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What are fundamental units and derived u...

What are fundamental units and derived units?

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Very few physical quantities (independent of each other) are used to express all the other physical quantities. These are known as fundamental or base qunatities. The units for the funamental quantities are known as fundamental units. For example: Mass, length and time with kg , m and s as their units.
THe units of all the other physical quantities (derived quantities) can be expressed in terms of fundamental quantities. these units are known as derived units. For example : Velocity is a derived quantity with unit m/s.
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