3. Key concepts

3.1 Dimensionality

The notion of dimension (dimension) refers empirically to size. The main dimensions of a simple geometric object are its length, width, depth or thickness, or its diameter.

3.1.1 Dimension in physics

A physical quantity is a physical property that can be quantified by measurement or calculation, and whose various possible values are expressed using a number, usually accompanied by a unit of measurement. The dimension of a physical quantity is expressed in a unit, which is...