Homebrew PCBs

On Tue, 28 Nov 2006 00:35:27 +0100, Randy Ledyard  
<rll_groups@...> wrote:

> Stefan
> Yes you can, as long as we're talking a simple binary mixture of IPA and
> H2O. After that is gets complicated real quick....
> Density of IPA (also known as 2-Propanol) is 0.7855 g/ml @ 20C
> Density of H2O is, of course, 1 g/ml
> If you can measure the volume and the weight of the mixture, you can
> calculate the density of the mixture
> From this you can get the ratios of the components
> Let me know if you need more info on how to arrive at the ratios
> Randy


Thank you, I understand that.
What i was asking is if there are likely contaminants far off the density  
of water.
I have no means (and no intention) to analyze it exactly, but there is no  
point in going through with the hydrometer measurement if the result is  
meaningless.

I've weighed a bottle of IPA a while ago, using an identical bottle filled  
with water to the same level to determine the volume. But this process was  
not very accurate. Now that i found the ethanol hydrometer, i could use  
that (observing the tiny correction factor between IPA and ethanol).


ST