There are several other variables of the atmosphere which concern a meteorologist in his day-to-day work. Amongst these, perhaps, the most important are the wind and the clouds. Unlike the atmosphere in a closed laboratory which can be studied at will, the free atmosphere is constantly in motion. Also, in the open atmosphere, when air temperature decreases adiabatically with height, water vapour carried in the air undergoes change of phase resulting in condensation and formation of fog, clouds, rain or snow, etc.
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