| 释义 |
he·li·um AHD[hēʹlē-əm] D.J.[ˈhiːliːəm]K.K.[ˈhiliəm]n.Symbol He （名词）符号 He - 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
- From Greek hēlios [sun (so called because its existence was deduced from the solar spectrum)] * see sāwel- 源自 希腊语 hēlios [太阳（该元素的存在首先是在太阳光谱中测得，故名）] * 参见 sāwel-
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