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Capillary action at different temperatures

  1. Nov 16, 2015 #1
    Hi guys,

    I'm doing a project at the moment revolving around capillary action and surface tension. Today I conducted an experiment to observe capillary action in a capillary tube and paper towel at different temperatures of water. I don't understand why I've got the following results:

    As you can see, they are complete opposites of eachother. This seems to make sense according to my calculations with Washburns and Jurins equations. But I can't figure out the physics behind this. The capillary tube radius is 0.2mm. The paper towel was 1.5x23cm with 5cm submerged in water for a time of 120 seconds.

    I also did an experiment investigating the relation between surface tension and soapy water. I tried different concentrations of soap solution and added them dropwise onto the top of a circular metal disk very carefully until failure occured. Any ideas why my graph seems to level out after while?:


    here is a picture of what I mean by failure (excuse my crappy camera)
    non failure:


    any help appreciated
  2. jcsd
  3. Nov 21, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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