The system of units used by scientists and engineers around the world is commonly called the metric system .

**SI unit
System**

The
system of units used by scientists and engineers around the world is commonly
called ** the metric system** but, since 1960, it has been known officially
as the International System, or SI (the abbreviation for its French name,
Systeme International). The SI with a standard scheme of symbols, units and
abbreviations, were developed and recommended by the General Conference on Weights
and Measures in 1971 for international usage in scientific, technical,
industrial and commercial work. The advantages of the SI system are,

i.
This
system makes use of only one unit for one physical quantity, which means a
rational system of units

ii.
In
this system, all the derived units can be easily obtained from basic and
supplementary units, which means it is a coherent system of units.

iii.
It
is a metric system which means that multiples and submultiples can be expressed
as powers of 10.

In
SI, there are seven fundamental units as given in Table 1.2

Triple point of water is the temperature at which saturated
vapour, pure and melting ice are all in equilibrium. The triple point
temperature of water is 273.16K

Table
1.3 lists some of the derived quantities and their units.

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

11th Physics : UNIT 1 : Nature of Physical World and Measurement : SI unit System |

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