## 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

Display #
Title
Ericksen Number
Euler Number
Fanning Friction Factor
Fourier Number
Friction Factor
Froude Number
Galileo Number
Graetz Number
Grashof Number
Hagen Number
Hedstrom Number
Jakob Number
Kinetic Friction Coefficient
Knudsen Number
Laplace Number
Lewis Number
Lift Coefficient
Liquid Critical Pressure Ratio Factor Ff
Loss Coefficient
Mach Number
Morton Number
Nusselt Number
Ohnesorge Number
Peclet Number