Question

what is fundamental quantity and what is derived quantity ?? explain in deep

Answer 1

The unit of derived quantities depends on one or more fundamental units, which are expressed by the help of dimensions of that derived unit. Simply put, the dimensions of a physical quantity help understand how its unit is relevant to the fundamental units.

Answer 2

Derived quantities are products and/or ratios of the fundamental quantities that exist in a system of units. For example, the seven fundamental quantities of the SI system of units arelength, mass, time, electric current, temperature, amount of substance, and luminous intensity.