Helium meaning

hēlē-əm
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.
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A colorless, odorless chemical element, one of the noble gases, having the lowest known boiling and melting points: it is used in low-temperature work, as a diluent for oxygen, in deep-sea breathing systems, for inflating balloons, etc.: symbol, He; at. no. 2
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A very lightweight, colorless, odorless element in the noble gas group. Helium occurs in natural gas, in radioactive ores, and in small amounts in the atmosphere. It has the lowest boiling point of any substance and is the second most abundant element in the universe. Helium is used to provide lift for balloons and blimps and to create artificial air that will not react chemically. Atomic number 2; atomic weight 4.0026; boiling point −268.9°C; density at 0°C 0.1785 gram per liter.
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(uncountable) A colorless and inert gas, and the second lightest chemical element (symbol He) with an atomic number of 2 and atomic weight of 4.002602.
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(countable) A form or sample of the element.
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Origin of helium

  • From Greek hēlios sun (so called because its existence was deduced from the solar spectrum) sāwel- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From New Latin helium, from Ancient Greek ἥλιος (hēlios, “sun”) (because its presence was first theorised in the sun's atmosphere).

    From Wiktionary