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A voltage is applied and the gas atoms in the tube light up. The color of the light reveals which gas it is.

A voltage is applied and the gas atoms in the tube light up. The color of the light reveals which gas it is. 1
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Links

  1. https://www.physik-astro.uni-bonn.de/en/news/prof-klaus-desch-macht-den-auftakt-zu-der-kinderuni-im-sommersemester-2024/uni-vl-kinderuniw-150424-055.jpg/image_view_fullscreen
  2. https://www.physik-astro.uni-bonn.de/en/news/prof-klaus-desch-macht-den-auftakt-zu-der-kinderuni-im-sommersemester-2024/uni-vl-kinderuniw-150424-055.jpg/@@download/image/uni-vl-KinderuniW-150424-055.jpg