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If I have a hollow insulating cylinder (has a diameter of 5 cm and a length of 14 cm) with two (conductive) sharp metal point contacts at each end (measuring 2cm each leaving 10 cm exactly between the points). Inside the cylinder is normal atmosspheric pressure of standard air.

How do I calculate how many volts and amps I require to have a continuous electric arc between the contacts?

Thanks for your help and all answers are welcome.