# 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 liquefied 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)

Please do not use chat terms. Example: avoid using "grt" instead of "great".