why should water not be used to put off fire caused by burning of petrol?
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- Water is heavier than petrol and will just have the effect of spreading the fire, Petro-chem fires are nearly always extinguished with chemical foam which forms a blanket over the flames and cuts off the oxygen supply. The worst thing you can turn on a petrol fire is a hosepipe. macy · 8 years ago 1 Thumbs up 0 Thumbs down Comment Report Abuse
The three main method to extinguish fire is
1. To cut supply of air
2.To cut supply of Burning fuel
3.To cool the burning material
Water is not effective on petrol fire becoz water have high density than petrol so when we put water the petrol being lighter floats on water hence all the methods fail becoz water donot cut the supply of air neither fuel nor decreases temp hence it fails so SAND is used as it cut supply of air Gaurav · 8 years ago 1 Thumbs up 0 Thumbs down Comment Report Abuse
B'coz water is denser than petrol hence it goes to the bottom & petrol will float on water. Due to this petrol burns easily in the open/air.
pkn KhushiRaj · 8 years ago 0 Thumbs up 0 Thumbs down Comment Report Abuse
- WATER IS MADE FROM THE COMBINATION OF H+1/2O2.PETROL IS MADE FROM THE ALTERNATIVE COMBINATION WHICH IS NOT USED BY WATER IN EXTINGUISH .SO IT IS NOT EFFECTIVE IN EXTINGUISH A FIRE CAUSED BY PETROL. VIJAY V · 8 years ago 0 Thumbs up 0 Thumbs down Comment Report Abuse
- This is because water is heavier than petrol. So when we put water on petrol fire, it exsanguinates to the bottom, while the petrol on top continues to burn. sajjumol · 8 years ago 0 Thumbs up 1 Thumbs down Comment Report Abuse
wen petrol burns it itself produces water according to chemistry hydrocarbon + oxygen gives carbon dioxide andf water.
Thus if in the presence of water itr still burns this might infer that H2O is ineffective. Source(s):None badjadi m · 8 years ago 0 Thumbs up 2 Thumbs down Comment Report Abuse
it is not because water is heavier than oil. it is because water is denser, meaning, water has more mass in per unit volume. this is what causes buoyancy.
so oil, on top of water, has a lot of contact with O2 to burn out in an exothermic reaction. falan filan · 8 years ago 0 Thumbs up 1 Thumbs down Comment Report Abuse
- Because it does not "smother the oxygen" to put out the fire. private · 8 years ago 0 Thumbs up 1 Thumbs down Comment Report Abuse
Water isn't used to exinguished fire,because in water oxygen is present, 2) And oxygen gas helps to burn. 3) hence,carbon dioxide gas is used to extinguished fire. 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.