Excerpt from A Key to Shaw's Physics by Experiment
The needles are held in position because the surface tension between the two needles, tending to draw them together, is just equal to the surface tension on the outside, tending to draw them apart. The alcohol breaks the sur face tension between them, and the surface tension from the outside pulls them apart.
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PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000. Artikel-Nr. LW-9780282902391
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