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The inert gas Helium (He) seen in a discharge tube emits light due to an electric field. Stock-Foto | Adobe Stock
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Gas-filled tube - Simple English Wikipedia, the free encyclopedia
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. Stock-Foto | Adobe Stock
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