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Homework Help: A noble question

  1. Nov 2, 2004 #1
    This may be more of a chemistry question than a physics one, but why does glass tubing filled with a noble gas emit coloured light when electric current flows through the tube. Being inert I would've thought they would be the least likely substance to exhibit such a property.

  2. jcsd
  3. Nov 2, 2004 #2


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    Science Advisor

    Why would you think that? Being "noble" means that it does not react with other elements, not that it doesn't "lose" electrons.
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