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The first law of thermodynamics is proved by experiments. Select the correct choice for it.

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The first law of thermodynamics is proved by experiments. Select the correct choice for it.

(a) de is an exact differential

(b) dq is an exact differential

(c) dw is an exact differential

(d) The relation has been proved theoretically

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Asked question is from A Brief Review of Thermodynamics in portion Compressible Flow – Preliminary Aspects of Aerodynamics

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Right answer is (a) de is an exact differential

Explanation: The first law in thermodynamics is an empirical relation and has been verified by experiments. It has never been violated. Exact differential depends only on final and initial points. de is an exact differential while dq and dw are not exact differentials.

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