UNITS OF PHYSICAL QUANTITIES Or Units of Measurement.

1.2  UNITS OF PHYSICAL QUANTITIES

Or Units of Measurement.

We need unit for every measurement. Because, without unit, the measurement is meaningless. Suppose, anyone tells you that the length of the field is 25, then you should not understand the actual length, but if he says that the length is 25ft. then you should visualize.the actual length. Here the Unit of the Length is ft(Feet).That”s  why we can say that Unit is very important in Measurement of Physical Quantity.

Unit: To measure a Physical Quantity, measure the ratio between whole quantity to standard quantity after taking a particular quantity of the material as a standard. The standard quantity is called the Unit of that particular Quantity.

Fundamental Unit:  Units of Length, Mass, Time they are independent. They Does not depend on each and other one. But they can built another Unit That’s why they are called Fundamental Unit,

Derrived Unit : Those units are built with the help of one or more Fundamental Unit.

Ex.- Area(length²) there have two/more than one length’s unit, similarly

Volume(Length³),Velocity(Length/Time),Acceleration(Length/Time²), Density(Mass/Length³), Force, Weight, Work, Momentum etc.