Chemical Engineering Thermodynamics
Law of corresponding states says that

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

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Chemical Engineering Thermodynamics
The necessary and sufficient condition for equilibrium between two phases is

The chemical potential of each component should be same in the two phases
The temperature of each phase should be same
The concentration of each component should be same in the two phases
The pressure should be same in the two phases

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