tungsten
钨,钨钢,钨丝,钨合金
Definitions
- 1
Chemistry.
- : a rare, metallic element having a bright-gray color, a metallic luster, and a high melting point, 3410° C, and found in wolframite, tungstite, and other minerals: used in alloys of high-speed cutting tools, electric-lamp filaments, etc. Symbol: W; atomic weight: 183.85; atomic number: 74; specific gravity: 19.3.
Examples
Tusch and Münker developed a powerful new method for extracting tiny traces of tungsten from ancient rocks.
The raw materials— tin, tantalum, tungsten and gold—were dubbed “conflict minerals.”
The Mojave is rich with silver, tungsten, gold, and iron deposits.
In China, for example, tungsten, tantalum, tin and gold are mined and ore is imported from other countries.
Tungsten, tantalum, tin and gold are used to produce many common consumer electronics devices.
And when you review the periodic table, take special note of Tungsten, or Wolfram.
This property may be increased by alloying the steel with tungsten and hardening it before it is magnetized.
Magneto field magnets are always made of tungsten steel alloy, so treated that it will retain its magnetism for lengthy periods.
The operation of mounting Tungsten filaments in small copper wire is very much like threading an exceedingly small needle.
More efficient lamps have been devised with filaments of the metals tantalum and tungsten (Fig. 274).
How many candle power should a 20-watt tungsten lamp give if its efficiency is one watt per candle power?