What happens to the stability of an air mass when it is warmed from below?

When an air mass is warmed from below, stability decreases. This is due to the fact that warm air is less dense than cooler air, leading to a situation where the warmer air can rise. As the lower layers of the air mass are heated, they become buoyant compared to the cooler air above them. This buoyancy encourages vertical motion, as the warm air wants to rise and cool, thereby promoting instability in the atmosphere.

In terms of atmospheric dynamics, stable air tends to resist vertical motion and does not easily allow for such rising of air bubbles, while unstable air facilitates it. Consequently, warming the air from below disrupts the stability of the air mass, making it more prone to turbulence, convection, and the development of weather phenomena such as clouds and storms.