Statement I It is convenient to define two specific heats $C_{p}$ and $C_{V}$ in case of a gas. However it is not generally necessary to define two specific heats in case of a solid or liquid
Statement II For a given temperature rise, the expansion of a solid or liquid is negligible as compared to that of a gas.

Question

Statement I It is convenient to define two specific heats $C_{p}$ and $C_{V}$ in case of a gas. However it is not generally necessary to define two specific heats in case of a solid or liquid

Statement II For a given temperature rise, the expansion of a solid or liquid is negligible as compared to that of a gas.

TestHub · Accepted Answer

Heating a gas at constant pressure includes appreciable expansion work.
At constant volume, that expansion work is absent.
Solids and liquids expand much less, so the distinction is usually negligible in elementary calculations.
Both statements are true; Statement II explains Statement I.

Physics - Heat & Thermo Question with Solution | TestHub

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