy than the original compressed fuel/air mixture (which had higher [[chemical energy]]). The available energy is manifested as high [[temperature]] and [

...]] gas. A pellet of [[sodium azide]] (NaN₃) is ignited. A rapid reaction occurs, generating [[nitrogen]] gas (N₂). to fill the air bag. [ ...ment. Small amounts of [[sodium hydroxide]] may initially be present. This chemical can cause minor irritation to the eyes and/or open wounds; however, with ex

:**Significantly reduced "engine out" or "feedgas" emissions (the chemical products of engine combustion). ...e heat to generate more output. The combustion process converts the fuel's chemical energy into heat energy, whether the fuel arrived via EFI or via a carburet

...es''' depend on the [[exothermic]] chemical process of [[combustion]]: the reaction of a [[fuel]], typically with air, although other oxidisers such as [[nitro ...e energy than the original compressed fuel/air mixture (which had higher [[chemical energy]]). The available energy is manifested as high [[temperature]] and [

...elow) is a silvery and [[ductile]] member of the [[poor metal]] group of [[chemical element]]s. It has the symbol '''Al'''; its [[atomic number]] is 13. ...can be deposited onto a flat surface by [[chemical vapour deposition]] or chemical means to form [[optical coating]]s and [[mirror]]s. These coatings form an

...ccurs in a confined space called a combustion chamber. This [[exothermic]] reaction of a [[fuel]] with an [[oxidizer]] creates gases of high [[temperature]] an ...es''' depend on the [[exothermic]] chemical process of [[combustion]]: the reaction of a [[fuel]], typically with air, although other oxidisers such as [[nitro