Chemical Engineering Thermodynamics
Law of corresponding states says that

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

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Chemical Engineering Thermodynamics
Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which

Two liquids are completely separated into two layers
A homogeneous solution (say of phenol water) is formed
None of these
Mutual solubility of the two liquids shows a decreasing trend

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