Moist Air and Degree of Saturation

The ratio of humidity ratio of moist air to humidity ratio of saturated moist air - the Degree of Saturation

Degree of Saturation is the ratio of humidity ratio of moist air - to humidity ratio of saturated moist air at the same temperature and pressure.

The Degree of Saturation can be expressed as

μ = x / x_s         (1)

where

μ = degree of saturation

x = humidity ratio of the air (kg/kg)

x_s = humidity ratio of the air at saturation at the same temperature and pressure (kg/kg)

The degree of saturation can also be expressed as:

μ = φ (p_w - p_ws) / (p_a - p_w)         (2)

where

μ = degree of saturation

φ = relative humidity (%)

p_w = vapor pressure (mbar)

p_ws = saturation vapor pressure at the actual dry bulb temperature (mbar)

p_a = atmospheric pressure of moist air (mbar)

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