SIderived

SIderived refers to the class of units in the International System of Units (SI) that are defined by algebraic combinations of the base units rather than being base units themselves. The SI base units are metre, kilogram, second, ampere, kelvin, mole, and candela; all other SI units derive from these through multiplication, division, and exponentiation of their base quantities.

Derived units have distinct names and symbols, and they quantify a wide range of physical quantities such as force, energy, pressure, electric charge, electric potential, and luminous flux. Examples include the newton (N) for force, defined as kg·m·s^-2; the joule (J) for energy, kg·m^2·s^-2; the watt (W) for power, kg·m^2·s^-3; the pascal (Pa) for pressure, kg·m^-1·s^-2; the coulomb (C) for electric charge, A·s; the volt (V) for electric potential, J/C; the farad (F) for capacitance, C/V; the ohm (Ω) for resistance, V/A; and the weber (Wb) for magnetic flux, V·s. Photometric units such as lumen (lm) and lux (lx), and radiological/dosimetric units such as becquerel (Bq), gray (Gy), and sievert (Sv) are also SI-derived. Some units like the radian and steradian are dimensionless but are treated as derived units in practice.

Derived units are standardized by the General Conference on Weights and Measures and maintained by the International Bureau of Weights and Measures, ensuring consistency across science, industry, and commerce.