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wolfram · W · atomic number 74
Prevedi tungsten na: francuski · nemački
ETYM Swed. tungsten (cf. Dan. tungsteen, German tungstein); tung heavy (akin to Dan. tung, Icel. thungr) + sten stone. Related to Stone.
A heavy gray-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite; SYN. wolfram, W, atomic number 74.
Hard, heavy, gray-white, metallic element, symbol W (from German Wolfram), atomic number 74, atomic weight 183.85. It occurs in the minerals wolframite, scheelite, and hubertite. It has the highest melting point of any metal (6,170şF/3,410şC) and is added to steel to make it harder, stronger, and more elastic; its other uses include high-speed cutting tools, electrical elements, and thermionic couplings. Its salts are used in the paint and tanning industries.
Tungsten was first recognized in 1781 by Swedish chemist Karl Scheele in the ore scheelite. It was isolated in 1783 by Spanish chemists Fausto D'Elhuyar (1755–1833) and his brother Juan José (1754–1796).
White metal, also called wolfram, with highest melting point of all metals, used in filaments of electric lamps, steel alloys, etc.
Veoma tvrd, sjajan metal, teško topljiv; upotrebljava se u izradi legiranih čelika, za izvlačenje vlakana elektrčnih sijalica i u industriji. (lat.)
Hemijski element, tungsten.