Tennessee Firefighter 64-Hour Final Practice Test 2025 – Complete Prep Guide

For a fire to occur, all three components—fuel, heat, and oxygen—must be present. This concept is foundational in fire science, often illustrated by the fire triangle.

Fuel is any combustible material that can ignite and sustain a fire. Heat raises the material to its ignition temperature, and oxygen, which is typically present in the air, supports the chemical reactions that produce fire. If any one of these components is missing, combustion cannot occur, and a fire cannot ignite.

Thus, acknowledging that fire requires the interaction of fuel, heat, and oxygen is crucial for understanding fire behavior and prevention. This holistic view is critical for firefighters and others in emergency situations because it informs how to control or extinguish a fire by removing one or more of these essential elements.