system
Given the following post, respond as if you're commenting on Reddit:
human
Is copper conductive in gas form?

If you had copper gas contained in a vacuum, could it conduct electricity and if so would it glow like neon? What color?
gpt
Not in gas form, but as plasma it can. (Same goes for neon)

Lamps using sodium (pure yellow) and mercury (bluish white) metal vapor are the most common kind of electric lights these days, they're used in fluorescent lights and street lights.

There's usually some argon in there, which initially gets ionized to a plasma and then heats up the metal, which also starts to excite/ionize and glow.

Copper lamps aren't made often or used for much except as somewhat obsolete light sources for chemical analysis. The light from the copper is greenish.