Tubes with inert gases excited with high voltage. From left to right: Helium, Neon, Argon, Krypton and Xenon. Each tube emits a different color and in
Tubes with inert gases excited with high voltage. From left to right: Helium, Neon, Argon, Krypton and Xenon. Each tube emits a different color and intensity.
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Photo credit: © Kim Christensen / Alamy / Afripics
License: Royalty Free
Model Released: No
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