question_answer

Moist air is a mixture of dry air and water vapour. Hence, three independent intrinsic thermodynamic three independent intrinsic thermodynamic properties are required to fix its thermodynamic state. While using psychrometric chart, however, only two thermodynamic properties are needed since, psychrometric chart:

A) Is an approximation to actual properties

B) Assumes that both water vapour and dry air behave like perfect gases

C) Is drawn for actual properties of water vapour and dry air

D) Is drawn for a fixed pressure