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In an incandescent light bulb, a positive and negative (or neutral wire) are connected by a tungsten filament in a vacuum. An electrical current passes through the thin filament, heating it very hot and causing it to glow. Eventually, after repeated use, the tungsten filament gets quite thin and eventually breaks, which is what happens when the light bulb burns out! Also, if the filament is exposed to oxygen while the current is flowing, the filament will break melts.

TIP: DON'T USE INCANDESCENT LIGHT BULBS... SWITCH TO ENERGY-SAVING COMPACT FLUORESCENTS!!!!

Actually most incandescent light bulbs have argon and nitrogen inside them. Early lightbulbs were vacuums.

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12y ago

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