Which type of fire extinguisher is appropriate for flammable liquids?

The correct choice highlights the use of foam or dry powder extinguishers as appropriate for flammable liquids due to their specific properties designed to combat such fire hazards effectively. Foam extinguishers work by forming a blanket over the flammable liquid, preventing oxygen from supporting combustion and cooling the burning surface. This is particularly beneficial for fires involving liquids such as petrol, paints, and solvents.

Dry powder extinguishers, on the other hand, interrupt the combustion process by dispersing a fine powder that not only suppresses the flames but also forms a barrier between the fuel and the fire. They are versatile and can be effective on several types of fire, including those involving flammable liquids.

In contrast, water extinguishers are ineffective against flammable liquid fires because using water may spread the flammable liquid or worsen the situation by creating a larger fire hazard. CO2 extinguishers are suitable for flammable liquids and electrical fires but may not provide the same blanket effect as foam extinguishers. Wet chemical extinguishers are primarily intended for fires involving cooking oils and fats, making them unsuitable for general flammable liquid fires. Thus, foam or dry powder extinguishers remain the best suited for tackling flammable liquid fires effectively.