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Unformatted text preview: wire inside the bulb. The tungsten wire is sealed inside a glass bulb since if you did this in air the light bulb would burn out very quickly. This is because the tungsten wire undergoes a chemical reaction with the O 2 gas in the air to form tungsten oxide. 2W + 3O 2 2WO 3 To prevent this reaction from happening, all oxygen is removed from the air sealed inside the bulb. If oxygen leaks into the bulb, then the tungsten wire reacts to become tungsten oxide and the oxidized wire will no longer pass electrical current readily. If you try to pass electrical current through the oxidized wire it will quickly heat up and break. That is, the lightbulb burns out ....
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