Question

Give two reasons why carbon(iv)oxide is used as a fire extinguisher. (1mark)

Answer 1

Explanation:

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.

Answer 2

Carbon dioxide is used as a fire extinguisher because of the following reasons -

• Fire is sustained when three elements, namely, oxygen, fuel, and heat. are present together.
• Removal of one of more than elements of the fire triangle the fire will stop.
• Carbon dioxide is a non-inflammable gas.
• When carbon dioxide gas is supplied at the place of fire, it replaces oxygen so that oxygen gas cannot come in contact with fire, Combustion of fuel can only occur in the presence of oxygen gas.
• The absence of oxygen causes the cessation of fire.
• Carbon dioxide is stored under very high pressure in fire extinguishers, when it comes out of the extinguisher it is very cold So cools off the heat source
• Therefore, Fire is not sustained for a long time.
• Other types of fire extinguishers used are - foam and water, dry chemical, wet chemical, dry powder, and mist.

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