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dry-adiabatic lapse rate

A process lapse rate of temperature, the rate of decrease of temperature with height of a parcel of dry air lifted by a reversible adiabatic process through an atmosphere in hydrostatic equilibrium.

This lapse rate is g/cpd, where g is gravitational acceleration and cpd is the specific heat of dry air at constant pressure, approximately 9.8°C km−1. Potential temperature is constant with height in an atmospheric layer with this lapse rate. 2. The adiabatic lapse rate of unsaturated air containing water vapor.

This differs from definition 1 by the factor

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