What is Exothermic reaction?
An '''exothermic reaction''' is a [[chemical reaction]] where the [[wikt:substance|substances]] reacting release [[energy]] as [[heat]]. An example of this is [[combustion]]. Exothermic reactions transfer energy to the surroundings. The reaction that does the opposite (it absorbs heat) is an [[endothermic reaction]]. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become hotter. The temperature increase can be detected using a thermometer, and the thermal energy by a [[calorimeter]]. Some examples of exothermic reactions are: *[[burning]] *[[respiration]] *neutralisation reactions between [[acid]]s and [[alkali]]s *the reaction between water and [[calcium oxide]] == Related pages == * [[Heat of combustion]] {{-}} {{physics-stub}} [[Category:Thermodynamics]] [[Category:Chemical reactions]]