Coolant meaning

ko͝o'lənt
An agent that produces cooling, especially a fluid that draws off heat by circulating through an engine or by bathing a mechanical part.
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A substance, usually a fluid, used to remove heat, as from a nuclear reactor, an internal-combustion engine, molten metal, etc.
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A medium, usually fluid, used to draw heat from an object.

Coolant is used in car engines and industrial processes, where excess heat could cause machine damage.

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