WHY PETROL FIRE CANNOT BE PUT OUT WITH WATER ?

Many times we hear that if there is a petrol fire people do not use water to put it out. Did you know what is the reason behind it. Why people do not use water to put out petrol fire. In every kind of fire we use fire but why not in petrol fire. 


   
ANSWER :-

Petrol is a hydro carbon which remains isolated with water and is having less density. So when water is poured petrol floats on it and keeps on burning. The temperature of the burning petrol is so high that the water poured on the petrol fire is evaporated before it extinguishes the fire.

The first thing that you need to consider when putting out a fire is the kind of fire your dealing with. Petrol fire can’t be put out with water because its lighter which may lead to further spread. It’s advisable that you use foam fire extinguishers which works by forming a film on the liquid and extinguishing it.
For putting out the petrol fire we have to cut the supply of air so that combustion reaction do not take place this can be done by sand.