What happens to air when there are temperature differences?

When there are temperature differences, warm air tends to rise because it is less dense than cool air. This characteristic of warm air creates a displacement effect, where the rising warm air pushes cooler air downward to occupy its place. This process facilitates the movement of air and is essential for creating convection currents, which can help in the transfer of heat within a space.

Choosing the answer stating that warm air displaces cooler air accurately reflects the principles of air movement due to thermal differences. The dynamics of warm and cool air are governed by their respective densities, and as warm air rises, it naturally leads to a scenario where cooler air moves in to fill the space left behind, thus sustaining an ongoing air circulation system. This understanding is fundamental in various applications like heating, ventilation, and air conditioning as well as in weather patterns.