What is the need of measurement?

To get the complete knowledge of any physical quantity, measurement is needed. Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Knowledge without measurement is incomplete and unsatisfactory. 
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What are the two main required characteristics of a unit?

Characteristics of unit are:

1. Invariability
2. Avaialbility


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Define physical quantity.

 


A measurable quantity in terms of which laws of Physics can be expressed is called physical quantity.

The result of a measurement of a physical quantity is expressed by a number accompanied by a unit.


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Give four examples of physical quantities.


Examples of Physical quantitie are force, mass, density and power.
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Define unit.

The quantity used as a standard of measurement is called unit. 

Example: Unit of time is second. 

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