Measurement – Units and Dimensions

Physics :

Physics is the study of the laws of nature from the observed events.

The quantities by means of which we describe the laws of physics are called physical quantities. There are two type of physical    quantities.

        Fundamental  quantities

        Derived  quantities
1.1  Fundamentalquantities:
Physical quantities which are independent of each other and cannot be further resolved into any other physical quantityare known as fundamental quantities.  There  are  seven   fundamental quantities.


Derived  Quantities :

Physical quantities which depend upon fundamental quantities or which can be derived from fundamental quantities are known as derived quantities.

  2. UNITS           

Definition : Things in which quantity is measured are  known  as units.
Measurement  of  physical quantity
= (Magnitude) ×  (Unit)

There are three types of   units

        Fundamental  or  base units

        Derived units
        Supplementary  units
Fundamental  or  base units:
Units of fundamental quantities are called fundamental units.

 Characteristics  of  fundamental units:

(i)  they are well defined and are of a suitable size
(ii)  they are easily reproducible at all    places
(iii)   they do not vary with temperature, time pressure  etc.  i.e. invariable.
(iv)  there are seven fundamental  units.


***Recommended video Units and Dimensions for BSNL TTA :







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