Is heat stored internally or externally at the atom or molecular level?
Jerome Puetz

Heat is the flow of thermal energy between bodies at different temperatures (usually, from a hot body to a cold body, but refrigerators can cause it to flow in the opposite direction). Thermal energy is stored as a combination of kinetic energy (molecules bouncing around), vibrational energy (when molecular bonds stretch and compress like springs), and rotational energy (twisting and turning of molecules).

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