Basic Firefighter Written Practice Exam

Which process of heat transfer occurs due to direct contact with a heat source?

1. Convection

2. Conduction

3. Radiation

4. Compression

The correct answer is: Conduction

Conduction is the process of heat transfer that occurs when two objects are in direct physical contact with each other. In this process, thermal energy moves from the hotter object to the cooler one, resulting in a transfer of heat through the material of the objects involved. This is fundamental in firefighting, as firefighters may encounter situations where they must work in close proximity to heated surfaces or materials. Understanding conduction helps firefighters recognize the risks associated with handling tools or materials that may have absorbed heat from a fire. In contrast, convection refers to the transfer of heat through fluids (liquids or gases) caused by the movement and mixing of the fluid itself, while radiation involves the transfer of heat in the form of electromagnetic waves, which can occur without direct contact or a medium. Compression is not a method of heat transfer but rather can refer to the reduction in volume of a substance under pressure. Thus, conduction is specifically applicable in the context of heat transfer by direct contact with a heat source.