Usually means: Measure of buoyancy-driven flow stability.
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We found 6 dictionaries that define the word Rayleigh number:

General (2 matching dictionaries)
  1. Rayleigh number: Oxford Learner's Dictionaries
  2. Rayleigh number: Wikipedia, the Free Encyclopedia

Science (3 matching dictionaries)
  1. Rayleigh Number: Eric Weisstein's World of Physics
  2. Rayleigh Number, Rayleigh number: Extragalactic Astronomy

Tech (1 matching dictionary)
  1. Glossary of Meteorology (No longer online)

Definitions from Wikipedia (Rayleigh number)

noun:  In fluid mechanics, the Rayleigh number (after Lord Rayleigh) for a fluid is a dimensionless number associated with buoyancy-driven flow, also known as free (or natural) convection.


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