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

Convection, conduction, and radiation are all recognized methods of heat transfer.

Conduction involves the direct transfer of heat through a material without the movement of the material itself, typically occurring in solids where heat flows from the hotter area to the cooler area through molecular interaction.

Convection refers to the transfer of heat via the movement of fluids (liquids and gases). As a fluid is heated, it becomes less dense and rises, while cooler, denser fluid descends, creating a circulation pattern that distributes heat.

Radiation is the transfer of heat in the form of electromagnetic waves, which can occur in a vacuum. This is how the sun's heat reaches the Earth despite the empty space in between.

Condensation, while it does involve a release of heat during the phase change from gas to liquid, it is not a method of heat transfer itself. Rather, it is a process that involves the phase change of a substance. Therefore, it does not fit into the category of heat transfer methods like conduction, convection, and radiation. Recognizing the unique nature of these processes is essential in understanding thermodynamic principles in power engineering.