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Re: [Phys-L] Hydrometer (was Hygrometer)




On 2014, Apr 24, , at 07:46, brian whatcott <betwys1@sbcglobal.net> wrote:

[Phys-L] Hygrometer

* /From/: brian whatcott <betwys1@sbcglobal.net
<mailto:betwys1%40sbcglobal.net>>
* /Date/: Wed, 23 Apr 2014 11:12:16 -0500

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I bought a brine hydrometer the other day. At a garage sale. It was marked 0 - 100% at 60degF. So I found a tall glass vase and put a half inch of salt into it and filled it with water.

The hydrometer read close to 100% so I was satisfied with my $2 purchase.

A day later, there was a thin crystalline film on the stem. A week later, a thick encrustation. I was surprised. Reminded me of the beginning metaphor for thermionic current. Perhaps it would make a slow rectifier? Is there a ready explanation for the salt transport?

Brian Whatcott Altus OK Indian Territory.

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Puzzled; did it become supersaturated on cooling and evaporation?

bc v. puzzled.