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(B) At high pressure,the volume $V$ is very small. The term $\frac{a}{V^2}$ becomes large,but compared to high pressure $P$,it can be neglected. Thus,

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Decreases with increase in temperature.

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(B) At high pressure,the volume $V$ is very small. The term $\frac{a}{V^2}$ becomes large,but compared to high pressure $P$,it can be neglected. Thus,the van der Waals equation modifies as follows: $P(V - b) = RT$ $PV = RT + Pb$ $\frac{PV}{RT} = 1 + \frac{Pb}{RT}$ $Z = 1 + \frac{Pb}{RT}$ Since $Z > 1$,the compressibility factor is greater than one and it decreases as the temperature increases.

What is the compressibility factor of a gas at high pressure?

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