fire extinguisher

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A substance that smothers flames or prevents their spreading. Many substances can be used. Liquids include water, sodium hydrogencarbonate solution, chlorinated organic compounds such as tetrachloromethane and carbon dioxide-containing foams. Solid extinguishers, such as sodium or potassium hydrogencarbonate, produce carbon dioxide gas when strongly heated; solid carbon dioxide (dry ice) may also be used.

Subjects: Chemistry.

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