Enthalpy changes over a constant pressure path are always zero for __________ gas.

A. Any

B. A perfect

C. An easily liquefiable

D. A real

Answer: Option B

Solution(By Examveda Team)

Since a perfect gas can also be considered as an ideal gas and for ideal gas hence at constant pressure the temperature remains constant and for ideal gas since enthalpy is solely a function of temperature we can say enthalpy is zero.