Heat transfer: convection
A radiator warms a room as heated air rises and cooler air sinks to replace it. This heat transfer is mainly:
Answer D: explanation for every choice
A
Conduction is heat transfer through direct contact, without bulk flow.
B
Radiation is energy carried by electromagnetic waves and needs no medium.
C
Evaporation removes heat by vaporizing a liquid and is not how the room is warmed.
D
Correct. Convection is heat carried by the bulk movement of a fluid.
TakeawayConduction: contact. Convection: moving fluid. Radiation: electromagnetic waves.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID cp74.