An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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helium I
  هلیوم I  
heliom I
Fr.: hélium I  

  1. The normal component of → liquid helium (4He) existing between the superfluid transition point (→ lambda point about 2.17 K) at 1 atmosphere of pressure and its boiling point of 4.2 K.

  2. In stellar and interstellar plasma spectroscopy, neutral helium.

See also: → helium.