Firefighter Practice Exam

The thermal transmission of fires is primarily facilitated through the processes of conduction, radiation, and convection.

Conduction is the transfer of heat through direct contact of materials. This occurs when heat moves from a hotter to a cooler object, which is particularly relevant in firefighting as heat can be transferred through structural elements or equipment.

Radiation involves the emission of energy in the form of electromagnetic waves. In the context of fire, it allows heat to be transferred through the air and can even affect objects at a distance from the flames.

Convection is the transfer of heat through fluids (liquids and gases) due to the movement of the fluid itself. As hot air or liquid rises, it displaces cooler air or liquid, creating circulation that can spread heat over a larger area.

"Association," on the other hand, does not describe a method of thermal transmission associated with fires. It does not pertain to the physical processes through which heat is transferred. Therefore, it is correct to say that thermal transmission of fires occurs by conduction, radiation, and convection, but not by association.