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System of Units

A complete set of units, both fundamental and derived for all kinds of physical quantities is called system of units.
 
SI system it is known as international system of units and is an extended system of units applied to whole physics. There are seven fundamental quantities in this system. These quantities and their units are given in Table.
 
Table Unit and Symbol of Quantities
 
Quantity
Unit
Symbol
Length
Meter
m
Mass
Kilogram
kg
Time
Second
s
Electric current
Ampere
A
Temperature
Kelvin
K
Amount of substance
Mole
mol
Luminous intensity
Candela
cd
 
Besides the seven fundamental units given in Table 1, two supplementary units are also defined: radian (rad) for plane angle and steradian (sr) for solid angle.




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