- The non-mechanical form of energy which is transferred between bodies or regions at different temperatures which are in contact with each other. Heat is transferred from a hotter body or region to a colder body or region. Such regions may also be within the same body. Heat can be transferred via conduction, convection, or radiation. The SI unit for heat is the joule, and other units often utilized are the calorie, and British thermal unit. Also called heat energy, or thermal energy.
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