Why is a foot step, or a hand span, not used as a standard unit of length?
CLASS 6
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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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as said the length of hand and foot differ from person to person.There are more instruments which are more accurate and useful than handspan and foot, it is no more used as SI
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