Citation stating the maximum conductivity or resistivity of
Electronics Forum Index Electronics
Circuits, theory, electrons and discussions.
 
 FAQFAQ   MemberlistMemberlist     RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 
Google
 
Web ElectronicsHelp.net
Citation stating the maximum conductivity or resistivity of

 
Post new topic   Reply to topic    Electronics Forum Index -> Equipment
Author Message
WayneL
Guest
Posted: Wed Jan 12, 2005 1:11 am    Post subject: Citation stating the maximum conductivity or resistivity of Reply with quote
Hi

Over the past week the has been so excellent feedback(threads) on my
question of water conductivity.
In a few thread the value of 18.3MR (0.055uS) was mentioned, forgive me for
being pedantic but could somebody help by quoting a reference that cites
this figure (either in ohms, mhos or Siemens)?

Cheers

Wayne

Back to top
Rich Grise
Guest
Posted: Wed Jan 12, 2005 1:55 am    Post subject: Re: Citation stating the maximum conductivity or resistivity Reply with quote
On Tue, 11 Jan 2005 19:11:23 +0000, WayneL wrote:

Quote:
Hi

Over the past week the has been so excellent feedback(threads) on my
question of water conductivity.
In a few thread the value of 18.3MR (0.055uS) was mentioned, forgive me for
being pedantic but could somebody help by quoting a reference that cites
this figure (either in ohms, mhos or Siemens)?


This might help you find some references:
http://www.google.com/search?q=%22resistivity+of+water%22

Good Luck!
Rich
Back to top
Tim Shoppa
Guest
Posted: Wed Jan 12, 2005 2:11 am    Post subject: Re: Citation stating the maximum conductivity or resistivity Reply with quote
Quote:
the value of 18.3MR (0.055uS) was mentioned

That's only at 25 deg C... in fact the actual value is both temperature
and pressure dependent.

Some relevant references:

http://www.hach.com/fmmimghach?/CODE:LG0055829%7C1//true

http://en.wikipedia.org/wiki/Self-ionization_of_water

Eigen, M. & de Maeyer, L. (1955) Untersuchungen über die Kinetik der
Neutralisation I. Z. Elektrochem. 59 986.

Geissler, P. L.; Dellago, C.; Chandler, D.; Hutter, J. & Parrinello, M.
(2001) Autoionization in liquid water. Science 291 2121-2124.

Stillinger, F. H. (1975) Adv. Chem. Phys. 31 1.

Rapaport, D. C. (1983) Mol. Phys. 50 1151.
Chen, S.-H. & Teixeira, J. (1986) Adv. Chem. Phys 64 1.

Tim.

Back to top
WayneL
Guest
Posted: Wed Jan 12, 2005 2:51 am    Post subject: Re: Citation stating the maximum conductivity or resistivity Reply with quote
Hi Can anyone send me a pdf of a paper (recent) to mail-nospam-@wlawson.
Remove -nospam-


Thanks again


Wayne
"Tim Shoppa" <shoppa@trailing-edge.com> wrote in message
news:1105474287.667040.184860@z14g2000cwz.googlegroups.com...
Quote:
the value of 18.3MR (0.055uS) was mentioned

That's only at 25 deg C... in fact the actual value is both temperature
and pressure dependent.

Some relevant references:

http://www.hach.com/fmmimghach?/CODE:LG0055829%7C1//true

http://en.wikipedia.org/wiki/Self-ionization_of_water

Eigen, M. & de Maeyer, L. (1955) Untersuchungen über die Kinetik der
Neutralisation I. Z. Elektrochem. 59 986.

Geissler, P. L.; Dellago, C.; Chandler, D.; Hutter, J. & Parrinello, M.
(2001) Autoionization in liquid water. Science 291 2121-2124.

Stillinger, F. H. (1975) Adv. Chem. Phys. 31 1.

Rapaport, D. C. (1983) Mol. Phys. 50 1151.
Chen, S.-H. & Teixeira, J. (1986) Adv. Chem. Phys 64 1.

Tim.
Back to top
Robert Baer
Guest
Posted: Wed Jan 12, 2005 12:59 pm    Post subject: Re: Citation stating the maximum conductivity or resistivity Reply with quote
Rich Grise wrote:
Quote:

On Tue, 11 Jan 2005 19:11:23 +0000, WayneL wrote:

Hi

Over the past week the has been so excellent feedback(threads) on my
question of water conductivity.
In a few thread the value of 18.3MR (0.055uS) was mentioned, forgive me for
being pedantic but could somebody help by quoting a reference that cites
this figure (either in ohms, mhos or Siemens)?


