How the fire extinguisher is useful to control the Fire
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inside, a fire extinguisher is quite like a giant aerosol can, often with two different substances inside. One of them is a solid, liquid, or gas substance for fighting the fire. The other one is called a propellant and is a pressurized chemical that makes the fire-fighting substance come out when you press the extinguisher handle. Have you noticed that fire extinguishers are always really strong steel canisters? That because the propellant is stored inside at a high pressure. Strong canisters are needed to stop the extinguishers exploding!
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Fire extinguishers release a foam which form a barrier between a burning object and the oxygen present in the air. When the oxygen supply is cut off, the fire is extinguished.
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