physical quantity

A physical quantity is either a physical property that can be measured (e.g. mass, volume, etc.), or the result of a measurement. The value of a physical quantity Q is expressed as the product of a numerical value {Q} and a physical unit [Q]. Q = {Q} x [Q] (SI units are usually preferred today). The notion of physical dimension of a physical quantity was introduced by Fourier (1822).
See more at Wikipedia.org...