Dear Student

where, p is the pressure,  is the molar volume of the gas, T is the temperature, and R is the gas constant.

For an ideal gas the compressibility factor is Z = 1 per definition

The reduced temperature and pressure are defined as:

 and 

Tc and Pc are known as the critical temperature and critical pressure of a gas. They are characteristics of each specific gas with Tc being the temperature above which it is not possible to liquify a given gas and Pc is the minimum pressure required to liquify a given gas at its critical temperature.

 and 

now you can eliminate T and P and put in terms of critical temp and pressure.

All the best.                                                           

AKASH GOYAL

AskiitiansExpert-IIT Delhi

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