## Dimensionless Numbers Dimensionless numbers, abbreviated as DN, are nondimensional quantity of dimension one and can not be measured on a scale of physical units.  All quantities of dimension one are said to have the SI coherent derived unit "one" with the symbol "1".  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 or quantities are used in many disiplines such as chemistry, economics, engineering, mathematics, and physics.

## Nomenclature & Symbols for Engineering, Mathematics, and Science

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Title
Abbe Number
Aeration Number
Archimedes Number
Arrhenius Number
Atomic Number
Atwood Number
Bagnold Number
Bejan Number - Fluid Mechanics
Bejan Number - Heat Transfer
Bejan Number - Mass Transfer
Bingham Number
Biot Number
Bodenstein Number
Bond Number
Capillary Number
Cauchy Number
Cavitation Number
Courant Number
Darcy Friction Factor
Darcy-Weisbach Equation
Dean Number
Deborah Number
Drag Coefficient
Eckert Number
Elasticity Number