Non-Dimensional Number
Non-Dimensional Number : A pure number not involving any physical dimensions, e.g., a ratio of two velocities or two lengths. Such numbers are fundamental descriptive quantities of a physical system. Non-dimensional numbers involving several variables often are interpreted as estimates of characteristic velocity ratios, force ratios, heat transfer ratios, frequency ratios, etc. Usually several different ratio interpretations are possible and useful for the same number. See: Mach number, Reynolds number, Boussinesq number, Cauchy number, Prandti number, Peclet number, Rayleigh number, Rossby number, strouhal number, Richardson number, Nusselt number, Grashof number, Taylor number). See Also: dimensional analysis, inspectional analysis
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