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| | | Tungsten | ทังสเตน [TU Subject Heading] | | tungsten | ทังสเตน, ธาตุแทรนซิชัน เลขอะตอม 74 สัญลักษณ์ W จุดหลอมเหลว 3, 370°C จุดเดือด 5, 930°C ใช้ทำไส้หลอดไฟฟ้าและโลหะผสมอื่น ๆ ในธรรมชาติมีปนอยู่ในแร่วุลแฟรไมต์ (wolframite FeWO4 ) และซีไลต์ (scheelite CaWO4) [พจนานุกรมศัพท์ สสวท.] |
| | | ทังสเตน | (n) tungsten, Syn. วุลแฟรม, Example: เราใช้ทังสเตนในการทำไส้หลอดไฟฟ้า, Thai Definition: ธาตุลำดับที่ 74 เป็นโลหะสีเทา ลักษณะเป็นของแข็ง ใช้ประโยชน์เป็นไส้หลอดไฟฟ้า ผสมกับโลหะอื่นให้เป็นโลหะเจือ, Notes: (อังกฤษ) |
| | ทังสเตน | [thangsatēn] (n) EN: tungsten FR: tungstène [ m ] |
| | | | | Tungsten | n. [ Sw. tungsten (cf. Dan. tungsteen, G. tungstein); tung heavy (akin to Dan. tung, Icel. þungr) + sten stone. See Stone. ] 1. (Chem.) 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. [ 1913 Webster ] 2. (Min.) Scheelite, or calcium tungstate. [ Obs. ] [ 1913 Webster ]
Tungsten ocher, or
Tungstic ocher (Min.), tungstite. [ 1913 Webster ]
| | Tungstenic | a. Of or pertaining to tungsten; containing tungsten; as, tungstenic ores. [ R. ] [ 1913 Webster ] | | Tungsten lamp | . An electric glow lamp having filaments of metallic tungsten, and contained in a glass bulb which is evacuated or has an inert gas, to avoid oxidation of the tungsten; a common form of light bulb. Such lamps, owing to the refractory nature of the metal, may be maintained at a very high temperature and require an expenditure of only about 1.25 watts per candle power, depending on the total wattage and the design of the bulb. By mid-20th century tungsten lamps became the most common type of incandescent (as contrasted with fluorescent) lamp; thus the phrase
incandescent lamp or
incandescent light typically refers to a tungsten lamp. [ Webster 1913 Suppl. +PJC ] | | Tungsten steel | . (Metal.) A steel containing a small amount of tungsten, noted for tenacity and hardness, even under a considerable degree of heat. Magnets made of it are said to be highly permanent. It often contains manganese. [ Webster 1913 Suppl. ] |
| | 钨 | [wū, ㄨ, 钨 / 鎢] tungsten W (wolfram), transition metal, atomic number 74 #19,712 [Add to Longdo] |
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