What is the term for the explosion or rapid flaming of superheated gases when oxygen is introduced into a confined space?

The term for the explosion or rapid flaming of superheated gases when oxygen is introduced into a confined space is "backdraft." This phenomenon occurs in situations where a fire has depleted the available oxygen in an area, causing combustion to slow down or even become smoldering. When a door or window is opened, fresh oxygen rushes in, which can ignite the accumulated combustible gases in an explosive manner.

This rapid transition from a low-oxygen to a high-oxygen environment can lead to a violent reaction, making it particularly dangerous for firefighters and occupants. Understanding backdraft is crucial in fire safety and response, as recognizing the indicators leading up to it can help prevent catastrophic flashovers.

The other terms mentioned have distinct meanings in firefighting. Flashover refers to the rapid spread of fire throughout an entire room or space, rollover signifies the ignition of flammable gases at the ceiling level, and firestorm describes a large, intense fire capable of producing its own wind system. Each term describes different behaviors and conditions in fire dynamics, highlighting the importance of understanding the specific terminology in fire safety training.