Heat transfer through electromagnetic waves is known as

• A. Radiation
• B. Conduction
• C. Convection
• D. Transmittance

Answer: (A)

Radiation is the transfer of heat by electromagnetic waves. This mode doesn’t require any material to carry the energy, so heat can move through air or even empty space. In a fire, radiant heat travels from flames and hot surfaces to objects at a distance, warming them without direct contact. Conduction needs solid contact for energy transfer through particle interactions, and convection relies on the movement of fluids. Transmittance describes how much radiation passes through a material, not how heat is transferred. So the term that matches heat transfer through electromagnetic waves is radiation.