The ambient air is stable when the ambient lapse rate is A)Neutrally stable C)Hyper-adiabatic B)Sub-adiabatic D)Super-adiabatic
Option C) the environmental lapse rate is greater than – 5.5 K/km, then there is some small amount of vertical turbulence and the atmosphere is said to be stable. It is also referred to as being sub-adiabatic.