This might help you find some references:
http://www.google.com/search?q=%22resistivity+of+water%22

Good Luck!
Rich

Speaking about terminology, *silver* is most conductive, and
(relatively pure) water is rather NONconductive.
And "resistivity" is *NOT* interchangeable with "conductive" !!
What you should say is "the most *resistive*".
As far as units go, the common measure is for resistivity of water in
megohms.
Back to top
Dieter Britz
Guest
Posted: Wed Jan 12, 2005 2:24 pm    Post subject: Re: Citation stating the maximum conductivity or resistivity Reply with quote
WayneL wrote:
Quote:
Hi

Over the past week the has been so excellent feedback(threads) on my
question of water conductivity.
In a few thread the value of 18.3MR (0.055uS) was mentioned, forgive me for
being pedantic but could somebody help by quoting a reference that cites
this figure (either in ohms, mhos or Siemens)?

[reaches up to book shelf above desk, aha!]
Yes: Aylward & Finlay, "SI Chemical Data", p. 125 in the 2nd Ed.,
under Ionic Properties of Water. Note the SI units though, m, not cm.

I suspect the CRC "rubber bible" would also have it, but I have
only some rather old editions on the shelf.
--
Dieter Britz, Kemisk Institut, Aarhus Universitet, Danmark.
Back to top
Robert Baer
Guest
Posted: Thu Jan 13, 2005 2:28 pm    Post subject: Re: Citation stating the maximum conductivity or resistivity Reply with quote
Dieter Britz wrote:
Quote:

WayneL wrote:
Hi

Over the past week the has been so excellent feedback(threads) on my
question of water conductivity.
In a few thread the value of 18.3MR (0.055uS) was mentioned, forgive me for
being pedantic but could somebody help by quoting a reference that cites
this figure (either in ohms, mhos or Siemens)?

[reaches up to book shelf above desk, aha!]
Yes: Aylward & Finlay, "SI Chemical Data", p. 125 in the 2nd Ed.,
under Ionic Properties of Water. Note the SI units though, m, not cm.

I suspect the CRC "rubber bible" would also have it, but I have
only some rather old editions on the shelf.
--
Dieter Britz, Kemisk Institut, Aarhus Universitet, Danmark.

Correct; the CRC is stating the *SI* units.
BUT.
In the trade, the commonly used terminology (like i said) is
*megohms*.
Back to top
Dieter Britz
Guest
Posted: Thu Jan 13, 2005 3:16 pm    Post subject: Re: Citation stating the maximum conductivity or resistivity Reply with quote
Robert Baer wrote:
Quote:
Correct; the CRC is stating the *SI* units.
BUT.
In the trade, the commonly used terminology (like i said) is
*megohms*.

Sure. I just pointed that out, not as a criticism of your "Megohms"
but to avoid Wayne's getting confused by the figure in Aylward &
FInlay, of 5.5, rather than 0.055. The units for 5.5 are microS/m,
and the resistivity figure of 18.3 must be MOhm.cm. If Wayne is writing
a paper, he must be more pedantic than trade jargon.

--
Dieter Britz, Kemisk Institut, Aarhus Universitet, Danmark.
Back to top
Robert Baer
Guest
Posted: Fri Jan 14, 2005 1:55 pm    Post subject: Re: Citation stating the maximum conductivity or resistivity Reply with quote
Dieter Britz wrote:
Quote:

Robert Baer wrote:
Correct; the CRC is stating the *SI* units.
BUT.
In the trade, the commonly used terminology (like i said) is
*megohms*.

Sure. I just pointed that out, not as a criticism of your "Megohms"
but to avoid Wayne's getting confused by the figure in Aylward &
FInlay, of 5.5, rather than 0.055. The units for 5.5 are microS/m,
and the resistivity figure of 18.3 must be MOhm.cm. If Wayne is writing
a paper, he must be more pedantic than trade jargon.

--
Dieter Britz, Kemisk Institut, Aarhus Universitet, Danmark.

Check.
Back to top
 
Post new topic   Reply to topic    Electronics Forum Index -> Equipment All times are GMT
Page 1 of 1

 
 You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Home & Living New Topics
Powered by phpBB