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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.
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RenePetrol is a highly flammable liquid because it easily vaporizes and forms a mixture with air that can ignite when exposed to a spark or flame. On the other hand, water does not catch fire because it is a stable compound that does not easily undergo combustion reactions at normal temperatures.
Water cannot extinguish all fires. But the reason is can't extinguish petrol fires is because petrol as a liquid is less dense than water. As water is thrown onto the petrol, the petrol floats on top of the water and continues to vapourise. It is the vapour which burns, slightly above the surface of the petrol.
Petrol is a flammable hydrocarbon, and it can burn in air if ignited. Water is a stable compound of hydrogen and oxygen, and its chemistry is such that it will not burn. Looked at another way, the hydrogen is already oxidized, and it has no reason to react to an ignition source.
Petrol is less dense than water, and it, like other hydrocarbons, will float on water. Further, it can be ignited and will burn as it floats on water. As floating hydrocarbons are exposed to air, if their ignition temperature can be reached, they will burst into flames and burn.
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Why does only water cut off oxygen and not petrol when poured on fire?
Because petrol is a combustible substance. Water is inert.
Why petrol does not catch fire in summer even when its flash point is 44 celsius and temperature of atmosphere is 50 Celsius?
The flash point of petrol represents the temperature at which it can ignite when exposed to an open flame. However, for petrol to combust, it must also be in the presence of oxygen and have an ignition source. In summer, the atmosphere temperature being higher than the flash point of petrol alone is not sufficient to cause it to catch fire without these additional factors.
Can magnesium catch fire in cold water?
No, magnesium cannot catch fire in cold water. It reacts only slowly. And only briefly, too, as a film of magnesium hydroxide forms creating a barrier to further reaction.
Why petrol not used as fuel in stoves?
Petrol is highly flammable and volatile, making it dangerous to use as a fuel in stoves. Its combustion can produce harmful fumes and emissions, posing health risks. Additionally, petrol burns at a higher temperature than is typically needed for cooking, which can lead to food burning or the stove malfunctioning.
What temperature will make things catch on fire?
Most materials will catch fire at temperatures above 300°C (572°F), with some flammable materials igniting at lower temperatures. The exact temperature at which something will catch fire depends on the material and its flammability.
