environmental lapse rate
Also found in: Dictionary, Acronyms.
environmental lapse rate[in¦vī·ərn¦mənt·əl ′laps ‚rāt]
The rate of decrease of temperature with elevation in the atmosphere. Also known as atmospheric lapse rate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
environmental lapse rate (ELR)
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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved