An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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mean molecular weight
  وزن ِ مولکولی ِ میانگین  
vazn-e molekuli-ye miyângin (#)
Fr.: poids moléculaire moyen  

The total atomic or molecular weight divided by the total number of particles. For instance, the mean molecular weight of a plasma of pure ionized 4He would be 4 (the atomic mass number) divided by 3, the total number of particles (1 nucleus plus 2 electrons), i.e. 4/3.

See also: → mean; → molecular;
→ weight.