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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Kilogram constant defined in package System.Dim.Other_Prefixes
 (s-dmotpr.ads)
Date: Tue, 04 Feb 2014 19:19:27 +0100
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Date: 2014-02-04T19:19:27+01:00
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Anh Vo <anhvofrcaus@gmail.com> writes:
> The Kilogram constants defined in package System.Dim.Other_Prefixes
> (s-dmotpr.ads) look different compared to others such as Meter,
> Second,... In addition, the values do not match with names in the
> comments on the right side. I would like to know why. By the way, the
> Meter, Kilogram and Second constant are repeated here for easy
> discussion.

Because the base SI unit for weight is not gram, it is kilogram.  This
explains the difference in exponents.  Also, in s-dimmks.ads, note how
the gram is defined:

   ug  : constant Mass := 1.0E-09;  -- micro (u)
   mg  : constant Mass := 1.0E-06;  -- milli
   cg  : constant Mass := 1.0E-05;  -- centi
   dg  : constant Mass := 1.0E-04;  -- deci
   g   : constant Mass := 1.0E-03;  -- gram
   dag : constant Mass := 1.0E-02;  -- deka
   hg  : constant Mass := 1.0E-01;  -- hecto
   Meg : constant Mass := 1.0E+03;  -- mega


-- 
Ludovic Brenta.