What does a Co2 fire extinguisher remove?

Answer 1

In a carbon dioxide extinguisher, the carbon dioxide is kept in pressurized liquid form in the cylinder. When the container is opened, the carbon dioxide expands to form a gas in the atmosphere. Carbon dioxide gas is heavier than oxygen, so it creates a blanket around the burning fuel and displaces the oxygen surrounding the fuel.

Or to simplify, it removes oxygen from the fire triangle, to smother it and extinguish it.

You also can take out one of the elements by using a wet sack or just a plain blanket

Answer 2

CO2 Fire Extinguisher Features

• CO2 is a non-flammable gas, which is stored in the extinguisher under pressure as a liquid. CO2 fire extinguishers work best for Class B and C fires. Class B fires are caused by flammable or combustible liquids including gasoline or kerosene, or grease as in kitchen fires. Class C fires are those occurring around electrical equipment such as computers, fax machines, wiring and circuit breakers. CO2 is harmless to electrical equipment. The current should be shut off before using the fire extinguisher.