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A gas has more than one specific heats, ...

A gas has more than one specific heats, whereas a liquid and solid have only one. Why?
OR
Why gas has two principle specific heat capacties.

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The correct Answer is:
A solid or a liquid when heated does not undergo any change in the volume or pressure. But in case of a gas, both the pressure and volume change on heating. Therefore, specific heat of a gas is defined either at constant volume or at constant pressure and hence a gas has two specific heats.
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