The temperature at which the second virial coefficient of real gas is zero is called :

The temperature at which the second virial coefficient of a real gas is zero is called Boyle's temperature.

It is the temperature at which a real gas obeys Boyle's law.

It is given by the expression ${\mathrm{T}}_{\mathrm{B}}=\frac{\mathrm{a}}{\mathrm{bR}}$​ where a and b are the van der Waal's constants.

Boyle's temperature of a gas is always higher than its critical temperature.