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Re: re Mineral Spirits (water conductivity)
just thought i'd add my 2 cents worth
Yes, DI water conducts electricity. The pure stuff splits up (by
itself) and has a resistance of about 18 megoohms (and this is only
acheived with about $10,000 worth of filters). The stuff you buy at
Hinky Dinky probably conducts a whole lot more due to dissolved
organics, salts, etc. So, unless you want to spend 6 mothes salary on
water filtration, don't use DI water in the presence of high AC voltage.
(Anyway, it's a bad idea) :-)
Ross Andrews
>
> -----Original Message-----
> From: Tesla List [mailto:tesla-at-pupman-dot-com]
> Sent: Saturday, February 27, 1999 11:29 PM
> To: tesla-at-pupman-dot-com
> Subject: RE: re Mineral Spirits (water conductivity)
>
> Original Poster: "Coiler" <mycroft-at-access1-dot-net>
>
> Jim:
> Are you certain of this? That D.I. Water will actually conduct enough to
> be a problem? The fact that the water will attack and ionize any metal to
> become conductive being put aside, I thought DI water had resistances on the
> order of megaohms?
> Methinks the problem is that the water refuses to remain DI. We deal with
> this all the time on our synchrotron and related beam transport systems.
> We use DI water to cool our buss lines,power supplies and magnets - the
> water
> ciruculates in the windings - but it takes constant work to keep it that
> way,
> and our resin modules are treated as toxic waste (Lots of dissolved copper
> from
> the buss bars.) This is DC at low V (usually under 50) but high I (on the
> order of 2500A) Perhaps this is why we get away with it..
> Just a comment from the peanut gallery.
>
> Michael Baumann
> Coiler, Homebrewer, Nerd. mycroft-at-access1-dot-net
>
> > -----Original Message-----
> > From: Tesla List [mailto:tesla-at-pupman-dot-com]
> > Sent: Saturday, February 27, 1999 12:35 PM
> > To: tesla-at-pupman-dot-com
> > Subject: Re: re Mineral Spirits (water conductivity)
> >
> >
> > Original Poster: "Jim Lux" <jimlux-at-jpl.nasa.gov>
> >
> >
> >
> >
> > > Original Poster: Chris Tominkson <internetinbox-at-yahoo-dot-com>
> > >
> > > I heard from my oceanography teacher that pure water, just one
> > > Hydrogen atom and 2 Oxygen, don't conduct electricity. He said that it
> > > is the minerals and other stuff in water that conduct electricity. So
> > > could you use distilled water for poly-rolled caps?
> >
> > This one comes up pretty often.. especially because water has a dielectric
> > constant of 82, making for a lot of C in a small volume.
> >
> > Sadly, water isn't actually an insulator. If you put DC on it, it does
> > conduct, as the water is electrolyzed into hydrogen and oxygen. However,
> > for short pulses, it is an insulator, so it is used in fast transmission
> > lines with HV pulses (like the Sandia Z-machine, for instance).
> >
> >
> >
--
A housewife, an accountant and a lawyer were asked "How much is 2+2?"
> The housewife replies: "Four!".
> The accountant says: "I think it's either 3 or 4. Let me run
> those figures through my spreadsheet one more time."
> The lawyer pulls the drapes, dims the lights and asks in a hushed
> voice, "How much do you want it to be?"