Question

Limitations of first law of thermodynamics in physics

Answer 1

First law does not provide a clear idea about the direction of absorption or evolution of heat. The informations provided by the first law of thermodynamics are not enough to predict the spontaneity or feasibility of a process.

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Answer 2

Answer:

The limitation of the first law of thermodynamics is that it does not say anything about the direction of flow of heat. It does not say anything whether the process is a spontaneous process or not. The reverse process is not possible. In actual practice, the heat doesn't convert completely into work.