🚀 go-pugleaf

ag129@cus.cam.ac.uk (Alasdair Grant) writes:

>In article <1i9j4gEINN8nd@uni-erlangen.de> mskuhn@immd4.informatik.uni-erlangen.de writes:
>>1 inch is 25.4000000 mm.

>1 SI inch is 2.54mm _exactly_, not just to 7 decimal places.
                  ^^ you mean centimeters (cm), don't you?

Of course, you are right. My intention was to write

    1 inch is 25.4000000... mm.     :-)

This inch is still used in metric europe for e.g. diameters of water
pipes and most dimensions in electronics are 2.54 mm (1/10 SI inch)
multiplied by something.

>I believe NIST inches are a standard unit in HyTime.

In HyTime (according to a recent CACM article) 1 inch is _exactly_
25.4 mm = 2.54 cm = 0.0254 m. Remember, HyTime is an ISO standard
and ISO standards only use the SI system defined in ISO 31.
(e.g. ISO 31-1:1978 Quantities and units of space and time)

Markus

-- 
Markus Kuhn, Computer Science student -=-=- University of Erlangen, Germany
Internet: mskuhn@immd4.informatik.uni-erlangen.de  |  X.500 entry available
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