[time-nuts] Standards for units

Magnus Danielson cfmd at bredband.net
Tue Apr 3 05:10:20 EDT 2007

From: Chuck Harris <cfharris at erols.com>
Subject: Re: [time-nuts] Standards for units
Date: Mon, 02 Apr 2007 22:09:49 -0400
Message-ID: <4611B76D.6080303 at erols.com>


> > The other inch defined by
> > 
> > 1 inch = 25.4mm exactly
> > 
> > is used for everything else.
> My recollection when I posted the earlier letter was 24.5 mm/inch was
> exact by definition, and I recalled that 39.37 inches/meter was also
> exact... a quick calculator check to 6 figures showed that it was exact,
> then I tried to 9 figures, and saw that pesky little 0.000000051.

I was telling you that it was of by about 2 ppm.

> > For confirmation read the appendix C of NIST Handbook 44, where these 
> > and other units of measurement are described.
> > Why on earth one has to have different units all called barrels for oil, 
> > cranberry juice, dried fruits, liquor (this one varies from state to 
> > state) etc., defies imagination.
> I think the biggest push for metric is the chance to start fresh.  But
> when metric includes piezes, and poises, and sthenes and steres and stokes...
> I guess it ain't all that fresh.

Where did you get that from?


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