STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Light bulb filament. Coloured scanning electron micrograph (SEM) of a tungsten light bulb filament (blue) and the wire used to support it (yellow). The heat generated by an electrical current flowing through the filament makes it glow white hot. Magnification: x80 when printed at 10 centimetres wide.
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