environmental lapse rate

The lapse rate in the surrounding air within which a volume of air is being lifted. The average rate is 2°C/1,000 ft. This should not be confused with dry adiabatic lapse rate (DALR) and saturated adiabatic lapse rate (SALR), in which the lapse rates are fixed. See also dry adiabatic lapse rate and saturated adiabatic lapse rate.

Aviation dictionary. 2014.

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