Jisho

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Noun
1. heat source
Wikipedia definition
2. Thermal reservoirA thermal reservoir, a short-form of thermal energy reservoir, or thermal bath is a thermodynamic system with a heat capacity that is large enough that when it is in thermal contact with another system of interest or its environment, its temperature remains effectively constant. It is an effectively infinite pool of thermal energy at a given, constant temperature. The temperature of the reservoir does not change irrespective of whether heat is added or extracted.
Read “Thermal reservoir” on English Wikipedia
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