Which is a type of heat transfer that causes the air at the top floor of a building to be hotter than the air at the bottom floor of a building?

Convection transfers heat through the movement of fluids, including air. Warm air is less dense, so it rises and can make the top floor warmer than the bottom floor. Conduction transfers heat through direct contact, while radiation transfers heat by electromagnetic waves; neither explains the rising warm air as directly.

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