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Moist Air - 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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