Exothermic process
Thermodynamic process that releases energy to its surroundings / From Wikipedia, the free encyclopedia
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In thermodynamics, an exothermic process (from Ancient Greek έξω (éxō) 'outward', and θερμικός (thermikós) 'thermal')[1] is a thermodynamic process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning hydrogen). The term exothermic was first coined by 19th-century French chemist Marcellin Berthelot.
The opposite of an exothermic process is an endothermic process, one that absorbs energy usually in the form of heat. The concept is frequently applied in the physical sciences to chemical reactions where chemical bond energy is converted to thermal energy (heat).