explain why hand span cannot be used as standard unit of length
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Footstep and handspan both differ in different people.If this would be used as SI unit there would be a lot of confusion because if something is large for someone then it would be small for the other.So meter is used to remove this confusion.
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This is because somebody has long and somebody has short hand and long handed man can get more land but short handed can't get enough land because of his short hand .To remove this difference metre is used as SI unit of length.
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