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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

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    What makes you think it has any effect at all?

    AM
     
  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

    OlderDan

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    Starting here you might find some useful commentary on the subject

    http://www.pupman.com/listarchives/2003/November/msg00428.html
     
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