Question

Whatis the necessity of selecting some units as fundamental units ​

Answer 1

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➡️The number of physical units required to be measured is very large, If a separate unit is defined for each of them, then it will become very difficult to remember all of them as they as they will be quite unrelated to each other .

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Answer 2

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To maintain uniformity in the measurement certain sets of fundamental units are selected. These units are followed world wide.

Fundamental units are the physical units that cannot be derived from any other units.

Example: Length, Mass, Time etc. You cannot derive them from other quantities.