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. Rather than by mechanical or other effects in the surroundings, thermodynamic work is defined through changes in the system’s macroscopic state variables, in conjugate pairs such as pressure and volume, or magnetisation and magnetic field strength.
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. Rather than by mechanical or other effects in the surroundings, thermodynamic work is defined through changes in the system’s macroscopic state variables, in conjugate pairs such as pressure and volume, or magnetisation and magnetic field strength.
Source: Wikipedia "Heat" · CC BY-SA 4.0
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