The body gives off heat in waves from uncovered surfaces. Which heat transfer mechanism is this?

The body gives off heat in waves from uncovered surfaces. Which heat transfer mechanism is this?

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

Answer: (A)

Heat transfer by waves from uncovered surfaces is radiation. Radiation is the emission of energy as electromagnetic waves, which can travel through air or even through space without a medium. The body naturally radiates infrared energy as its temperature rises. This differs from conduction, which requires direct contact to pass energy through a solid, and convection, which involves heat carried by moving fluids like air or water, and evaporation, which involves a liquid changing to vapor and removing heat. The clue here is the use of waves, pointing to radiation.

Heat transfer by waves from uncovered surfaces is radiation. Radiation is the emission of energy as electromagnetic waves, which can travel through air or even through space without a medium. The body naturally radiates infrared energy as its temperature rises. This differs from conduction, which requires direct contact to pass energy through a solid, and convection, which involves heat carried by moving fluids like air or water, and evaporation, which involves a liquid changing to vapor and removing heat. The clue here is the use of waves, pointing to radiation.