The study of heat is called thermodynamics.
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Heat?
An exothermic change is a change that releases heat. Combustion is an exothermic chemical reaction.Adding water to sulfuric acid releases heat, called exothermic heat of mixing. Exothermic changes are the opposite of endothermic changes that absorb heat when they take place.
This the heat released during a chemical reaction.
A thermochemical reaction is a chemical reaction that involves the absorption or release of heat. This heat exchange is responsible for changes in the temperature of the system during the reaction. Thermochemical reactions are important in understanding processes such as combustion, photosynthesis, and digestion.
An exothermic reaction is a chemical reaction that gives off heat. In an exothermic reaction, energy is released in the form of heat to the surroundings.