Compressibility is a measure of the relative volume change of a fluid or solid as a response to a pressure change. where V is volume and p is pressure Note: most textbooks use the notation for this quantity The above statement is incomplete, because for any object or system the magnitude of the compressibility depends strongly on whether the process is adiabatic or isothermal. Accordingly isothermal compressibility is defined: where the subscript T indicates that the partial differential is to be taken at constant temperature Adiabatic compressibility is defined: where S is entropy.
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