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An incandescent light bulb has a coil of tungsten wire (called the filament) suspended in an evacuated (of air) glass bulb. Electricity is passed across the filament which, because of its resistance glows white hot, producing the light. The filament does not melt or burn away because the melting point of tungsten is high and there is not air in the glass bulb for the hot tungsten to react with.

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