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Subject: Peter Rusch: Value with no uncertainty
From: CCCE ConfChem <[log in to unmask]>
Reply-To:CONFCHEM <[log in to unmask]>
Date:Mon, 1 May 2017 13:41:53 -0500

text/plain (36 lines)

To reply: [1]

The science of metrology is all about traceability and uncertainty.  Usually
the variety of measurements of any physical constant group around a central
value; often these values are assumed to be in a Gaussian distribution.
 Once the value of each of the defining physical constants is selected it
will be assumed to have no uncertainty.  Similar to the mass of carbon-12
that is 12.0000000000000...  Each value will have it's own number of
significant digits.  The currently proposed values are listed in the draft
of NISTS's Brochure 9  for the SI. It's in draft as the values are fully
accepted by the International Conference on Weights and Measures that
willmeet in 2018.  

You are correct.  I don't know how that could be missed in the paper., 


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