How is wire size typically expressed?

Wire size is typically expressed using gauge, which is a standardized measurement system that indicates the thickness of the wire. The gauge number is inversely related to the diameter of the wire; as the gauge number increases, the actual diameter of the wire decreases. This system allows for a consistent reference for wire sizes in electrical applications, making it easier for professionals to select appropriate wires for various purposes, such as ensuring adequate electrical conductivity and mechanical strength.

While terms like diameter, length, and thickness may describe certain physical properties of wire, they do not convey the standardized sizing needed for electrical wiring. Diameter refers specifically to the measurement across the wire, while thickness could be a less precise term and does not denote a specific standard. Length merely indicates how long the wire is, which does not pertain to its size or capacity in terms of electrical or mechanical properties. Thus, gauge remains the industry standard for expressing wire size.