Question

What is fundamental quantity?

Answer 1

a base unit or a fundamental quantity is unit adopted for measurement of a base quantity. a base quantity is one of a conventionally​ chosen subset of physical quantities, where no quantity in the subset can be Expressed in terms of the others

Answer 2

Base unit (measurement) ... A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity. A base quantity is one of a conventionally chosen subset of physical quantities, where no quantity in the subset can be expressed in terms of the others.