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Chapter: 11th Physics : Nature of Physical World and Measurement

SI unit System

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.




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