On 2011-02-02 13:32, Gerard Ashton wrote:

 - the SI second is part of a coherent system of units and redefinition
   of the second would
   disturb the definition of most other units

   Right. Except of course for redefinitions that do not change the
   value of a unit, but only the method of its fundamental reproduction.
   This will doubtless happen to the second in due time, as it will
   happen within a few years for kg and A, probably for K, and
   possibly also for mol.

   Michael Deckers.
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