Water extinguishes a fire in two ways: (1) It brings the temperature of the combustible material below its ignition temperature. (2) The water vapour formed due to the heat of fire cuts the supply of oxygen.
Carbon dioxide is highly volatile. So, it immediately vaporises to cut off the supply of air. In the absence of supporter of combustion, fire is extinguished.
A
Water extinguishes a fire in two ways: (1) It brings the temperature of the combustible material below its ignition temperature. (2) The water vapour formed due to the heat of fire cuts the supply of oxygen.
B
Carbon dioxide is highly volatile. So, it immediately vaporises to cut off the supply of air. In the absence of supporter of combustion, fire is extinguished.
C
Both A and B
D
None of the above
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Solution
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Water helps to extinguish a fire by cooling the substance that is undergoing combustion and bringing its temperature below its ignition temperature. The water vapor formed due to the heat of fire surrounds the substance that undergoes combustion and cuts the supply of oxygen.
Carbon dioxide is heavier than oxygen. So, it covers the fire like a blanket and cuts off the oxygen supply, thus putting off the fire.
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