Heat transfer through direct contact between a hot surface and another object is best described as which method?

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

Answer: (B)

Direct contact heat transfer is conduction. When a hot surface touches another object, thermal energy moves from the hotter to the cooler material through interactions at the interface—through neighboring particles bumping into each other and, in metals, free electrons carrying energy along. This transfer happens because there is no need for bulk fluid motion or electromagnetic waves; the energy passes directly from one substance to the other via contact. Convection would require moving fluid to carry heat, radiation would transfer heat through electromagnetic waves without contact, and induction refers to generating currents, not a heat-transfer mechanism in this direct-contact context. An everyday example is a hot pan warming a metal spoon placed in it—the energy moves through the spoon by conduction.