The rate of decrease in temperature with increase in altitude of an air parcel which
is expanding slowly to a lower atmospheric pressure without exchange of heat; for
a descending parcel it is the rate of increase in temperature with decrease in altitude.
Theory predicts that for dry air it is equal to the acceleration
of gravity divided by the specific heat of dry air at constant pressure (approximately
). The moist adiabatic
lapse rate is less than the dry adiabatic
lapse rate and depends on the moisture content of the air mass.
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2171
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook