Question

why should nor use water in case of fire due to petrol​

Answer 1

Answer:

Water being heavier than petrol slips down permitting the petrol to rise to the surface and continue to burn. Also, the existing temperature is so high that most of the water poured on the fire evaporates even before it can extinguish the fire.

Answer 2

Answer:

water being heavier than petrol slips down permitting the petrol to rise to the surface and continue to burning