In the progression of a fire, which stage corresponds to the appearance of flames?

• A. Incipient
• B. Decay
• C. Flame
• D. Fully developed

Answer: (C)

Fire progresses through stages, starting with ignition and a period where flames may not yet be visible. The moment flames first become visible marks the transition to the flame or growth stage, where the fire rapidly increases in size and heat release. This is distinct from the incipient stage, which is the very start with ignition and little visible flame; from the fully developed stage, where the fire has reached its maximum intensity and involves most of the room; and from the decay stage, where fuel is exhausted and flames diminish. So, the appearance of flames signals that the fire has entered the flame (growth) stage, not the earlier incipient phase or the later fully developed or decaying phases. In practice, spotting flames means escalation of response: prompt alarm, containment, and safe evacuation decisions become critical as conditions deteriorate quickly.