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For a calorically perfect gas, entropy is not________

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For a calorically perfect gas, entropy is not________

(a) State function

(b) Conserved in a reversible process

(c) A function of two thermodynamic variables

(d) Zero always

The question was asked in an interview for internship.

This key question is from A Brief Review of Thermodynamics in chapter Compressible Flow – Preliminary Aspects of Aerodynamics

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The correct choice is (d) Zero always

To explain: The enthalpy is a state function. This is true for all type of gases. It is conserved for a reversible process (since no generation of entropy takes place due to dissipation). From the formula, it is visible that entropy always is a function of two thermodynamic variables (p, T) or (v, T), etc. It is not zero always.

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