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In which of the following mechanisms, is heat conducted in liquid and gas

In which of the following mechanisms, is heat conducted in liquid and gas Correct Answer Collisions and diffusion

Conduction heat transfer takes place whenever a temperature gradient exists in a stationary medium. Conduction is one of the basic modes of heat transfer. On a microscopic level, conduction heat transfer is due to the elastic impact of molecules in fluids, due to molecular vibration and rotation about their lattice positions and due to free electron migration in solids.

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