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Why do we have different units for same ...

Why do we have different units for same physical quantity?

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The value of any given physical quantity may vary over a wide range, therefore, different units of same physical quantity are required.
e.g.,The length of a pen can be easily measured in cm, the height of a tree can be measured in metres, the distance between two cities can be measured in kilometres and distance between two heavenly bodies can be measured in light year.
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