Which of the following best describes an 'accelerant'?

An accelerant is best described as any fuel, typically an ignitable liquid, that promotes or initiates fire growth. This definition highlights the role of accelerants in enhancing the intensity or rapidity of a fire by providing additional, easily ignitable materials. Common examples of accelerants include gasoline, lighter fluid, and other petroleum-based products. They are often used intentionally in arson or unintentionally in situations where flammable materials contribute to the spread of fire.

Understanding this concept is essential for fire investigators who assess fire scenes to determine causes and contributions to fire development. The other options do not accurately represent the role of an accelerant. While one option refers to extinguishing a fire, accelerants do the opposite by fueling a fire. Another option discusses chemicals that cool fires, which is unrelated to the function of an accelerant. The final option mentions objects that reduce the spread of fire, which is contrary to what accelerants do; they typically increase fire spread rather than decrease it.