An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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reaction rate
  نرخ ِ واژیرش  
nerx-e vâžireš
Fr.: taux de réaction  

The speed with which a → chemical reaction takes place. In other words, the change in → concentration of a → substance divided by the → time interval during which the change is observed.

See also: → reaction; → rate.