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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What are the two main required characteristics of a unit?
Characteristics of unit are:
1. Invariability 2. Avaialbility
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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.