Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Discovery of cathode rays

  1. Oct 8, 2012 #1
    why current does not flow through gas in discharge tube at ordinary pressure?
  2. jcsd
  3. Oct 8, 2012 #2


    User Avatar

    Staff: Mentor

    You have to show your attempts at solving the question to receive help. This is a forum policy.
  4. Oct 8, 2012 #3


    User Avatar
    Gold Member

    Gases are not supposed to conduct electricity when you leave the power switch on. If it were so, you wouldn't had asked the question.

    Gases are insulators of electricity, since they can't conduct electricity as they lack free electrons or free ions.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Discovery of cathode rays
  1. Cathodic protection (Replies: 13)