Which type of fire extinguisher is suitable for use on combustible liquids?

Foam extinguishers are specifically designed to combat fires involving combustible liquids, such as oils and fuels. The foam works by creating a barrier between the fuel and the oxygen in the air, effectively smothering the fire and preventing re-ignition. This makes them particularly effective for flammable liquid fires, as the foam adheres to the surface of the liquid, suppressing the flames and cooling the burning material.

In contrast, water extinguishers can spread flammable liquids and are not suitable for such fires, as water does not provide the necessary interaction to extinguish the flames effectively. Powder extinguishers are versatile and can handle various types of fires, including those involving combustible liquids; however, they may not be as effective as foam extinguishers in controlling such fires. CO2 extinguishers can extinguish liquid fires but may not provide the same cooling effect or prevent re-ignition as foam extinguishers. Thus, foam extinguishers remain the most appropriate choice for fires involving combustible liquids.