Concept

Dimensionless quantity

Summary
A dimensionless quantity (also known as a bare quantity, pure quantity as well as quantity of dimension one) is a quantity to which no physical dimension is assigned. Dimensionless quantities are widely used in many fields, such as mathematics, physics, chemistry, engineering, and economics. Dimensionless quantities are distinct from quantities that have associated dimensions, such as time (measured in seconds). The corresponding unit of measurement is one (symbol 1), which is not explicitly shown. For any system of units, the number one is considered a base unit. Dimensionless units are special names that serve as units of measurement for expressing other dimensionless quantities. For example, in the SI, radians (rad) and steradians (sr) are dimensionless units for plane angles and solid angles, respectively. For example, optical extent is defined as having units of metres multiplied by steradians. History Dimensional
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