Q: What property of warm air causes it to rise above cold air?


Read this paragraph and choose the correct option from the provided answers:

The warm-air vent is placed near the floor of the room. Warm air is less dense than cold air so it rises. If the warm-air vent were placed near the ceiling instead, how would this affect the transfer of thermal energy throughout the room?.

 Choices:

- greater pressure

- greater density

- higher temperature

- lower density


A:
lower density