from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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; 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 3,410°C; boiling point 5,900°C; specific gravity 19.3 (20°C); valence 2, 3, 4, 5, 6. Also called wolfram. See Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a metallic chemical element (symbol W) with an atomic number of 74. The symbol is derived from the Latin word wolframium.
from the GNU version of the Collaborative International Dictionary of English
- n. A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible. It has both acid and basic properties. When alloyed in small quantities with steel, it greatly increases its hardness. Symbol W (Wolframium). Atomic weight, 183.6. Specific gravity, 18.
- n. Scheelite, or calcium tungstate.
from The Century Dictionary and Cyclopedia
- n. Metallic tungsten has been obtained by means of the electric furnace in a fused state, though not quite compact, and probably not quite pure. It is of rather bright gray color, with metallic luster, specific gravity 18.7, hard, but not sufficiently so to scratch glass, of very high melting-point and softening gradually before fusion, so that it may be welded. It is little acted on by air or water at ordinary temperature, slowly attacked by hydrochloric, hydrofluoric, or sulphuric acid, rapidly by hydrochloric or hydrofluoric acid with addition of nitric acid, and when in powder burns in the air at a red heat.
- n. Chemical symbol, W; atomic weight, 183.5. A metal some of whose ores have long been known (see wolfram and scheelite), but they were supposed to be compounds of tin.
- n. The native tungstate of lime.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite
But at the tip, where the electric field created by applying a voltage to the tungsten is at its maximum, N2 molecules are driven away.
These elements - tungsten is one example - are found all over the world and in relative abundance.
Perfect! pure tungsten is a steel-gray to tin-white metal.
To start with the tungsten is chemically very reactive and the nitrogen roughens the tungsten surface.
Canadian production of copper, zinc, lead, nickel and tungsten is being expanded as rapidly as possible.
Yes - For two key reasons Potential near-term tungsten primary producers face economic uncertainty and a credit crisis (difficulty in raising project financing) = Limited
The closest they get to matching the tungsten is that dark amber color, which doesn’t look nearly the same.
Tungsten is mixed with carbon to make a very strong, very resistant material called tungsten carbide.
Are metal alloys such as tungsten alloys not patentable?
The country's main exports were primary commodities such as tungsten, fish, and human hair for wigs.