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derived units

In a system of units, derived units are those that are defined by algebraic relations between base units. For example, in SI the unit of force, the newton, is a derived unit, because it is defined as

meters times kilograms over seconds squared

and the meter, the kilogram and the second are base units. The chart below shows how, in SI, the derived units are derived.

Chart shows derivation of SI derived units

Courtesy NIST publication SP 814.