Question : Water is not effective in extinguish a fire cause by petrol because
Option 1: The flame is too hot for water to cool it down
Option 2: Water and petrol react chemically
Option 3: Water and petrol are miscible with each other
Option 4: Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Correct Answer: Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Solution : The correct option is Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn.
Because petrol is lighter than water, water is ineffective in extinguishing a fire caused by petrol. When water is put on a petrol fire, the petrol will float to the surface and continue to burn. The water will also vaporise and produce steam, which will help to spread the fire. Furthermore, water may worsen a petrol fire. This is due to the fact that water may cool the fuel, causing it to vaporise faster. The vaporised fuel can then combine with the air to form an explosive combination. The best technique to put out a petrol fire is to use a fire extinguisher made primarily for petrol fires. These fire extinguishers contain foam or powder that smothers the flames and prevents it from spreading.
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