why is the filament of the bulb kept in vaccume
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An incandescent light bulb contains a thin wire filament (usually tungsten) that glows hot when an electric current is run through it. In the presence of oxygen, thefilament would burn up as a result of the high temperature. A glass bulb, then, is used to keep oxygen away from the filament.
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bcz whn it is kept in air thn the filament burns up due to high temp.after coming in contact of oxygen..
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