thermal energy
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Thermal energy is the energy that exists inside an object or system because of how hot it is. It matters because it affects how objects behave and interact with their surroundings—for example, how heat moves between things and how much work energy can be extracted from temperature differences.
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Thermal radiation in visible light can be seen on this hot metalwork, due to blackbody radiation.
The term "thermal energy" is often used ambiguously in physics and engineering. It can denote several different physical concepts, including: