Saturation level

saturation level

The altitude (and its corresponding pressure P_sat) to which an air parcel must be lifted dry-adiabatically or lowered moist-adiabatically to be just saturated (100% relative humidity with no liquid water present).

For unsaturated air, this is commonly known as the lifting condensation level. Saturation level is a conserved variable that does not change during adiabatic lifting or lowering of saturated or unsaturated air and can thus be used as a tracer for that air parcel. When paired with the corresponding saturation air temperature at that altitude, the result is a saturation point that can be represented on a thermodynamic diagram.

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An imaginary volume of air to which may be assigned any or all of the basic dynamic and thermodynamic properties of atmospheric air.

1. A measure (or condition) of height, especially of great height, as a mountain top or aircraft flight level.