Question

what 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 of a building?

Explanation:

Convection is a heat - transfer mechanism where warmer, less - dense air rises and cooler, denser air sinks. In a building, this can cause the air at the top floor to be hotter as warm air rises. Conduction is the transfer of heat through direct contact, and radiation is the transfer of heat through electromagnetic waves. Neither of these typically cause the top - floor air to be hotter in the same way as convection in a building context.

Answer:

Convection