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Fire extinguisher

extinguishers co2 provide carbon

Fire extinguisher, portable appliance for putting out small fires. Extinguishers work either by cooling or by depriving the fire of oxygen (as typified by the simplest, a bucket of water or sand), and most do both. The soda-acid extinguisher contains a sodium bicarbonate solution and a small, stopped bottle of sulfuric acid. Depression of a plunger shatters the bottle, mixing the chemicals so that carbon dioxide (CO2) gas is generated, forcing the water out of a nozzle. Foam extinguishers employ a foaming agent (usually animal protein or detergent) and an aerating agent. They are effective against oil fires, as they float on the surface. Carbon dioxide extinguishers provide a smothering blanket of CO2. Dry chemical extinguishers provide a powder consisting mainly of sodium bicarbonate, from which the fire's heat generates CO2.

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