Lalit said:
Hi all,
How can one determine the resistance of a given sample of water ?
Can a multimeter be safely used for the purpose ?
The resistance must be varying as we increase or decrease the distance between the terminals ?
Regards,
Lalit :roll:
#1 Can a multimeter be safely used for the purpose ? absolutely yes
#2 The resistance must be varying as we increase or decrease the distance between the terminals ? Yes, resistance will vary if you move the probes.
A couple of ideas, Always use the lowest current possible to avoid eloctrolysis
and use the most inert probe material you can find ( gold, nickle, stainless steel, carbon rods out of batteries, etc.) Probe metals should always be the same for + and - probes
keep the probe spacing and current flow the same between water samples
(the highest ohm reading on your meter, like 1K or 100K or 1Meg, higher the better)
Make sure containers are very clean before filling with new water sample.
Hope this helps a little, good luck on your project, let us know your results please! Tony