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.
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
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:
Heat
…metre). In ordinary language, English 'heat' or 'warmth', just as French chaleur, German Hitze or Wärme, Latin calor, Greek θάλπος, etc. refers to either thermal energy or temperature, or the human perception of these. Later, chaleur (as used by Sadi Carnot), 'heat', and Wärme became equivalents also as specific…
Thermal radiation in visible light can be seen on this hot metalwork, due to blackbody radiation.