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Lit light bulb

Lit light bulb

T194/0414

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Credit

MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY

Caption

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.

Release details

Model release not required. Property release not required.

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