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

Breakdown voltage of dry air compared to humid air, how much of difference?

  1. Oct 28, 2006 #1
    How much will the humidity affect the breakdown voltage of air at STP.
  2. jcsd
  3. Oct 29, 2006 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    What makes you think it has any effect at all?

  4. Oct 29, 2006 #3

    Common sense?

    Humid air will have a much greater number of ions that can more easily facilitate a current through it.

    Also, the breakdown voltage of dry air is 30kV/2.54cm.

    I have a marx generator that has a maximum voltage of 55kV sparking over a distance corresponding to 100kV in dry air .
  5. Oct 29, 2006 #4


    User Avatar
    Science Advisor
    Homework Helper

    Starting here you might find some useful commentary on the subject

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook