what means:value of unit should not change with space and time
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it means that the value of the unit should not change with space and time.
 Janaranjan Das Kumar Das answered this. if there is any change in unit there may be change in power of 10 of its magnitude.
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Explanation:for measuring we need a standard reference that reference is only unit so it is important that it does not changes and is independent of conditions so that it can be used to compare of the
given physical quantity.
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