Discussion
Assertion (A): For a real fluid the difference between the two heat capacities is expressed using expansivity and compressibility.
Reason (R): The general relation follows from a Maxwell relation and reduces to the gas constant for an ideal gas.
Answer: D
Both are true and the reason connects the general and the special case: the ideal gas result is not a separate rule but the limit of the general one when the equation of state is simple. Expansivity and compressibility are both measurable quantities.
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