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SI Units
SI unit is the
abbreviation for System International de
units and is the modern form of metric system finally agreed
upon at the eleventh International conference of weights
and measures, 1960. This system of units is now being adopted
throughout the world and will remain the primary system of units of measurement. SI system possesses
features that make it logically superior
to any other system.
There are seven
fundamental units (base units) and two supplementary units.
fundamental units (base units) and two supplementary units.
SI system of units
Physical quantity |
Unit |
Symbol |
Fundamental quantities |
ย |
ย |
1.Length |
metre |
m |
2.Mass |
kilogram |
kg |
3.Time |
second |
s |
4.Electric current |
ampere |
A |
5.Temperature |
kelvin |
K |
6.Luminous Intensity |
candela |
cd |
7.Amount of substance |
mole |
mol |
Supplementary quantities |
ย |
ย |
1. Plane angle |
radian |
rad |
2. Solid angle |
steradian |
sr |