What is the best method of putting out a gasoline fire?

Using a carbon dioxide extinguisher is the best method for putting out a gasoline fire due to its effectiveness in suffocating the flames and interrupting the chemical reactions necessary for combustion. Carbon dioxide works by displacing oxygen around the fire, which is crucial because fire requires oxygen to sustain itself. Since gasoline fires are highly flammable and can spread rapidly, it is essential to use an extinguishing method that can quickly eliminate the fire without exacerbating the situation.

Foam extinguishers are also effective against petroleum-based fires as they form a blanket over the fuel, preventing vapors from igniting. However, their application requires careful usage to ensure complete coverage of the flaming liquid. Water extinguishers are unsuitable for gasoline fires because water can spread the fuel and worsen the fire. Dust extinguishers may not provide adequate suppression for liquid fires, as they are typically more effective for solid combustibles.

In summary, carbon dioxide extinguishers efficiently cool and displace oxygen from the fire area, making them the preferred choice for gasoline fires.