On 2011/02/21, at 03:25 , <[email protected]> <[email protected]> wrote:
> Pat, > > The fact you miss is that in "Scientific Metrology" there is no such thing as > "exactly the same" for the experimental comparison (calibrations) of two or > more *measurements* of any physical quantity (mass in particular). There is > *always* uncertainty in measured values of quantities. There can be *no > uncertainty* only in *numerical* definitions. e.g. one inch = 25.4 mm > exactly. > > At the same time, there is no doubt that the CIPM is attempting to make the > "new definitions" of the SI Base Units (to be based on numerical values of > certain fundamental constants ) as nearly as humanly possible to be > compatible with (identical to?) the older definitions based on > platinum-irridium artifacts. > > Gene. Dear Gene, Thanks for this information. I am aware of your first point. It is your second point that I am concerned about. I think that the CGPM, CIPM. or the BIPM needs to make clear statements on the value of the kilogram that they intend to aim for. They could do this after taking into account the points made by John Steele about the order of accuracy in a previous post. Cheers, Pat Naughtin Geelong, Australia > ---- Original message ---- >> Date: Sun, 20 Feb 2011 18:18:44 +1100 >> From: Pat Naughtin <[email protected]> >> Subject: [USMA:49890] Re: New BIPM web page on the "New SI" >> To: "U.S. Metric Association" <[email protected]> >> ,,, >> Dear Jim, >> , I have a concern. >> ...From these, it is not clear to me what the mass of >> the "new" kilogram is intended to be. Will it be the >> same as the mass of the kilogram as it was in 1799 >> and 1887? Will it match the current mass of the >> kilogram? Orwill it have some other value? > ... > Pat Naughtin LCAMS Author of the ebook, Metrication Leaders Guide, see http://metricationmatters.com/MetricationLeadersGuideInfo.html Hear Pat speak at: http://www.youtube.com/watch?v=_lshRAPvPZY PO Box 305 Belmont 3216, Geelong, Australia Phone: 61 3 5241 2008 Metric system consultant, writer, and speaker, Pat Naughtin, has helped thousands of people and hundreds of companies upgrade to the modern metric system smoothly, quickly, and so economically that they now save thousands each year when buying, processing, or selling for their businesses. Pat provides services and resources for many different trades, crafts, and professions for commercial, industrial and government metrication leaders in Asia, Europe, and in the USA. Pat's clients include the Australian Government, Google, NASA, NIST, and the metric associations of Canada, the UK, and the USA. See http://www.metricationmatters.com for more metrication information, contact Pat at [email protected] or to get the free 'Metrication matters' newsletter go to: http://www.metricationmatters.com/newsletter to subscribe.
