7. Why co² is used for putting off the fire caused oil or petrol?
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For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO2) is the best extinguisher. CO2, being heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled.
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In case of oil fires, water is not suitable for extinguishing the fire because diseal is less dense than water and will float in water. As water will spread, such the oil will spread and the fire will become more uncontrolable. Thus carbon dioxide helps to extinguish the fire by cutting off oxygen supply.
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