Since the cool air has a greater downward force than the adjacent warm air, the cool air displaces the warm air. This process is called convection . Each cubic metre of warm air will experience a 1N upward force. Convection in the atmosphere is complicated by two important factors. The pressure of the atmosphere decreases with increasing altitude.
Convection is halted.
In this condition the atmosphere is said to be stable . The atmosphere contains water vapour. Water vapour contains an enormous amount of latent heat. When humid air rises it expands and cools. When the air has cooled enough, clouds form and an enormous amount of latent heat is released through condensation .