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

Induction is the correct choice for being not a type of heat transfer in the context of the options provided. Heat transfer typically occurs through three primary mechanisms: conduction, convection, and radiation.

Conduction refers to the transfer of heat through materials by direct contact, where faster-moving particles collide with slower-moving ones, allowing heat to move through solid objects. Convection involves the movement of heat through fluids (liquids and gases), where warmer, less dense parts of the fluid rise while cooler, denser parts sink, creating a circulation pattern. Radiation is the transfer of heat through electromagnetic waves, which can occur even in a vacuum, as it does not require a medium for transfer.

Induction, on the other hand, refers specifically to a technique often used in cooking, where an alternating electric current generates a magnetic field that induces swirling currents within a metallic pot. While induction does involve the transfer of heat, it is not classified under the primary types of heat transfer mechanisms like conduction, convection, or radiation. This distinction makes induction a unique method rather than a heat transfer type, as it relies on magnetic fields to indirectly transfer heat to cookware.