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| he·li·um [ hlee əm ] |
noun |
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| Definition: |
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inert gas: a nonflammable inert gaseous element that is colorless and odorless. Source: natural gas. Use: inert atmospheres, cryogenic research, lasers, inflating balloons.
Symbol He
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| [Late 19th century. < Greek hēlios "sun"; because its existence was deduced from its emission line in the solar spectrum] |
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