Heat like work, is a form of energy.

The energy transfer between a system and its surroundings is called heat if it occurs by virtue  of the temperature difference across the boundary.

The two modes of energy transfer – work and heat- depend on the choice of the system. Heat energy moves from a hotter body to a colder body upon contact of the two bodies.

If two bodies at different temperatures are allowed to remain in contact, the system of two bodies will eventually reach a thermal equilibrium (they will have the same temperature).

A body never contains heat. Rather heat is a transient phenomenon and can be identified as it crosses the boundary.

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