Posted by Bulborama on Tuesday, October 11, 2011,
The incandescent light bulb, incandescent lamp or incandescent light
globe makes light by heating a metal filament wire to a high temperature
until it glows. The hot filament is protected from air by a glass bulb
that is filled with inert gas or evacuated. In a halogen lamp, a
chemical process returns metal to the filament, extending its life.
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