Which one of the following statements is correct for a superheated vapour?

Its pressure is less than the saturation pressure at a given temperature.
Its temperature is less than the saturation temperature at a given pressure.
Its volume is less than the volume of the saturated vapour at a given temperature.
Its enthalpy is less than the enthalpy of the saturated vapour at a given pressure.

Correct answer: Its pressure is less than the saturation pressure at a given temperature.

Solution

A superheated vapor exists at a temperature above its saturation temperature for a given pressure, which means its pressure must be lower than the saturation pressure at that temperature. This characteristic allows superheated vapors to be used in various thermodynamic processes without condensing.

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