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Re: OT / Lightning Rods
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Posted by KEB on July 24, 2007 at 18:20:41 from (72.19.170.5):
In Reply to: Re: OT / Lightning Rods posted by havvey on July 24, 2007 at 06:05:11:
No, there are not two "types" of lightning. All direct effects of a lightning attachment are thermal. If lightning hits a tree or some object containing water, the heat generated by the lightning current vaporizes the moisture into steam. Its the pressure of this steam that causes an "explosion". Other structures containing materials that can be vaporized experience similar effects. Lightning will start a fire when the there is enough energy deposited into the material its passing through to raise the material temperature to the ignition point. Depending on how flamable the material is, a fire may or may not sustain itself once the lighting stike is over. Keith
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