An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Number of Results: 2 Search : helium I
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.

→ helium.

helium II
  هلیوم II   
heliom II

Fr.: hélium II   

1) A → superfluid, colder component of → liquid helium (4He), occurring when → helium I is cooled below the → lambda point.
2) 2) In stellar and interstellar plasma spectroscopy, ionized helium.

→ helium.