Which of the following is NOT a type of heat transfer?

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

Answer: (B)

Heat transfer occurs through three classic modes: conduction, convection, and radiation. Evaporation is not a mode of heat transfer; it’s a phase-change process at a surface where liquid becomes vapor. When heat is supplied, molecules gain enough energy to overcome intermolecular forces and escape into the gas phase, which uses latent heat of vaporization. This can drive cooling of the remaining liquid, but it doesn’t describe how heat moves from one place to another. So evaporation isn’t categorized as a type of heat transfer, even though it often accompanies heat transfer as energy is added to the liquid.