Fundamental and derived units
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each of a set of unrelated units of measurement, which are arbitrarily defined and from which other units are derived. For example, in the SI system the fundamental units are the metre, kilogram, and second and Derived quantities are those that may be expressed in terms of base or derived quan- tities by means of the mathematical symbols of multiplication and division only (no addition or subtraction or any other sign). Their units can be expressed in terms of units of base or derived units.
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