We had the experiment Mechanical Equivalent of Heat in physics. There is this qu

Question

We had the experiment Mechanical Equivalent of Heat in physics.

There is this question:

In the old calorific liquid picture, as explained in the theory part, it was imagined that a calorific fluid just flows from the hot to the cold object until the they reach the same temperature. We now know that this picture is erroneous and that heat contained in a body comes from the kinetic energy of its constituents (atoms, molecules, etc). When a hot object is in contact with a cold one, how does, in this new picture, heat transfer from the hot to the cold object? (Hint: Think of what happens to the microscopic constituents of the two bodies).

Explanation / Answer

As in this new picture,

we consider that heat contained in a body comes from the kinetic energy of its constituents such as atoms, molecules etc.

thus larger, small or medium heat contained in a system means larger, small or medium kinetic energy of its constintuents.

thus when a hot object is in contact with cold one, constituents(atoms, molecules etc.) of hot body will collide with constituents of cold body, and in this collision they transfer their momentum to constituents of cold body, and thus transfer the kinetic energy.

when both bodies constituents acquire same kinetic energy, they will be in equilibrium, No further transfer of kinetic energy will take place.

thus heat transfer from hot to cold bodies.

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