what do you think will happen ?

Thread Starter


Joined Jul 26, 2004
This one's about some electrostatics within a capacitor. If I had 2 parallel metal plates each coated with a thin insulating layer and sea water filling the gap between the plates, what do you think happens to the capacitance ? As, I go on adding more salt to it, what should be the variation in the capacitance of the arrangement ?

David Bridgen

Joined Feb 10, 2005
Any impure water is conductive, seawater especially so.

Filling the gap with a conductive medium reduces the capacitance, and, in this case, since it isn't a perfect conductor it would be a very lossy capacitor too.


Joined Apr 20, 2004

I don't want to sound impertinent, but why not try the experiment yourself? Let us know the result, by all means.

As you have described it, the setup should be easy to do using mostly kitchen stuff.