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From: britt@adapower.net (Britt Snodgrass)
Newsgroups: comp.lang.ada
Subject: Re: Dimensionality Checking (Ada 20XX)
Date: 10 Dec 2001 12:38:14 -0800
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Ian0Kerr@my-deja.com (Ian) wrote in message news:<eb48e9c0.0112100557.51184bda@posting.google.com>...
> "Nick Roberts" <nickroberts@adaos.worldonline.co.uk> wrote in message news:<9v0crt$bo2bi$1@ID-25716.news.dfncis.de>...
> > I'm liking this idea a lot!
>  
> > Three further notes need to be made.
> > 
> > (1) I am not sure if the (seven) SI units I have presented are the complete
> > set of basic units required in reality.
> 
> The standard reference was "H.S. Hvistendahl, Engineering Units and
> Physical Quantities,Macmillan, 1964. Anyone have something more up to
> date

"Units and Conversion Charts" by Theordore Wilde, published by IEEE
press. I have the very useful 1991 edition but there is apparently an
updated 1994 edition available from Fatbrain.com at
http://www1.fatbrain.com/asp/bookinfo/bookinfo.asp?theisbn=0780310500&vm=

> 
> There were only 6 fundamental Units in MKS are
> Length                    L
> Mass                      M
> Time                      T
> Thermodynamic Temperature Big-Theta
> Electric Current          I
> Luminous Intensity        ?
> 
> He also uses Free Energy  LF
> What is nr 7 I forgot.

Amount of substance (SI unit is the "mole")

> 
> Also Angle                [L]-superscript-o so it really is related to
> length.
> 
> > (2) Dimensional analysis could extend (from the basic MLT) to temperature,
> > amount of matter, and electrical current. But I don't know if it would be
> > practical for these 'extra' dimensions (or any others) to be included in the
> > checking.
> 
> Ian