International system of units
Measuring is
not simply counting. For example, if we need milk or sugar, we must also
understand how much quantity of milk or sugar we are talking about. Thus, there
is a need of some standard quantities for measuring\comparing unknown quantities.
Once a standard is set for a quantity then it can be expressed in terms of that
standard quantity. This standard quantity is called a unit.
With the developments in the field of science
and technology, the need for a commonly acceptable system of unit was seriously
felt all over the world particularly to exchange scientific and technical
information. The eleventh general conference on weight and measures held in Paris
in 1960 adopted a word-wide system of measurements called international
system of unit.
The international system of unit is commonly referred as SI.
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