From the HBD Archive
From: Nick Cuccia <cuccia@remarque.berkeley.edu>
Subject: g/l (re: mineral content of my water)
Date: 1992-06-02 17:23:55 GMT

One of the things that I love about the metric system is how all of the units
are tied together. An example of this is the relationship between mass,
volume, and length. One liter is (or was originally) defined as the volume
of a cube ten centimeters per side. A kilogram was defined as the mass of one
liter of water at four degrees celsius (the temperature at which water is at its
most dense at one atmosphere pressure). Note that because of a change in the
definition of the length of a meter (from a fraction of the distance from the
equator to the North Pole to the distance some number of waves travels, these
definitions are probably no longer exact, unless the defs of liter and gram
were altered, as well. The above is probably close enough for our purposes,
however.

Given this, a number with units g/l roughly gives you how many parts per
thousand of a compound or ion there are. Dividing this by 1000 gives you
parts per million or mg/l.

- --Nick

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