Why can a pace or a footstep not be used as a standard unit of length?
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Standard unit of length is a fixed length all over the world, which does not vary with time, place and persons and is not affected by any natural phenomenon. A pace or a footstep cannot be used as a standard unit of length as it is not fixed in length and varies from person to person.
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Because a pace or a footstep of each and every person is not equal.
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