Question

Why does cold air exert more pressure than warm air?

Answer 1

Cold water exerts more pressure than warm air as cold air is denser than warm air while warm air is lighter and less denser than warm air so less pressure is exerted.

Answer 2

In warm air, molecules are spaced farther apart. As air cools, molecular activity and movement slows down which cause compaction of the molecules. The increased density of air in the same space automatically increases the overall weight. That is why warmer air layers over cold air because the cold air is 'heavier' and sinks to the ground while the 'lighter', warm air rises.