English Wikipedia - The Free Encycl... |

Dimensionless quantity

In dimensional analysis, a **dimensionless quantity** is a quantity to which no physical dimension is applicable. It is thus a bare number, and is therefore also known as a **quantity of dimension one**. Dimensionless quantities are widely used in many fields, such as mathematics, physics, engineering, and economics. Numerous well-known quantities, such as , , and , are dimensionless. By contrast, examples of quantities with dimensions are length, time, and speed, which are measured in dimensional units, such as meter, second and meter/second.

See more at Wikipedia.org... |

© This article uses material from