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Dry Adiabatic Lapse Rate
Also from: DALR
The dry adiabatic lapse rate refers to the temperature change in a parcel of unsaturated air as it rises (or the pressure is reduced). The reduction in pressure allows the air to expand, and therefore cool.
DALR ≈ 3° / 1,000'
See also
Saturated Adiabatic Lapse Rate