On Thu, 30 Oct 2014 08:37:46 -0700 (PDT),
Jim McGinn , in
wrote:

Meteorology never bothered to measure the main assumption that moist
air is lighter than dry air. It isn't. Moist air is heavier.

Your work showing this is true? let me help you with that:

http://www.engineeringtoolbox.com/mo...air-d_679.html

Water vapor - H2O - is composed of one Oxygen atom and two Hydrogen
atoms. Hydrogen is the lightest element at 1 atomic unit while Oxygen
is 16 atomic units. Thus the water vapor atom has an atomic mass of 18
atomic units. With 18 atomic units water vapor is lighter than
diatomic Oxygen with 32 units and diatomic Nitrogen with 28 units.

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