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Why is water not suitable for putting out a petrol fire ?
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- The oxygen content of water is isolated by petrol and thus it helps in burning
- Petrol is too inflammable to be extinguished by water
- The heat required for combustion of petrol is very low
- Water, being heavy, slips below petrol which thus remains in contact with air and burns
- The oxygen content of water is isolated by petrol and thus it helps in burning
Correct Option: D
Water is not effective on petrol fire because it has higher density than petrol as a result of which it sinks to the bottom, while petrol stays afloat and keeps burning. Petro-chemical fires are nearly always extinguished with chemical foam.
