Certified Fire Investigator Practice Exam 2025 – The All-in-One Guide to Master Your Certification!

An accelerant is a substance that is used to increase the rate of combustion and promote the spread of fire. This definition aligns with the understanding of accelerants in the context of fire investigations, where they are often found at the scene of a fire to suggest intentional ignition or arson.

Typically, accelerants are flammable liquids, such as gasoline or lighter fluid, that can evaporate quickly and ignite easily when exposed to heat or a spark. Their presence is critical in investigating the circumstances surrounding a fire, as they can indicate malicious intent.

In contrast, the other options do not accurately represent what an accelerant is. While fuels are indeed related to combustion, the correct definition specifies that accelerants specifically enhance combustion. The mention of oxidizers highlights their role in supporting fire rather than initiating it in a way similar to accelerants. Fire extinguishing agents serve a completely different purpose, aiming to suppress or extinguish flames instead of promoting them. Similarly, fire detection devices are designed to sense heat, smoke, or flames, which is unrelated to the accelerant's role in the combustion process.