Certified Fire Investigator Practice Exam

What is the outcome of deflagration compared to detonation?

1. Deflagration occurs rapidly, and detonation slower

2. Deflagration travels slower than sound, while detonation travels faster

3. Detonation only occurs in confined spaces

4. Deflagration is a type of fire while detonation is an explosion

The correct answer is: Deflagration travels slower than sound, while detonation travels faster

The chosen answer highlights the key difference between deflagration and detonation in terms of their rates of propagation. Deflagration is a combustion process that occurs at subsonic speeds, which means it travels slower than the speed of sound in air. This behavior results in a relatively lower intensity of the explosion and is often characterized by a more controlled release of energy, typically producing heat and light. In contrast, detonation occurs at supersonic speeds, traveling faster than sound. This rapid propagation leads to a much more violent and destructive release of energy, generating shock waves that can result in significant damage. Understanding this distinction is crucial for fire investigators, as the nature of an explosion can reveal important information about the materials involved and the conditions present at the time of the incident. Knowing that deflagration is a slower process allows professionals to better assess fire dynamics and potential hazards during an investigation.