Saturation mixing ratio
From Glossary of Meteorology
saturation mixing ratio
A thermodynamic function of state; the value of the mixing ratio of saturated air at the given temperature and pressure.
This value may be read directly from a thermodynamic diagram. Without specific qualification, the saturation mixing ratio refers to saturation with respect to a plane surface of pure water. Saturation mixing ratios may also be specified with respect to a plane ice surface.
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