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Triboelectric tube.
An example of the element Mercury

Sample Image
Mercury Triboelectric tube
Triboelectric tube.
This is a partially evacuated tube containing about 100 Torr of neon gas and about 5 grams of mercury. In a very dark room, after giving your eyes time to adjust, you can see flashes of light where the mercury is separating from the glass as the tube is rotated. Very strange.
Source: William Kolb
Contributor: William Kolb
Acquired: 12 August, 2004
Price: Donated
Size: 3"
Purity: 99%
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