What stage of a fire is defined as the moment when all surfaces and objects have reached their ignition temperature?

Flashover refers to a critical stage in a fire's progression where all combustible materials in the room have reached their ignition temperature and ignite almost simultaneously. This phenomenon occurs when the temperature in an environment rises rapidly, creating an intensely hot atmosphere.

During flashover, the heat generated by the fire causes surrounding materials to reach their threshold for combustion. This marks a significant transition in the fire dynamics, as the entire room can become engulfed in flames within seconds, leading to a drastic increase in fire intensity and danger.

Understanding flashover is crucial for fire officers and firefighters because it dramatically changes firefighting strategies and tactics. Recognizing the signs that a flashover is imminent can help ensure proper precautions are taken to protect personnel and improve overall response effectiveness.