adiabat
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(′ad·ē·ə′bat)
(meteorology) The relatively constant rate (5.5°F/100 feet or 10°C/kilometer) at which a mass of air cools as it rises.
Oxford Dictionary of Geography:
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adiabat
A line plotted on a thermodynamic diagram, usually on a tephigram, showing as a continuous sequence the temperature and pressure states of a parcel of air with changing height. Dry adiabats show temperature change at the dry adiabatic lapse rate.
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