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Capacitor with bottle, water & salt




I plan to build my own capacitor rather than buying one. I saw many
interesting plans for caps made with bottle with a slat-water solution in
it and that's what I'm planing to build. But I have a question: With high
voltage in salt water, don't you have decomposition of the water in oxygen
and Hydrogen, which can lead to an explosion??? and... How can you find to
capacitance of such a cap... It is not as easy as with a plan or spheric or
cylindrical cap...
  
Any other idea for an home-made cap would be welcome...
  
Sam