On Wed, 23 Jun 2004 05:54:00 +0000, Charles wrote:


Unfortunately it is geared to seawater concentrations. If we take 100
grams of water and add 1 gram of salt, we would have a 1% solution. We
are doing this at the temperature where 1 cc of water weighs 1 gram,
whatever that is.

Assuming the solution doesn't change volume (it could increase, decrease,
or remain the same)we would have 100 cc that weigh 101 grams.

101/100 = 1.01 specific gravity.

Another way to figure is 99 grams of water and 1 gram of salt to get 100
grams of solution.

100/99 = 1.01010101...

So 1.001 for 0.1% sounds right, ignoring all the variables that are too
small for us to measure anyway.

Thanks for this explanation it makes it a lot clearer. I will also be
having a look at those websites you recommended

Trev