Which of the following is NOT a standard method of heat transfer?

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

Answer: (B)

Energy transfer by heat is usually categorized into three standard modes: conduction through a material by molecular interactions, convection with the bulk motion of a fluid, and radiation through electromagnetic waves. Evaporation, while it involves energy transfer because turning a liquid into vapor requires latent heat, is a phase-change process tied to mass transfer at a surface rather than a basic mechanism of heat movement between bodies. It can occur alongside conduction or convection, but it isn’t itself one of the standard methods of heat transfer. So evaporation isn’t a standard mode of heat transfer.