Question

why is carbondioxide used in fire extinguishers?

Answer 1

Carbon dioxide is a non-conductive and non-corrosive gasused to reduce the amount of oxygen available to the fire.

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Answer 2

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