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S̵̢̡̠̣̜͍̘͍̈́̿͒̈̎̉͌͂̎̾̓Ḩ̶̡̛̯̰̤̻͖̹̝̼͍͔̰̃̅̋̍̈̆̋̋́̔͝Ǫ̴̺͔̫͈͉͎̤͎͗͂̅͒̀͒W̶̛͖̺̰̠̙̲̓͆̋̉̌̆̂͛̀̒̕͘ ̷̨̦̤̇̀̓̉́̅͒̄͝M̶͓̗͚̩̬͈͎͗̓̈́́͜͜Ẹ̵̢̢̺̞͓͓̤͙̙͖̈́̈̉͝ ̶̧̡̲̺͓̮̰̘̮͚͉̝͈̝̀͒́̎̾̓͜͝͝͠T̷̡̟̘̫͋͋̑͊̓͐̊̐̎H̸̪̋͛̓̀̍̂̐̂͐̾̈́̒̃É̵̛̾̅̀͛̃̄̏
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With sufficient voltage, everything is a conductor.
With insufficient voltage, everything is an insulator.
Neither may be conducive to those roles, but everything has some conductivity and some resistance (super conductors being a possible exception).
How about in vacuum? Do you get fancy arcs or glows or what?
In typical conditions, an electrical arc forms when the electric field strength exceeds the dielectric strength of the medium (like air). In a vacuum, there is no medium to ionize, which theoretically makes it difficult for an arc to form. However, electricity can still arc in a vacuum under certain conditions, such as when high voltages are involved or when the electrodes are extremely close together.
I was thinking neon lights. I mean that's basically an arc, just spread out. I think I heard that there's a glow in vacuum too, just not as nice as with neon.
Well, a quick search turned up this: Vacuum Arc
However, like the above comment, it seems to refer to freeing electrons from the conducts, so, IMHO, you no longer have a vacuum.
If you could somehow maintain a perfect vacuum; I wonder how this concept Virtual particle would come into play (or if it would at all).