Chemical Engineering Thermodynamics
When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is

More in liquid phase
Replaced by chemical potential which is more in vapour phase
More in vapour phase
Same in both the phases

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Chemical Engineering Thermodynamics
Law of corresponding states says that

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

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