Air and Saturation Pressure
Date: Spring 2012
Can actual air pressure ever be greater than saturation air pressure? If so, how?
To clarify the question, I assume that you are asking whether
air pressure can ever be greater than the air pressure when
the air is saturated. When you add water vapor to the air,
you are adding molecules that have less mass than the molecules that
compose dry air. If the air parcel remained at the same volume and
temperature as the dry air, the air pressure of the saturated parcel
would be greater.
David R. Cook
Climate Research Section
Environmental Science Division
Argonne National Laboratory
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Update: June 2012