Which fire extinguisher is used for flammable liquids?

The choice of a foam or dry chemical extinguisher for flammable liquids is based on the specific properties and behavior of these substances when they catch fire. Flammable liquids can burn rapidly and can also produce intense heat and vapors that facilitate combustion.

A foam extinguisher works by forming a barrier over the surface of the burning liquid, which helps to smother the flames and prevents the release of flammable vapors. This is particularly effective for liquids like gasoline or oil, where it can also prevent re-ignition.

Similarly, dry chemical extinguishers, which can use powdered substances like monoammonium phosphate, interrupt the chemical reaction that sustains the fire. They are versatile and can be used on a variety of fires, including those involving flammable liquids.

In contrast, water-based extinguishers are generally not suitable for flammable liquids, as they can spread the fire or lead to violent reactions. CO2 extinguishers, while effective in some scenarios, may not provide the same level of smothering effect on flammable liquid surfaces as foam or dry chemical extinguishers.

Thus, the effectiveness of foam or dry chemical extinguishers makes them the appropriate choice for fires involving flammable liquids.