The dry adiabatic lapse rate should be assumed with a mean value of…
Refer to figure.
Dry Adiabatic Lapse Rate: When dry air (unsaturated air, or air at less than 100% humidity) is forced to rise or descend, it changes temperature at a rate of 3°C per 1000 ft (1°C per 100 m).
Saturated Adiabatic Lapse Rate: When saturated air (at 100% humidity) is forced to rise or descend, it changes temperature by an average of only 1.8°C per 1000 ft (0.6°C per 100 m).
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