Physics Filter: Height of capillary rise
December 6, 2016 6:22 PM Subscribe
Where can I buy a glass capillary tube so narrow such that I can see the maximum capillary rise for water?
I was teaching a school student about capillary rise. In order to show it practically, I bought some of the glass capillary tubes available online. However the rise in them was very little. In order to show it better, I tried to find a narrower tube and got some glass microcapillary tubes. Here the capillary rise was more, but not as much as I expected. This piqued my interest further. Where can I buy a capillary tube as narrow as possible that would show the highest capillary rise? Of course, narrower the tube, the higher the capillary rise. Here I am just using a capillary tube and water from kitchen faucet.
I was teaching a school student about capillary rise. In order to show it practically, I bought some of the glass capillary tubes available online. However the rise in them was very little. In order to show it better, I tried to find a narrower tube and got some glass microcapillary tubes. Here the capillary rise was more, but not as much as I expected. This piqued my interest further. Where can I buy a capillary tube as narrow as possible that would show the highest capillary rise? Of course, narrower the tube, the higher the capillary rise. Here I am just using a capillary tube and water from kitchen faucet.
You may be able to make the capillary tubes you already have even smaller yourself, if you have access to a Bunsen burner: YouTube tutorial, written tutorial
posted by invokeuse at 7:53 PM on December 6, 2016 [3 favorites]
posted by invokeuse at 7:53 PM on December 6, 2016 [3 favorites]
Best answer: 0.130 mm/0.005" capillaries. You'd need a colored liquid to see that.
posted by halogen at 7:56 PM on December 6, 2016
posted by halogen at 7:56 PM on December 6, 2016
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posted by Dashy at 7:00 PM on December 6, 2016