Moist Air - Specific vs. Relative Humidity
Specific humidity of moist air vs. relative humidity, water vapor and air density.
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Humidity is the quantity of water vapor present in air. It can be expressed as an absolute, specific or a relative value.
If we know the relative humidity of the moist air and the water vapor density and the density of the air, the specific humidity can be expressed as:
x = 0.622 φ ρws / (ρ - ρws) 100% (1)
where
x = specific humidity (humidity ratio) of air vapor mixture (kgh2o/kgdry_air)
φ = relative humidity (%)
ρws = density of water vapor (kg/m3)
ρ = density of the moist or humid air (kg/m3)
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