Mole Fraction of Water Vapor in Moist Air

The mole fraction of water vapor express the ratio of water molecules to air and water molecules.

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

x_w = n_w / (n_a + n_w) (1)

where

x_w = mole fraction of water vapor

n_w = mole of water

n_a = mole of air

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