Chemical Engineering Thermodynamics
At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by(where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)

μ° + R/T lnf
μ° + T lnf
μ°+ R lnf
μ° + RT ln f

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Chemical Engineering Thermodynamics
Law of corresponding states says that

, two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same
The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature
No gas can be liquified above the critical temperature, howsoever high the pressure may be
The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)

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