Firefighter 1C Wildland Practice Exam

What can be used on a wildland or ground cover fire to absorb its heat and cool the fuel?

1. Compressed-air foam system.

2. Liquefied nitrogen.

3. Dry chemical.

4. Dry ice.

The correct answer is: Compressed-air foam system.

A compressed-air foam system is an effective tool for managing wildland or ground cover fires because it combines water with air and a foam concentrate to create a lightweight, stable foam. This foam acts as a blanket over the fire, cooling the fuel and absorbing heat. It enhances the water’s effectiveness by providing a greater surface area and a longer-lasting cooling effect, which helps to prevent reignition of the fire. The expansion of the foam also helps to smother the flames and limit oxygen availability, which is crucial for extinguishing the fire. Liquefied nitrogen, while involved in some cooling applications, is not commonly practical for direct use on wildland fires due to logistical and handling challenges. Dry chemicals are typically used for different types of fires, mainly in structural firefighting, and may not provide the same cooling effect as foam when applied to wildland fuels. Dry ice primarily serves as a cooling agent but does not create a barrier or foam blanket like a compressed-air foam system does, limiting its effectiveness in managing wildland fires.