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I don't understand how energy is released in combustion. We have a reaction of a combustible material with oxygen and this releases energy. In what form is this energy released? It should be some waves or a medium in which the energy is released! And I suppose that released energy causes the products of the combustion to have extremely high kinetic energy (ie. temperature), right? Anyway, can you answer me please.

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    $\begingroup$ I Googled combustion energy and was sent to the Wikipedia entry Heat of combustion. What searches have you done that failed to bring results? $\endgroup$ – Kyle Kanos Nov 25 '15 at 11:24
  • $\begingroup$ I 've been to that webpage, it doesn't answer my question. Have you read my question in full, or you just spotted two words, combustion and heat? $\endgroup$ – ergon Nov 25 '15 at 12:20
  • $\begingroup$ I saw the question In what form is this energy released? & then did the Google search. That page clearly states that energy is released as heat, so I made my comment. $\endgroup$ – Kyle Kanos Nov 25 '15 at 12:27
  • $\begingroup$ I STILL do not have the answer I am after. What is heat? How is it released? In what way? Is it waves? $\endgroup$ – ergon Nov 25 '15 at 19:00
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    $\begingroup$ en.wikipedia.org/wiki/Heat $\endgroup$ – Kyle Kanos Nov 25 '15 at 19:06
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Notice, the combustion is an exothermic chemical reaction with the oxygen that liberates the energy mainly in the form of heat, comparatively less amount of light, sound etc. Reactant molecules react with the oxygen that results in breaking of old bonds & formation of new bonds with comparatively less bonding energy. Thus, releasing the rest amount of energy in form of heat during combustion.

In the combustion process, the heat energy comes from the chemical energy stored in the combustible material being burnt.

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