| 单词 | 惰性气体 |
| 释义 | 〔krypton〕A whitish, inert gaseous element used chiefly in gas discharge lamps and fluorescent lamps. Atomic number 36; atomic weight 83.80; melting point -156.6°C; boiling point -152.30°C; density 3.73 grams per liter (0°C). See table at element 氪：一种微白的惰性气体元素，主要用于充气灯和荧光灯。原子序数36；原子量83.80；熔点-156.6°C；沸点-152.30°C；0°C时密度每升3.73克 参见 element〔Ramsay〕British chemist. He won a 1904 Nobel Prize for discovering the inert gases argon, helium, neon, xenon, and krypton.拉姆齐，威廉：(1852-1916) 英国化学家。1904年因发现惰性气体氩、氦、氖、氙、氪而获诺贝尔奖〔helium〕A colorless, odorless inert gaseous element occurring in natural gas and with radioactive ores. It is used as a component of artificial atmospheres and laser media, as a refrigerant, as a lifting gas for balloons, and as a superfluid in cryogenic research. Atomic number 2; atomic weight 4.0026; boiling point -268.9°C; density at 0°C 0.1785 gram per liter. See table at element 氦：自然界天然气体或放射性矿石中一种无色、无味的惰性气体状成分。用作人造大气层和镭射媒体的组成部分，和用作制冷剂及飞行气球的气体，还在低温学研究中用作超流体。原子序数2；原子量4.0026；沸点-268.9°C；浓度在0°C时为每升0.1785克 参见 element〔radon〕A colorless, radioactive, inert gaseous element formed by the radioactive decay of radium. It is used as a radiation source in radiotherapy and to produce neutrons for research. Its most stable isotope is Rn 222 with a half-life of 3.82 days. Atomic number 86; melting point -71°C; boiling point -61.8°C; specific gravity (solid) 4. See table at element 氡：一种无色、有放射性的惰性气体元素，由镭蜕变产生。在放射疗法中可用作辐射源，在科研中可用于制造中子。它最稳定的同位素是Rn222。半衰期为3.82天。原子序数86；熔点-71°C；沸点-61.8°C；比重（固态）4 参见 element〔neon〕Symbol Ne A rare, inert gaseous element occurring in the atmosphere to the extent of 18 parts per million and obtained by fractional distillation of liquid air. It is colorless but glows reddish orange in an electric discharge and is used in display and television tubes. Atomic number 10; atomic weight 20.183; melting point -248.67°C; boiling point -245.95°C. See table at element 符号 Ne 氖：稀有的惰性气体元素，在空气中以百万分之十八的比例存在，液态空气经分馏后得到。常无色，通电流时发红橙光。用于屏幕和电视显像管。原子序数10；原子量20.183；熔点-248.67°C；沸点-245.95°C 参见 element〔argon〕A colorless, odorless, inert gaseous element constituting approximately one percent of Earth's atmosphere, from which it is commercially obtained by fractionation for use in electric light bulbs, fluorescent tubes, and radio vacuum tubes and as an inert gas shield in arc welding. Atomic number 18; atomic weight 39.94; melting point -189.2°C; boiling point -185.7°C. See table at element 氩：无色无味惰性气体元素，构成地球大气约百分之一的部分，它可通过分馏法大量获取，使用于电灯泡，荧光灯及收音机真空管中，并可在电弧焊接中作惰性气体屏蔽物。原子序数18；原子量39.94；熔点-189.2°C；沸点-185.7°C 参见 element〔propellant〕A compressed inert gas, such as a fluorocarbon, that acts as a vehicle for discharging the contents of an aerosol container.压缩气体：被压缩的惰性气体，比如碳氟化合物，这种气体充当喷撒器中物质的载体 |
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