define fundamental unit and derived unit
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fundamental units: 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.
derived unit:SI derived units are units of measurement derived from the seven base units specified by the International System of Units. They are either dimensionless or can be expressed as a product of one or more of the base units, possibly scaled by an appropriate power of exponentiation.
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Fundamental units- Units which cannot be subdivided into its constituent / cannot be divided any further.
Derived units- Units which are formed by the combination of two or more fundamental units.
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