Atmospheric static stability for unsaturated air is defined by comparing the environmental (actual) lapse rate to the dry adiabatic lapse rate: a 'neutrally stable' atmosphere is, by definition, one where the environmental lapse rate exactly equals the dry adiabatic lapse rate, so a displaced parcel experiences no restoring or accelerating buoyant force.
A neutrally stable atmosphere is defined as one in which a vertically displaced (unsaturated) air parcel experiences no net buoyant force, which occurs precisely when...
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