What are the constituents of foam …
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Posted by Priyanshu Singh 7 years, 6 months ago
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Yogita Ingle 7 years, 6 months ago
Foam is a type of colloid in which gas is the dispersed phase and solid is the dispersed medium. Foams containing surfactants sodium alkyl sulfate, prfluorooctanesulfonic acid (PFOS) etc.. are used as foam type fire extinguisher.
The container of soda acid fire extinguisher holds a sodium bicarbonate solution. The screw-on cap contains a plunger mechanism which is covered by a safety guard. Below the plunger is a glass phial containing sulphuric acid. When the plunger is struck, the glass phial is broken and the acid and sodium bicarbonate mix together. The resulting chemical reaction produces carbon dioxide gas which pressurises the space above the liquid forcing it out through the internal pipe to the nozzle.
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