Which stage is characterized by rapid flame spread and increasing heat release?

Which stage is characterized by rapid flame spread and increasing heat release?

• A. Incipient
• B. Growth
• C. Fully Developed
• D. Decay

Answer: (B)

The growth stage is defined by rapid flame spread and increasing heat release because, once ignition has started, more fuels in the environment reach their ignition temperatures and begin burning. This causes the flame front to advance quickly through the compartment, igniting additional fuels and producing more combustible gases that feed the fire. The result is a rising rate of heat release and faster fire growth, as opposed to the incipient stage where flames are just forming with lower heat release, the fully developed stage where all available fuels are burning at near-maximum rate, and the decay stage where fuels are exhausted and heat output declines.

The growth stage is defined by rapid flame spread and increasing heat release because, once ignition has started, more fuels in the environment reach their ignition temperatures and begin burning. This causes the flame front to advance quickly through the compartment, igniting additional fuels and producing more combustible gases that feed the fire. The result is a rising rate of heat release and faster fire growth, as opposed to the incipient stage where flames are just forming with lower heat release, the fully developed stage where all available fuels are burning at near-maximum rate, and the decay stage where fuels are exhausted and heat output declines.