Which fire phenomenon occurs when a fire receives a new source of oxygen and rapidly resumes combustion?

The phenomenon that occurs when a fire receives a new source of oxygen and rapidly resumes combustion is known as backdraft. When a fire burns in an enclosed space, it consumes the available oxygen, and as this oxygen level decreases, the fire may smolder or go out. If a window or door is suddenly opened, fresh oxygen can enter the environment, allowing the residual hot gases (which may have accumulated and been in a state of superheated combustion) to ignite almost instantaneously. This results in an explosive resurgence of fire.

Understanding backdraft is crucial for firefighters and facility fire brigade members as it poses significant hazards during fire suppression operations. Proper training on recognizing the signs of backdraft—such as smoke color, volume, and movement—can help prevent injury or fatalities during firefighting efforts.