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| Description: The actual amount of water in air is measured directly as the mass of water vapour per unit volume of air. This quantity, the water vapour density, is the numerator in the relative humidity equation and is given either as milligrams of water per litre of air (mg H2O/L) or as grams of water per cubic meter of air (g H2O/m3). The quantity of water vapour that air can potentially hold is its saturation water vapour density, the denominator in the relative humidity equation.
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