[EMAIL PROTECTED] wrote:
....
> The SI brochure has used the phrases "SI units" and "units of the SI"
> to separate coherent from non-coherent units. These words have been
> a problem. For example, millimetre was not an SI unit but was a unit
> of the SI. So, the CCU has proposed new text, not yet adopted by the
> CGPM, to say all units, base, derived, and prefixed, are SI units.
> Note that the prefixed units are not coherent (except kilogram).
Robert, I'm not certain that this decision will have to go before the
CGPM. I think that the CIPM can make this ruling on its own, due to its
editorial nature. At least that's the impression I gained at the IEEE
SCC14 meeting last Friday, where Barry Taylor reported as our nation's
CCU representative. (The CCU writes the SI brochure and the BIPM
publishes it, both on behalf of the CIPM.)
....
> I proposed text be developed to answer this to the joint IEEE/ASTM
> committee revising SI 10, the ANSI standard on SI for the USA. The
> committee declined to treat this matter. So do not look for the
> answer in the revised SI 10 soon to appear.
Since, at that meeting, we were discussing putting into print (in SI
10) essentially what CIPM has ruled informally, we decided to wait until
that ruling appeared in print from the BIPM. That is, we decided to wait
until the SI brochure change was published. That may be much sooner than
the next CGPM meeting which is a few years off.
> I suggest that the following be standard boiler plate text for
> contracts and specifications:
>
> "Use SI units. SI base units, SI base units with
> prefixes, SI derived units, and SI derived units
> with prefixes comply with this requirement. Further,
> the non-SI units listed in Tables 6 and 7 of the SI
> brochure and hectare comply with this requirement."
I think that your suggested boiler-plate is excellent, Robert.
> Notice that "form" and "modern" do not appear.
Nor does "metric system". And there is no need for it to appear here!
Jim
--
James R. Frysinger
Lifetime Certified Advanced Metrication Specialist
Senior Member, IEEE
http://www.cofc.edu/~frysingj
[EMAIL PROTECTED]
[EMAIL PROTECTED]
Office:
Physics Lab Manager, Lecturer
Dept. of Physics and Astronomy
University/College of Charleston
66 George Street
Charleston, SC 29424
843.953.7644 (phone)
843.953.4824 (FAX)
Home:
10 Captiva Row
Charleston, SC 29407
843.225.0805
