Talk:Electrical conductivity

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I noticed that the table of SI electromagnetism units was on several entries, so I think I'll make an entry just for it and then put a link to it at the bottom of the entries that it used to be in

Measuring Electrical Conductivity in Fluids

Measuring the conductivity of a metal rod is relatively simple, but how do you measure the conductivity of a fluid? Will a horizontal glas tube with facing(inert)platimum disk-electrodes at each end (so you can calculate the length and area of the fluid column do the trick? One can then apply a AC voltage accross the electrodes and measure the current to calculate the resistance of the fluid column and hence calculate the conductivity of the fluid.

What is the recommended practice?--168.209.98.35 20:24, 9 December 2005 (UTC)G Francois Marais[reply]

Electric conductivity measuring instruments for liquids are commercially available from laboratory equipment suppliers. After calibrating the instrument the probe containing the measuring cell is simply immersed in the liquid for a digital readout of the conductivity and the temperature (conductivity varies with temperature).--168.209.98.35 15:41, 14 December 2005 (UTC)G Francois Marais[reply]

Electrical expreiments with potatoes

I seem to remember in high school science, something about potatoes being used as conductors or like a primative battery. Am I wrong?209.74.5.35

You can use a potato as a battery. This should be disussed under battery, if it isn't already. --Heron 15:30, 25 March 2006 (UTC)[reply]

Table of conductivity and resistivity

I propose that we combine the tables of conductivity and resistivity onto their own page, because they are fundamentally related. Comments? Fresheneesz 22:44, 27 May 2006 (UTC)[reply]

Agreed. — Omegatron 19:02, 24 February 2007 (UTC)[reply]

Electrical Conductivity: Gas

I have something on my mind that I want to clarify. Is there a gas that can conduct an electrical charge were it will move within that specific gas only/mostly? - Johan1984

Lightning - Rip-Saw 10:43, 21 August 2007 (UTC)[reply]

Temperature Dependance

The formula seems not quite right. It causes most conductivity to increase with temperature instead of being reduced. As far as I can tell the T and the Tprime are out of order. 63.164.202.130 14:35, 30 August 2007 (UTC)63.164.202.130 14:33, 30 August 2007 (UTC)rfilabs[reply]

This is because the formula is for semiconductors, where electrical conductivity increases with increasing temperature. The formula is for calibrating an EC water meter using a calibration solution. Different EC meters use different slopes. This section probably needs a bit of tidying and sectioning to specify the EC dependence for metals and semiconductors (such as water). +mt 01:09, 28 May 2008 (UTC)[reply]

Current Density or Free Current Density

I suppose there's an imprecision on the definition of the electrical conductivity:

"The conductivity σ is defined as the ratio of the current density J to the electric field strength E"

I believe it must say: ...the ratio fo the FREE current density etc..

since the total current density depends on the free and the bounded current (see Magnetization).

--Felipebm (talk) 16:00, 7 May 2008 (UTC)[reply]