Re: Electroscope Materials

On Sat, 21 Jun 2008 20:49:59 +0100, "christofire"
<christofire@xxxxxxxxxxxxxx> wrote:

"Jeff Liebermann" <jeffl@xxxxxxxxxx> wrote in message
news:6ptn54156eh5n6g67kt4aqim2d84hblqhs@xxxxxxxxxx
On Fri, 20 Jun 2008 12:36:29 -0500, "amdx" <amdx@xxxxxxxxxxx> wrote:
Aluminum is MUCH
easier to handle than gold, but because it weighs more, is less sensitive.

Huh? Aluminium weighs more than gold? Am I in the wrong universe?

I said weight, not specific gravity or density. Hammered gold leaf is
about 0.1 micro meters thick. Aluminum foil that thin would just
crumble or shred itself. I think the best I can find for aluminum
foil is rolled (not hammered) at about 1,000 micro meters thick.
That's about 10,000 times as thick as gold.

The electrostatic forces on each leaf are repelling each other, but
are also fighting gravity. The flexibility and weight of the material
is a key part of how much they move and thus their sensitivity.

<http://en.wikipedia.org/wiki/Electrometer>

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