Critical Conditions and Liquefaction OF Gases,illustrations

Critical Phenomenon and Liquification of gases

Boyle's Temperature || Critical Phenomena-Liquefaction OF Gases || Critical Temperature || Critical Pressure and Critical Volume

Which of the following represent the suitable conditions for the liquefaction of gases ?

Assertion: Andrews worked on a temporary gas (so called at that time) and derived the condition to liquefy the permanent gases (so called at that time). Reason: Andrews studied isotherms of CO_(2) and obtained the required conditions of liquefaction of gas as T gas lt Tc (critical temperature).

What is critical temperature ? What is its importance in liquefaction of gases?

Variation OF compressibility factor with temperature || Liquefaction OF gases & andrew's isotherms,critical temperature,pressure & volume

Under what two conditions liquefaction of so called pemanent gases can be camed out ?