Bill Beaty wrote:
>
> But something weird is still going on.
>
> If conductive water on the pipe's inner surface gives a second "capacitor
> plate" with an equal and opposite (positive) charge, then as this water
> evaporates and the thickness of the layer decreases...  nothing should
> electrically change.
>
> The layer still contains a positive charge equal to the negative one on
> the outside pipe surface.  As the water finally dries out, the positive
> charge should remain on the plastic surface, strongly attracted there by
> the nearby negative charge.
>
Bill. Wouldn't the water vapor (or the O2 which has a high electron affinity) in the air flowing over the red hot hair dryer
heating element cause the loss of electrons to the air stream?
 
Psychrometric Applet:
 
http://www.linric.com/webpsysi.htm
 
The hair dryer would gain electrons back through the power cord. No?
 
A cheap Van de Graaff type electrostatic generator.   :-)
 
Frederick

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