A gas can be liquified by pressure alone only, when its temperature is __________ its critical temperature.

Solution (By Examveda Team)

Only below and at the critical point there is strong demarcation in properties of liquids and gases above the critical point we can’t recognize the difference. Hence for a gas which is under or at the critical point can be liquefied. For a gas above critical point can also undergo a pressure change but we can’t notice the difference in properties.