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Because petrol is a combustible substance. Water is inert.

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Q: Why does only water cut off oxygen and not petrol when poured on fire?
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Why does the fire run out when put water on it eventhough it is made out of H2O?

When water is poured on fire it prevents the flow of oxygen to it and cools it down. The oxygen and hydrogen do not ignite because they are part of a compound and their properties change.


Why does petrol catch fire but not the water?

There are various ways to extinguish a petrol/gasoline/flammable liquid fire.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. But if you want to sell your Damaged extinguisher then halon.us is the best place for it.


Why does fire not burn in water?

Fire feeds on oxygen, and water does not have much of it.


Why carbon dioxide is better than water for putting out electrical fire and oil?

Beacause fire needs oxygen to stay lit, and water has oxygen in it.


How to Stop a fire without water?

You get rid of the oxygen supply by smothering the fire with a a blanket or something.

Related questions

How would patience be a water to the fire of conflict?

A conflict is like a 'fire'. Water puts out the fire. Petrol makes the fire stronger. Water or petrol poured on the fire(conflict )


Can you set fire to a river?

Petrol will float on the surface of water, as petrol is less dense than water. So, it would be possible to set fire to a river, provided petrol is poured over the surface first!


Why does fire stop if water is poured on it?

Fire needs oxygen to continue burning. Water cuts of the supply of oxygen and hence the fire stops.


Why does fire stop under water?

Fire needs oxygen from the air just like we do. When water gets poured on it, it suffocates and goes out.


Why does the fire run out when put water on it eventhough it is made out of H2O?

When water is poured on fire it prevents the flow of oxygen to it and cools it down. The oxygen and hydrogen do not ignite because they are part of a compound and their properties change.


How does water put out fire?

Fire needs oxygen from the air just like we do. When water gets poured on it, it suffocates and goes out.


Why does petrol catch fire but not the water?

There are various ways to extinguish a petrol/gasoline/flammable liquid fire.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. But if you want to sell your Damaged extinguisher then halon.us is the best place for it.


Can fire catch on water?

Water does not burn because it is already burnt: it is oxidised hydrogen. However, if heated to plasma levels, the hydrogen can be separated from the oxygen and will "burn" when the oxygen is recombined with the hydrogen upon cooling.


Why does water usually put out fire?

Water stops oxygen from getting to the flame, and oxygen is the fire's food.


Why does fire not burn in water?

Fire feeds on oxygen, and water does not have much of it.


Why should sand be poured to put out fire?

Sand is heavy enough to push out all the air from the burning material. If a fire is starved of oxygen - it cannot burn.


Why does a fire go out when you pour cold water on it?

Fire needs Oxygen gas to burn. The water pushes the Oxygen gas away from the fire, preventing it from burning.