POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Tungsten crystals. Coloured scanning electron micrograph (SEM) of crystals of tungsten (symbol W, atomic number 74). This grey, hard, metallic element is used extensively in steel alloys, where it imparts great hardness. Tungsten is also used in filament light bulbs and thermionic valves due to its high melting point (3410 degrees Celsius). Magnification: x2275 at 5x7cm size.
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