helium definition

  • noun:
    • A colorless, odorless inert gaseous element occurring in natural gas in accordance with radioactive ores. It is used as an element of synthetic atmospheres and laser news, as a refrigerant, as a lifting gas for balloons, so when a superfluid in cryogenic study. Atomic number two; atomic fat 4.0026; boiling-point -268.9°C; thickness at 0°C 0.1785 gram per liter. See Dining Table at factor.
    • A colorless and inert gas, and the 2nd lightest chemical factor (symbol He) with an atomic few 2 and atomic weight of 4.002602.
    • A form or sample of element.
    • An inert, monoatomic, gaseous element occurring inside environment associated with sun and performers, as well as in small amounts inside planet's atmosphere, in many nutrients as well as in specific mineral oceans. Its gotten from gas in industrial volumes. Symbol, He; atomic number two; at. wt., 4.0026 (C=12.011). Helium was initially recognized spectroscopically in the sun by Lockyer in 1868; it absolutely was first made by Ramsay in 1895. Helium features a density of 1.98 weighed against hydrogen, and it is more difficult to liquefy compared to the latter. Chemically, its an inert noble gas, of the argon group, and cannot be made to create compounds. The helium nucleus is the charged particle which comprises alpha rays, and helium is for that reason formed as a decomposition item of certain radioactive substances eg radium. The normal helium nucleus has actually two protons and two neutrons, but an isotope with only one neutron can also be seen in atmospheric helium at a good amount of 0.013 %. Liquid helium has actually a boiling point of -268.9° C at atmospheric force, and it is used for keeping very low temperatures, both in laboratory experimentation plus commercial programs to keep up superconductivity in low-temperature superconducting devices. Gaseous helium at regular temperatures is used for buoyancy in blimps, dirigibles, and high-altitude balloons, and in addition for entertainment in celebration balloons.
    • A hypothetical elementary material, understood only because of the outlines ascribed to it into the solar spectrum.
    • a rather light colorless element which one of many six inert gasses; the most difficult fuel to liquefy; takes place in financially extractable quantities in a few all-natural fumes (as the ones that are in Tx and Kansas)

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