When the normal lapse rate and the adiabatic lapse rate intersect, an air mass stops rising at the troposphere's lowest level.
What do you mean by lapse rate, normal, and adiabatic lapse rate? The rate at which temperature in the earth's atmosphere falls with altitude is called as lapse rate. It is assumed for every 165m rise in altitude, there is a decrease of 1 degree celsius in temperature.
This lapse rate is normal. Whereas adiabatic lapse rate is when the temperature of an air mass decreases as it expands while going up. And when these two lapse rate intersects, in another word equal air mass stop rising at the lowest level in the troposphere.
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