What is the first phase of fire development called?

The first phase of fire development is known as the ignition phase. This phase begins when a heat source ignites combustible materials, which can include gases, solids, or liquids. During this phase, the fire is small and may only involve a few combustible materials. The ignition phase is critical because it sets the stage for subsequent phases of fire development. Once ignition occurs, the fire transitions into the growth phase, where the fire grows rapidly due to increased heat, flame, and smoke production.

Understanding the ignition phase is essential for fire inspectors, as it allows them to identify the specific circumstances that lead to a fire's start. Recognizing early signs of ignition can assist in fire prevention strategies and improve safety measures within structures.