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4. The isothermal compressibility B is defined as 1 jav This quantity measures the fractional change in volume when the pressure is increased slightly, while the temperature is held constant. Derive an expression for the isothermal compressibility for the van der Waals gas. You may make use of the reciprocity relation ag ах y.2 ag у,2 Caution: Be mindful of which variables must be held constant on both sides.
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