Name the three modes of heat transfer.

• A. Conduction, convection, and radiation
• B. Radiation, evaporation, and conduction
• C. Conduction and convection only
• D. Convection and radiation only

Answer: (A)

Heat can move in three ways: conduction through solids where energy spreads by particle interactions and free electrons; convection in liquids and gases driven by the bulk movement of the fluid; and radiation, which transfers energy as electromagnetic waves and can occur even in a vacuum. These three together cover how heat travels in most situations.

The option that includes evaporation isn’t a separate mode of heat transfer; evaporation is a phase-change process that involves heat transfer but isn’t considered one of the three fundamental modes. The other choices omit one of the three modes, so they don’t fully describe how heat moves. Therefore, conduction, convection, and radiation is the complete and correct set.