Heat, in thermodynamics, is defined as energy transferred between a system and its surroundings through microscopic mechanisms like conduction, radiation, and friction. These involve the motion of sub-atomic, atomic, or molecular particles, contrasting with macroscopic energy transfers like thermodynamic work or matter transfer. For a closed system, the heat involved in a thermodynamic process equals the change in internal energy minus any work done. This relationship is a formulation of the first law of thermodynamics.
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