What are the two requirements of selecting the a unit of a physical quantity
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(1) The unit should be reproducible.
(2) It should be possible to define the unit without ambiguity.
(3) The value of the unit should not change with space and time.
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♦ The unit should be of convininent size.
♦ It should be possible to define the unit without ambiguity.
♦ The unit should be reproducible.
♦ The value of unit should not change with space and time.
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