Ink Rings in a Glass of Water
A Moment of Science

Ink Rings in a Glass of Water

B2Upper-intermediateOctober 9, 20262 min
  • Science

Ink Rings in a Glass of Water

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Sentence 4 of 12 · 0:19

you fill the glass with water, put it on a steady table and leave it along for a

.

some ink in the eyedropper and release one drop from a height of one inch above

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A1 32%A2 45%B1 14%B2 9%C1 0%
  • 91% of the words are B1 or easier.
  • 174 words a minute: natural, fairly fast speech.
  • 12 harder words (B2 and up) in the whole episode.

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0:00

Make an ink ring and a glass of water in this moment of science. You need a tall glass of water, the taller the better, a bottle of ink, and an eyedropper. After you fill the glass with water, put it on a steady table and leave it along for a few minutes to allow all the turbulence in the water to settle down. Now take

0:24

some ink in the eyedropper and release one drop from a height of one inch above the center of the water. The ink will form an expanding ring descending through the water like a smoke ring traveling through the air. The ring keeps its shape because of the way water moves in it. You can get the idea by thinking of a rubber O-ring, maybe something

0:46

like the rubber rings that are used as drive belts in upright vacuum cleaners. You can twist one of those rings inside out without changing its overall circular shape. What's happening with with the water is something like that. The ink ring that you see is actually turning itself

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