Relative Permittivity of Water

[Torana]

There are text books in every corner of the globe with permittivity figures ranging from 78.54 to 81 for water but unfortunately none of them reference the Laboratory source or any experiment to support the figures.
A simple test measuring 12 volts and amps reveals the resistance the water has to DC.
The theoretical resistivity of water is 182k ohms but in the real world of DC its a alot closer to
100 ohms for 1/16 inch gap.
Can anyone find info that shows tests that confirm non conductance of water ?
Trying to prove that the text books are correct is as hard as proving them wrong.

[fritznien]

pure water is non conductive. normal water is full of ions which carry charge.
easy to measure the increase in conduction as you desolve salt in water.

[TinselKoala]

The problem is that only very very pure water has high resistivity. The presence of ANY trace of ions in the water ... like from dissolved salts or even contaminated containers or measuring electrodes ... will make the water conductive and screw up your measurements.
In fact, resistivity testing is how ultra-pure water is characterized. If the resistivity is more than 10 MegOhms per centimeter, you can be assured that your distillation/purification process is working well.
There are lots of references listed on Google for resistivity testing and dielectric testing of water. For example,
http://www.astm.org/Standards/D1125.htm
Too bad it's not a free publication.

[Torana]

The text books refer to "pure" water which is irrelevant in the real world where there is no ultra pure highly filtered deionised water in nature.
Water left to itself is self ionising /auto ionisation / auto dissociation ,a solvent and pretty much everything else but PURE !!
The relative permittivity list should high lite the fact that water rated at 80 is such an isolated case that it shouldnt even be there for practical reasons.
Permittivity is part of electrostatics while electrolysis is in the same book under organic chemistry.

That said ..check out    http://www.powerlabs.org/waterarc.htm

[Torana]

What I shouldve said is : theres no Lab/text book example of a water capacitor for student replication.
Theres calculations etc for ceramic caps and problem solutions for students but nothing about water or pure water because they are obviously 2 different things.
That simple fact divides people.
It should state that Natural water has no relative permittivity simply because DC goes straight thru it .