Certified Fire Investigator Practice Exam

What happens during the rapid pyrolysis phase?

1. Flammable gases are released

2. Char formation begins

3. Heat is no longer absorbed

4. A fire is completely extinguished

The correct answer is: Flammable gases are released

During the rapid pyrolysis phase, flammable gases are released as organic materials such as wood or other fuels undergo thermal decomposition. This phase occurs when the temperature increases significantly, leading to the breakdown of chemical bonds within the fuel. The process of pyrolysis transforms solid materials into gaseous products and charcoal, which can ignite and contribute to the development of a fire. As temperatures rise, the rapid release of volatile compounds can create an environment where ignition occurs more easily, facilitating the spread of fire. Understanding this phase is crucial for fire investigators because the release of these flammable gases plays a significant role in both the growth and behavior of the fire, impacting both safety measures and investigation procedures. In contrast, char formation, heat absorption, and extinguishing a fire pertain to different stages or processes that do not specifically capture the essence of rapid pyrolysis, emphasizing that the release of flammable gases is a defining characteristic of this phase.