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

Compression is not a method of heat transfer. Heat transfer occurs through conduction, convection, and radiation, which are the established mechanisms by which thermal energy moves from one body or medium to another.

Conduction involves the direct transfer of heat through material substances when there is a temperature difference. Typically, it occurs in solids where particles are closely packed, allowing them to collide and transfer energy.

Convection is the transfer of heat by the physical movement of fluid (liquid or gas). Warm areas of a fluid rise while cooler areas sink, creating a circulation that facilitates heat transfer.

Radiation, on the other hand, involves the transfer of energy through electromagnetic waves, such as infrared radiation. This method does not require a medium, allowing heat transfer to occur through a vacuum, like the heat we receive from the sun.

Compression, however, relates more closely to a change in volume or pressure of a substance and does not inherently involve the transfer of thermal energy between bodies, making it distinct from the other three methods of heat transfer.