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What is a Quasi-Conductor ?

  1. Jun 21, 2011 #1
    Hey I have read in a book that in moisture sometimes the cars or vehicles ignition failure occurs and it(vehicle) stops.(I mentioned sometimes in rare cases. )The reason written there was that the insulating porcelain of the spark plugs accumulates a film of dirt . The surface dirt is hygroscopic and picks up moisture from air. Therefore in humid weather the insulating porcelain of plugs becomes "quasi-conductor." This allows an appreciable proportion of the spark to leak across the surface of the plug instead of discharging across the gap .

    Firstly , is the explaination correct ?
    Secondly , what exactly is this quasi-conductor ?
  2. jcsd
  3. Jun 21, 2011 #2


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    Staff: Mentor

    Sounds like they are just referring to the fact that in humid weather the water in the air gets absorbed into the dirt and causes it to become conductive enough to cause a short. I don't know if the explanation is actually correct, and I've personally never heard of a quasi-conductor before.
  4. Jun 23, 2011 #3
    Hmm I still have the doubts whether it is correct or not .
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