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1st. Principle-- If two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other.

2nd. Principle-- Heat energy and mechanical work are mutually convertible.

3rd.-- It is impossible to construct a mechanical device ( engine) whose sole purpose is to convert all of the heat energy supply to it into equal amount of work.

4th.-- The entropy of a pure crystalline substance at absolute zero temperature is zero

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