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Homework Help: Surface tension

  1. Sep 4, 2007 #1
    i am doing a physics assignment on the realationship between surface tension and temperature. i have calculated the surface tension at various temperatures using a capillary tube and measuring the height. i was given the formula:
    surface tension=(densityxradius of tubeheight of columnxgravity)/ 2
    i have calculated the surface tension, however, im not sure what units it is in. density was measured in g/mm^2, radius and height were measured in mm, gravity was measured in mm/s. im not sure if the answer will be dyns/cm or ergs/cm^2? or even something else? thankyou
  2. jcsd
  3. Sep 4, 2007 #2
    First of all convert all the mm reading to cm. Also measure the density in gms per cm^2 and g as cm/s^2. Now you will get in dynes/cm.
  4. Sep 4, 2007 #3
    surface tension=force*length.

    Hence surface tension=[tex]ML^2T^{-2}[/tex]
  5. Sep 4, 2007 #4
    I think that you have made some mistake. Surface tension is force/length.It is torque which is force*length(radius). So surface tension would be ML^0T^-2
  6. Sep 6, 2007 #5
    thanyou both so much. lets hope a get an A on my assignment! thanks again
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