Ion mobility in a solution is very strongly dependent on temperature, as
the the generation of OH H radicals in pure water. These are what makes
the water conductive so current can flow. When it is cold the
conductivity goes down ( resistance goes up ), so you get less current,
and things happen more slowly.
Marshall
Dorothy Fitzpatrick wrote:
Thanks for that Ode...I will keep so I can refer to it when I get asked such a
question again. I have noticed that a 500ml jar takes about five or six hours
now...whereas in the summer, it only took three. I had deduced it was the
temperature, but not the 'why.' dee
On 15 Feb 2010, at 11:31, Ode Coyote wrote:
Cold water seems to be having more of an effect this year than ever
before...likely because people are cutting back on heating bills and it's,
well..colder this year than it has been since the globe got so hot that we're
all about to go extinct.
Cold water is less conductive than warm water and also has a lower saturation
point.. ie..will hold fewer Ions as Ions and will hold more in dissolved gasses
that might react with the ions it does hold to make them non ionic, thus not
adding to a conductivity gain.
Many chemical processes have thermal thresholds, so it's possible that only one
degree difference in temperature could have a really big effect [dunno]
Polarity changing is only slower because some portion of the time right after a
shift is spent getting the electrochemistry to reverse itself and nothing much
'moves'.
That part is pretty much a constant.
The longer the time periods between a shift in polarity, the more time spent
doing the same thing and the closer to DC the process times get...but.. getting
those longer times makes an RC timer circuit less stable unless you can up the
capacitor values to work well with the resistor values and bigger capacitors
get really big, size wise, really fast and the more effect a +/- 20% accuracy
rating on a capacitor has between otherwise identical circuits. [20% of 1410 uF
is a lot more than 20% of 300 uF]
--
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