Question

define critical temperature,critical pressure and critical volume of gas?
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Answer 1

Answer:

Gases can be converted to liquids by compressing the gas at a suitable temperature. ... The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied, no matter how much pressure is applied. Every substance has a critical temperature.

Answer 2

Answer: 

Critical Temperature ($T_{c}$) :

• Critical temperature of a gas may be defined as that temperature above which  the gas cannot be liquefied however high the pressure may be applied. 

Critical Pressure ($P_{c}$) :

• At critical temperature, a certain pressure is needed to liquefy the gas. So, this pressure at critical temperature is called the critical pressure.

Critical Volume ($V_{c}$) :  

• The volume occupied by one mole of a gas at its critical temperature and critical pressure is known as the critical volume.