what amount of electricity do i need?

Hello everyone,

I've been looking on the web for an answer to this question for while, but couldn't find a proper answer yet, hope you guys can help.

If I had two point charges, holding charges X and Y, the space between the 2 point charges is 1 Meter, and they were spaced by air between them.
What is the minimum amount of charge that these 2 point charges has to hold in order to have a spark between them? is there a rule that govern such a case?

Note: I saw online that the breakdown value for air is 30KV / cm, but i couldn't translate this into a charge (in coloumbs).

Also, i don't care what is the difference in charge between X and Y....


Thanks,