An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Prandtl number
  عدد ِ پرانتل  
adad-e Prandtl
Fr.: nombre de Prandtl  

A dimensionless number representing the ratio of the fluid viscosity to the thermal conductivity of a substance; a low number indicates high convection.

See also: Named after the German physicist Ludwig Prandtl (1875-1953); → number.