SI UNITS
SI unit stand for " System International d' Unites" in French.
This abbreviation is now adopted by International Standardizing Organization as the abbreviated name of this new system of units in all languages.
The SI system is a comprehensive, logical and coherent system.
DIMENSIONS
A derived unit is recognized by the dimensions and can be defined as the complete algebraic formula for the derive unit.
Dimension equation help:
In conversation from system of units to another one.
In derivation of equations for physical quantities.
In checking the accuracy of an equation.
Some derived unit have given new names
--> For example: force is called Newton (N) instead of kgms^2.