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The term "thermal energy" is used loosely in various contexts in physics and engineering. It can refer to several different well-defined physical concepts. These include the internal energy or enthalpy of a body of matter and radiation; heat, defined as a type of energy transfer ; and the characteristic energy of a degree of freedom, k B T {\displaystyle k_{\mathrm {B} }T} , in a system that is described in terms of its microscopic particulate constituents.
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