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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?
https://peacepower.ca/faqs/can-electricity-arc-in-a-vacuum#%3A%7E%3Atext=In+typical+conditions%2C+an+electrical%2Celectrodes+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).