Inversions and Isotherms MET
Inversions and isotherms, with lapse rates that are negative and zero respectively, are the most stable types of atmosphere, meaning air cannot rise once the force is removed. Although there are many causes of inversions, the most common is ground cooling by night (particularly on clear, long, windless nights) - the ground gives off radiation, cools and sucks energy out of the air in contact with it, cooling the air itself.
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What can be said about the stability of the air in an isothermal layer?