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

The correct answer is D, as compression is not a type of heat transfer.

Heat transfer refers specifically to the ways in which thermal energy moves from one substance to another or within a substance. The three primary mechanisms of heat transfer are convection, conduction, and radiation.

Convection involves the movement of heat through fluids (liquids and gases) as warmer, less dense areas rise and cooler, denser areas sink, creating a circulation pattern. This method is significant in fire dynamics, as it plays a crucial role in spreading heat through a fire scene.

Conduction refers to heat transfer through direct contact between materials, where heat moves from the hotter object to the cooler one without the movement of the material itself. This occurs in solids and is vital for understanding heat transfer in structural fires.

Radiation is the transfer of heat in the form of electromagnetic waves, which can occur through empty space. This means that heat can be transferred without any direct contact, such as how we feel the warmth of the sun on our skin.

In contrast, compression refers to the reduction in volume and increase in pressure of a gas or liquid, which does not involve the transfer of heat but rather a change in physical state or phase. Therefore, it does not qualify