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Exothermic process

In thermodynamics, an exothermic process (from Ancient Greek (éxō)'outward' and (thermikós)'thermal') 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).

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