Critical Pressure of a Liquid is the Pressure

Answer: 3. Above which liquid becomes vapour 

The critical pressure of a liquid is the pressure above which liquid becomes vapor.

Solution:

It is described as the pressure/temperature at which a liquid transforms into a vapour with no distinction between the liquid and gaseous phases. Zero degrees of freedom exist at critical pressure. The dryness fraction becomes undefined and latent heat decreases to zero at a critical pressure. Hence critical pressure of a liquid is the pressure above which liquid becomes vapour.

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