Heat transferred from one body to another by direct contact of the two bodies or by an intervening heat-conducting medium is called _______

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

Answer: (C)

Heat transfer by direct contact or through a conducting medium is conduction.

Conduction happens when there’s a temperature difference and energy moves through matter by particle interactions. In solids, neighboring particles collide and pass kinetic energy along; in metals, free electrons quickly shuttle energy from the hot region to the cooler region. When two objects touch or are linked by a material that conducts heat, energy flows through that contact or through the conducting medium without the bulk movement of the fluid.

Convection, by contrast, needs moving fluid to carry heat with it, like warm air rising or water circulating. Radiation transfers heat via electromagnetic waves and can occur through empty space. Advection is about transport by the bulk movement of a fluid, which is a form of heat transfer often linked to convection but not the mechanism described here.