## 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
Pi
Pipeline Parameter
Piping Geometry Factor
Power Number
Prandtl Number
Pressure Coefficient
Rayleigh Number
Relative Density
Relative Roughness
Resistance Coefficient
Reynolds Number
Richardson Number
Roshko Number
Rossby Number
Rouse Number
Schmidt Number
Shape Factor
Sherwood Number
Skin Friction Coefficient
Sommerfield Number
Specific Gravity
Stanton Number
Static Friction Coefficient
Strouhal Number