why is foot step or a hand span not used as a standard unit of length
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Because they can vary between people, because people's feet sizes and hand spaces vary. Hence there was a need for a standardized unit system which does not vary often.
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The size of the foot and hand varies from person to person. If footsteps or hand span of two persons are used to measure the length respectively, then the two distances may not be equal. Thus, a footstep or hand span are not the constant quantities. Hence, they cannot be used as a standard unit of length.
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