Question

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"WHY IS CARBON DIOXIDE ALSO KNOWN AS FIRE EXTINGUISHER"?
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Answer 1

CO2 is a colorless and, in normal concentrations, odorless gas. It doesn't react with burning materials, so it doesn't create any toxic or other by-products when used to suppress a fire. It's therefore a clean gas, meaning it leaves no trace of its use when suppressing a fire.
Carbon dioxide doesn't conduct electricity, making it an ideal fire suppressant for use in computer rooms, electrical distribution stations and other locations where a large amount of electricity may be present.
CO2 acts on fires in two ways: The release of the gas under pressure has a cooling effect, as can be seen by the resulting mist cloud and ice particles; the gas also displaces the oxygen that's necessary to maintain combustion.

Answer 2

Carbon dioxide extinguishes fire by displacing oxygen, or taking away the oxygen element of the fire. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well. In absence of oxygen, the fire dies. Therefore, carbon dioxide is also known as fire extinguisher .