INTERNATIONAL SYSTEM OF UNITS

There are three kinds of system International units (SI);

i)Base Units  

ii) Supplementary units 

iii) Derived units

           i) Base Units;

• ·         They are independently exist.
• ·         These units  are not derived from other quantities.
• ·         There are seven Base Units;

Physical Quantity	SI Unit	Symbol
Length	meter	m
Mass	kilogram	kg
Time	second	s
Electric current	ampere	A
Thermodynamic Temp.	kelvin	K
Intensity of light	candela	Cd
Amount of substance	mole	mol

ii) Supplementary  Units;

·         Also known as Geometrical quantities

·         Used for Angular measurements

·         They are of two kinds

i)Plane angle 

ii)Solid angle