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kilometer ascent indicates stability, while greater changes indicate instability. This lapse rate is known as the dry adiabatic lapse rate. When the environmental lapse rate is less than the adiabatic lapse rate, an air parcel that undergoes adiabatic change of pressure will eventually be colder and thus denser than the surrounding air, causing it to descend to its initial pressure. When the environmental lapse rate is greater than the dry adiabatic lapse rate, air parcels are warmer and less dense than the surrounding air, causing them to

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