UNITS OF PHYSICAL QUANTITIES

UNITS - units are used to measure a physical quantites for example- 5 kg. sugar here kg (kilogram ) is the unit of mass there are three systems of unit measurement as -                                                                1. MKS system 2. CGS system 3. FPS  system                                                                                                                                                           all these systems are defined as

but in the present day a another system of unit is used this is called international system of units          (SI system)  SI system is defined as