Explain why hand span cannot be used as a standard unit of length.
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Answer:
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.
Explanation:
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1
Answer:
because it is differ from person to person
Explanation:
There are 3 factors we should consider when choosing a SI unit
- the unit should not be differ from person to person
- The unit should not be differ from time to time
- The unit should be to used as a standard
SI units are common to the whole world
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