Explain why hand span cannot be used as a standard unit of length.
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Footstep and handspan both vary from people to people.
If it is used as SI unit there would be a state of uncertainty because if something is large for someone then it would be small for the other.
So meter is used to remove this mystification.
If it is used as SI unit there would be a state of uncertainty because if something is large for someone then it would be small for the other.
So meter is used to remove this mystification.
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