An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Dirac constant
  پایای ِ دیراک  
pâyâ-ye Dirac
Fr.: constante de Dirac  

The → Planck constant divided by 2π and denoted ħ, pronounced h-bar. Also called → reduced Planck constant.

See also: → Dirac; → constant.