The Dry adiabatic lapse rate reference article from the English Wikipedia on 24-Apr-2004
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Dry adiabatic lapse rate

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The dry adiabatic lapse rate is the rate at which the temperature of a parcel of dry air decreases as the parcel is lifted in the atmosphere. The dry adiabatic lapse rate (abbreviated DALR) is 5.5°F per 1000 ft or 9.8°C per km.

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