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  4. If CP and CV are the specific heats for a gas at constant pressure and at constant volume respectively, then the relation CP - CV = R is exact for

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Q. If $C_P$ and $C_V$ are the specific heats for a gas at constant pressure and at constant volume respectively, then the relation $C_P$ - $C_V = R$ is exact for

AIIMSAIIMS 1994Thermodynamics

Solution:

$C_{p}-C_{v}=R$ is exact for ideal gas. It is nearly true for real gases at moderate pressure.