Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In thermodynamics, the term exothermic describes a process or reaction that releases energy usually in the form of heat, but also in the form of light, electricity, or sound. Its etymology stems from the Greek prefix ex- and the Greek word thermein. The term exothermic was first coined by Marcellin Berthelot. The opposite of an exothermic process is an endothermic process, one that absorbs energy in the form of heat.

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