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For those of you interested in the definitions of SI Units
(Bill Hooper is certainly among them.):
There is an article in Physics Today on more precise
re-definitions by the CGPM in the 2010-2011 time frame.
The two contenders for a new definition of the kilogram are
(a) linkage to the Avogadro Constant by the counting of
atoms in a sphere of silicon, and
(b) linkage to results from the Watt Balance of electrical
and mechanical powers.
See: Physics Today, 2006 April, pp. 32 and 33, or search
<www.physicstoday.org>.
Gene Mechtly
University of Illinois
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