Dimensionless Numbers

These numbers have a quantity of one and can not be measured on a scale of physical units.  It is a pure number, thus always having a dimension of 1. The number does not change even if the number system you are working in does.  Dimensionless numbers are used in engineering, mathematics, physics and economics.

Nomenclature & Symbols for Engineering, Mathematics, and Scienceor 

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Stanton Number
Static Friction Coefficient
Strouhal Number
Ursell Number
Weber Number