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Meaning of Prandtl number

Prand'tl num"ber

Pronunciation: (prän'tl), [key]
— Physics, Thermodynam.
  1. the ratio of the fluid viscosity to the thermal conductivity of a substance, a low number indicating high convection.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.