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caption

Filament in light bulb going from cold to white hot. Bulbs produce light from a 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, due to its strength and high melting point (3410 degrees Celsius). The interior of the bulb contains an inert gas, usually a mixture of nitrogen and argon. Normal air would corrode the tungsten. While in use, the tungsten filament gradually evaporates away until eventually it breaks.

headline Science Source General Science

created date 2010-02-13

credit EAST NEWS

source Science Source

byline Charles D. Winters

original transmission reference 2y4326

weight 1,15MB

size 22cm x 22cm by 300dpi

keywords - Show

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