LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Variables Related to Partial Derivatives
The isothermal compressibility κ T is defined by
The factor 1/V is included so that the
compressibility is an intensive variable. The fact
that T and n are fixed in the differentiation means
that measurements of the isothermal
compressibility are made on a closed system at
constant temperature. It is found
experimentally that the compressibility of any
system is positive. That is, every system
decreases its volume when the pressure on it is
increased.
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