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Prandtl number

[prahn-tl]
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noun Physics, Thermodynamics.
  1. the ratio of the fluid viscosity to the thermal conductivity of a substance, a low number indicating high convection.
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Origin of Prandtl number

1930–35; named after Ludwig Prandtl (1875–1953), German physicist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018