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单词 tungstenic
释义

tungstenic


tung·sten

T0411900 (tŭng′stən)n. Symbol W A hard, brittle, corrosion-resistant, gray to white metallic element extracted from wolframite, scheelite, and other minerals, having the highest melting point and lowest vapor pressure of any metal. Tungsten and its alloys are used in high-temperature structural materials and wear-resistant tools and machine parts; in electrical elements, notably lamp filaments; and in instruments requiring thermally compatible glass-to-metal seals. Atomic number 74; atomic weight 183.84; melting point 3,422°C; boiling point 5,555°C; specific gravity 19.3 (20°C); valence 2, 3, 4, 5, 6. Also called wolfram. See Periodic Table.
[Swedish : tung, heavy (from Old Norse thungr) + sten, stone (from Old Norse steinn; see stāi- in Indo-European roots).]
tung·sten′ic (-stĕn′ĭk) adj.

Tungabhadra

Tungabhadra

 

a river in South India, a right tributary of the Krishna River. The Tungabhadra is formed by the confluence of the Tunga and Bhadra rivers, which rise in the Western Ghats. Measured from the source of the Bhadra, the river is 710 km long, and it drains an area of 72,200 sq km. The greater part of the Tungabhadra’s course lies in the southern part of the Deccan plateau. The river is fed mainly by rain, and it has a monsoonal regimen with summer high water. The mean flow rate of the Tungabhadra is approximately 650 cu m per sec. Near the city of Hos-pet on the river are a dam more than 2,400 m long and 49 m high, a reservoir approximately 380 sq km in area, a system of canals that irrigates more than 200,000 hectares of land, and a hydroelectric power plant. There is also a large reservoir on the Bhadra River. The city of Kurnool is situated on the Tungabhadra.

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更新时间:2024/12/24 1:05:51