Question

definition of fundamental unit in physics​

Answer 1

Answer:

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 the units of the fundamental dimensions of physics......

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Answer 2

Fundamental units are units which are independent and not formed by doing mathematical operations on other units.

For example,

metre is a fundamental unit, but unit of density (kg/m^3) is a derived unit composing of two fundamental units.