Fundamental and derived quantities:
Generally, physical quantities are
classified into two types, namely, (i) Fundamental quantities and (ii) Derived
quantities.
Fundamental quantities:
A set of physical quantities which cannot be expressed in terms of any other quantities are known as “Fundamental quantities”. Their corresponding units are called “Fundamental units”.
There are seven fundamental physical
quantities in SI Units (System of International Units).
Derived quantities:
All other physical quantities which
can be obtained by multiplying, dividing or by mathematically combining the
fundamental quantities are known as “derived quantities”.
Their corresponding units are called
“Derived units”. Some of the derived quantities and their units are given in
table 1.1.
Table 1.1 Some of the derived quantities and their units in SI System of units
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