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, & Science

Display #
Title
Knudsen Number
Laplace Number
Lewis Number
Lift Coefficient
Liquid Critical Pressure Ratio Factor Ff
Loss Coefficient
Mach Number
Nusselt Number
Ohnesorge Number
Peclet Number
Pi
Pipeline Parameter
Piping Geometry Factor
Power Number
Prandtl Number
Pressure Coefficient
Pressure Gradient
Rayleigh Number
Relative Density
Relative Roughness
Resistance Coefficient
Reynolds Number
Rossby Number
Schmidt Number
Shape Factor