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## Main Question or Discussion Point

i've been reading on plasma physics and i have a couple of questions.

how to calculate how much volts needed to create plasma with distance x from the electrodes of a certain gas with certain pressure?

and to increase the distance do i have to increase voltage or once i have an arc or plasma in a tube i can just increase the distance without increasing voltage?

what are the equations used? in account for the density of the gas and it's pressure.

how to calculate how much volts needed to create plasma with distance x from the electrodes of a certain gas with certain pressure?

and to increase the distance do i have to increase voltage or once i have an arc or plasma in a tube i can just increase the distance without increasing voltage?

what are the equations used? in account for the density of the gas and it's pressure.