Question

What is the 'adiabatic lapse' rate for wet air?
A. 06C per 100meter
B. 0.9C per 100meter
C. 0.7C per 100meter
D. 0.5C per 100meter

Answer 1

Hint: Adiabatic lapse is the measure if changing values of temperature with elevation. Wet adiabatic lapse represents that the water content is more and because the process is adiabatic heat exchange is not observed.

Complete answer: Adiabatic lapse air refers to the change in the values of temperature with the changes with the altitude it elevates.
Lapse air depending upon the amount of water present in it can be dry or moist. In dry adiabatic lapse, the amount of water is less while in the wet adiabatic lapse layer the water content is high. The word Adiabatic in the lapse air defines that in this process of lapse, no change or transfer of heat takes place.
The adiabatic lapse of wet air is said to be 0.98C per 100 meters.

Additional information: The traditional description of the adiabatic lapse rate explains that it is due to the change in the internal energy that a parcel experiences when it is compressed without the exchange of heat/ salt.

Hence, the correct option is (B), 0.9C per 100 meters.

Note: Word lapse is used to represent the change in temperatures with elevation as in the case of the earth as the elevation is increased there is a fall in the temperature.