Question

what is fundamental Unit?

Answer 1

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.

a thing that is or is perceived as being the smallest part into which a complex whole can be analysed.

"the house is the fundamental unit of Basque society"

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Answer 2

A fundamental unit a unit of measurement for a measurable physical property from which every other unit for that quantity can be derived. The fundamental unit for a particular measurable quantity is chosen by convention. They are theunits of the fundamental dimensions of physics.