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Published on Dec 31, 2006
Time lapse video of classic demonstration of osmotic pressure using a thistle tube, dialysis tubing and sugar solution. Part way through, the liquid in the tube rises out of view -- but we spotted it and repositioned the camera. At the very end, the membrane springs a leak and the column of water goes back down.
Here's a secret. My daughter and I made this video so she would not have to monitor the thing and record all the details in her lab notebook.