Which type of extinguishing agent is more suitable for liquid fires?

Foam is particularly effective for extinguishing liquid fires because it forms a blanket over the surface of the flammable liquid, thereby blocking access to oxygen and cooling the fuel at the same time. This dual action helps to suppress the fire more effectively than other agents. Foam also helps to suppress the potential for re-ignition by preventing flammable vapors from escaping and igniting in the air.

In contrast, water is not suitable for liquid fires, especially with flammable liquids, as it can spread the fire or make it worse by splashing the burning liquid. Dry powder can extinguish various types of fires, but it does not form a protective layer like foam does. Carbon dioxide is effective in smothering minor flammable liquid fires in confined spaces but may not be sufficient for larger or more volatile liquid fires without a technique to cover the liquid surface.