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If you've always wondered how light bulbs were made, then check out this interesting "How it's Made" segment. Video after the jump.
An electrical current passes through a thin filament, heating it and causing it to become excited, releasing thermally equilibrated photons in the process. The enclosing glass bulb prevents the oxygen in air from reaching the hot filament, which otherwise would be destroyed rapidly by oxidation

This entry was posted on 02/13/2007 02:40am and is filed under Science, Video .
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