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The inversion temperature of a gas is the temperature

Aat which the Joule-Thomson coefficient changes sign
Bat which the gas liquefies
Cat which $Z$ is minimum
Dabove which the gas cannot exist

Answer: A

Below

T_{i}

the Joule-Thomson coefficient is positive (cooling on expansion); above it the coefficient is negative (heating).

T_{i}

is the temperature at which the sign changes, given by

2 a / R b

for a van der Waals gas.

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