What are the four stages of fire development?

The four stages of fire development are indeed Ignition, growth, fully developed, and decay. Understanding these stages is fundamental to fire behavior and firefighting tactics.

In the ignition stage, a fire begins when enough heat is produced to ignite combustible material. This is the critical starting point where the right combination of heat, fuel, and oxygen comes together.

During the growth stage, the fire gains intensity and spreads as more fuel becomes available and the temperature rises. This is the time when fire starts to create its own heat and can grow quickly, making it a crucial moment for firefighters to intervene.

The fully developed stage signifies that the fire has reached its peak intensity. In this stage, the fire is consuming the maximum available fuel, producing significant heat and flames. Understanding this stage helps firefighters recognize the danger level and the potential for flashover.

Finally, the decay stage occurs when the fire starts to diminish. This happens when fuel is nearly consumed or when factors such as a decrease in oxygen or increase in humidity reduce the fire's intensity. Recognizing this stage helps firefighters assess the fire's status and plan for extinguishment.

The other choices do not accurately represent the systematic progression of fire development, which makes option A the only correct answer in defining the typical phases