Abstract

Air is a mixture of permanent and variable gas components. The most important variable gas component of air is water vapor, which affects the thermodynamic properties (physical constants) of air. In atmospheric thermodynamics, the term ‘moist air’ refers to air that includes the variable water vapor component, as opposed to ‘dry air’ that does not include it. The equation of state for both dry and (unsaturated) moist air is the ideal gas law. Combined with the first and second law of thermodynamics, it describes the thermodynamical processes of (unsaturated) moist air.

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