What should you avoid using on a flammable liquid fire?

Using water on a flammable liquid fire is hazardous and should be avoided for several reasons. Flammable liquids, such as gasoline or oil, do not mix with water; instead, they often float on the surface due to their lower density. When water is applied to such fires, it can spread the burning liquid, leading to a larger fire and more extensive damage. Additionally, the heat from the fire can cause the water to rapidly evaporate, which can create steam and potentially lead to explosive conditions.

In contrast, foam, dry chemical, and carbon dioxide extinguishers are specifically designed to suffocate and cool the flames effectively without exacerbating the situation, making them suitable choices for managing flammable liquid fires.