英语词汇“helium”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-新都网

he·li·um

(hēlē-əm)

n. Symbol 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 Periodic Table.

[From Greek hēlios, sun (so called because its existence was deduced from the solar spectrum); see sāwel- in the Appendix of Indo-European roots.]

单词	helium
释义	he·li·um (hēlē-əm) n. Symbol 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 Periodic Table. [From Greek hēlios, sun (so called because its existence was deduced from the solar spectrum); see sāwel- in the Appendix of Indo-European roots.]
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