Thermal energy
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The term "thermal energy" is often used ambiguously in physics and engineering. It can denote several different physical concepts, including:
Thermal radiation in visible light can be seen on this hot metalwork, due to blackbody radiation.
Heat
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In thermodynamics, heat is defined as energy in transfer between a body and its surroundings, other than through thermodynamic work or through transfer of matter.
Thermal energy
…Internal energy: The energy contained within a body of matter or radiation, excluding the potential energy of the whole system. Heat: Energy in transfer between a system and its surroundings by mechanisms other than thermodynamic work and transfer of matter. The characteristic energy…
A glowing-hot metal bar showing incandescence, the emission of light due to its temperature, is often recognized as a source of heat.
Galileo Galilei
John Locke
Brook Taylor