Which of these is a characteristic of warm air?

A. It transfers energy through radiation.

B. Its molecules are far apart.

C. It sinks due to convection.

D. It cools the land below it.

The answer is B. The air molecules of warm air have high energy and therefore collide with high energy. This causes them to move away from each other with increased temperatures. This is another reason why heating air in a closed container results to high pressure with increased heating.