Lit Light Bulb
by Martyn F. Chillmaid/science Photo Library
Title
Lit Light Bulb
Artist
Martyn F. Chillmaid/science Photo Library
Medium
Photograph - Photograph
Description
Light bulb. Light bulb switched on and glowing. The light comes from the filament, a fine tungsten wire which heats up and glows as an electric current is passed through it. Tungsten is an ideal material for a filament as it is strong and has a high melting point (3410 degrees celsius). The interior of the bulb contains an inert gas, usually a mixture of nitrogen and argon. This is to exclude oxygen which would cause corrosion of the tungsten. Whilst in use, the tungsten filament gradually evaporates away until it breaks.
Uploaded
May 8th, 2022
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