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Which gas is used in the fire extinguisher?
Carbon dioxide
Nitrogen
Oxygen
Hydrogen
Carbon dioxide
Carbon dioxide (CO2тАЛ) is used in fire extinguishers because it is non-flammable and heavier than air. It forms a blanket over the fire, displacing oxygen and suffocating the flames.
Carbon dioxide (CO2тАЛ) is used in fire extinguishers because it is non-flammable and heavier than air. It forms a blanket over the fire, displacing oxygen and suffocating the flames.
Throwing a heavy, dense blanket over a small flame to smother it and block out the air.
CO2 = Chokes Oxygen
CO2тАЛ тАФ Chemical formula for carbon dioxide
Carbon dioxide is stored under pressure as a liquid inside the cylinder. Upon actuation, it rapidly expands and cools into a gas and dry ice particles, displacing the surrounding oxygen and cooling the fire source.
Carbon dioxide is about 1.5 times denser than air.
It does not conduct electricity, making it safe for electrical fires.
It leaves no residue after evaporation.
Safe for electrical fires (Class C)
Leaves no chemical residue
Risk of asphyxiation in poorly ventilated spaces
Ineffective on Class A (solid combustibles) deep-seated fires
Electrical switchboards and server rooms
Flammable liquid fires (petrol, oil, paints)
Oxygen (Option C) actively supports combustion and would feed the fire.
Hydrogen (Option D) is highly flammable and explosive.
A is correct тАФ Carbon dioxide is non-flammable, denser than air, and smothers fires by cutting off the oxygen supply.
For competitive exams, note that CO2 extinguishers are color-coded (black band in India/UK) and are ideal for Class B and C fires.
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