Question

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?

• conduction
• convection
• radiation
• reflection

Explanation:

Step1: Identify heat transfer types

Recall definitions of each option:

• Conduction: Heat transfer through direct contact.
• Convection: Heat transfer via fluid (air/water) movement.
• Radiation: Heat transfer via electromagnetic waves.
• Reflection: Redirection of waves, not heat transfer.

Step2: Match to the scenario

Hot air is less dense, so it rises to the top floor, creating a convection current that makes upper floors hotter. This matches convection.

Answer:

B. convection