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The fire triangle is fuel (something that will burn), oxygen and heat. If you take away any of the three the fire will go out. Water reduces the temperature and causes the fire to die out. A note here: Water is used on class "A" fires only. A class "A" fire is anything that will leave an ash when burned such as paper, wood or cloth. If you were to try to use water on a class "B" fire (a liquid fuel fire) the water will cause the liquid to spread out rather than cool it and make the fire worse. A class"C" fire is anything electrical and while water may put the fire out you run the risk of electrocution if you use water. There is also a class "D" type of fire that includes metals such as magnesium that will burn. If you put water on burning magnesium such as an airplane wheel the magnesium may explode.

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13y ago
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13y ago

When you put water on a fire it does two things. It displaces the free oxygen molecules (which have two atoms of oxygen) so that it is not available to participate in the burning process AND it turns to steam, carrying heat away from the fire, cooling it to the point where it can no longer burn.

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12y ago

Water stops the fire because it cools the fire below the temperature it needs to be in order to burn, and because it removes the oxygen from the fire. There are other agents that could be used, but water is very inexpensive, nontoxic and available from the city water mains or out of a lake.

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7y ago

Fire requires fuel, air, and heat to thrive. If you take away any of those three elements, the fire will go out. Water not only removes the heat, but, also, contaminates the fuel.

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Q: Why does spraying water on fire take it out?
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