definition
(of a reaction) That releases energy in the form of heat.
definition
(of a compound) That releases heat during its formation, and absorbs it during its decomposition
definition
Of an animal: whose body temperature is regulated by external factors; cold-blooded.
The coke (essentially impure carbon) burns in the blast of hot air to form carbon dioxide - a strongly exothermic reaction.
Compounds formed with the evolution of heat are termed exothermic, while those formed with an absorption are termed endothermic. Explosives are the commonest examples of endothermic compounds.
Substances with positive heats of formation are termed exothermic; those with negative heats of formation are termed endothermic. The latter, which are not very numerous, give out heat on decomposition into their elements, and are more or less unstable.
Similarly, its violently exothermic reaction with hydrazine made this an extremely powerful propellant combination for rocket fuel in the late 1950s.
Acetylene is one of those bodies the formation of which is attended with the disappearance of heat, and it is for this reason termed an "endothermic" compound, in contradis thermic tinction to those bodies which evolve heat in their nature of formation, and which are called "exothermic."
This simply means that a reaction which is exothermic in one direction will be endothermic in the other direction.
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