Homebrew PCBs

On Mon, 27 Nov 2006 20:10:53 +0100, Bert <bertd.geo@...> wrote:

> I get 91% for cheap at either target or WalMart and it owrks for most
> general purpose applications. No good for things like video heads and
> other sensitive applications though.
> I used to always get 99% at the local Snyders Drug store for still a
> reasonable price (few bucks for a pint). I haven't checked recently
> (still have quite a lot on hand) but I think they still sell it. If
> it's not on the shelf, ask at the pharmacy counter. I'm sure they can
> order it and Snyders has always been easy to work with.


I was wondering, can one accurately measure the purity of IPA or ethanol  
by measuring the density?
Like measuring volume and weight, or using a hydrometer?
I recently found a 0-100% ethanol hydrometer, but i'm wondering if the  
measurement would tell me much, what if the other ingredients are not  
water? What if they have a density other than 1kg/l, then the measurement  
would not tell me the purity?

ST