Phoenix Fire Department (PFD) Written Practice Exam

The term "fire triangle" refers specifically to the three essential components that must be present for a fire to ignite and sustain itself: heat, fuel, and oxygen.

- Heat is the energy that raises the temperature of the material to its ignition point.

- Fuel is any combustible material that will react with oxygen to produce fire.

- Oxygen is the oxidizing agent that supports the combustion process.

When these three elements are combined in the right conditions, a fire can occur. Removing any one of these components will extinguish the fire. This concept is fundamental to understanding fire dynamics and is critical for effective firefighting and fire prevention strategies. Understanding the fire triangle helps firefighters develop tactics to control and mitigate fire situations effectively.