Moist Air - Mole Fraction of Water Vapor
The mole fraction of water vapor is the ratio of the number of mole of water vapor in the moist air - to the total number of mole of dry air and water vapor.
The mole fraction of water vapor in moist air can be expressed as
xw = nw / (na + nw) (1)
where
xw = mole fraction of water vapor
nw = mole of water
na = mole of air
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