Moist Air and Degree of Saturation
Humidity ratio of moist air to humidity ratio of saturated moist air
Degree of Saturation is the ratio of the humidity ratio of moist air - to the humidity ratio of saturated moist air at the same temperature and pressure.
The Degree of Saturation can be expressed as
μ = x / xs (1)
where
μ = degree of saturation
x = humidity ratio of the air (kgh20/kgdry_air)
xs = humidity ratio of the air at saturation at the same temperature and pressure (kgh20/kgdry_air)
The degree of saturation can also be expressed as:
μ = φ (pa - pws) / (pa - pw) (2)
where
μ = degree of saturation
φ = relative humidity (%)
pw = vapor pressure (mbar)
pws = saturation vapor pressure at the actual dry bulb temperature (mbar)
pa = atmospheric pressure of moist air (mbar)
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