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Surface Tension?

  1. Jun 9, 2005 #1

    Just a quick question:

    How do you meausre surface tension of a liquid? WHat meathods are used and how do the units reflect the data.


    Derek Mohammed
  2. jcsd
  3. Jun 9, 2005 #2


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    You might have a look at the following site:
    http://www.kruss.info/techniques/methods_overview_e.html#Wilhelmy_Plattenmethode [Broken]

    Here is some further comments on the Du Nuoy ring method and Wuilhelmy plate method:
    http://www.ksvinc.com/sigma703.htm [Broken]

    Essentially it seems, each of these methods relies on relating the force needed to detach a simple geometric object from the liquid surface to the surface tension.
    Last edited by a moderator: May 2, 2017
  4. Jun 9, 2005 #3
    What do the units stand for? mN/m??? Newton metres/ Metres??

  5. Jun 10, 2005 #4
    mN=10^-3N and the denominator is in metres
  6. Jun 10, 2005 #5


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    Presumably you could measure the velocity and wavelength of the "ripples" in a liquid to measure its surface tension, since it provides the restoring force for some waves on the surface. I'm sure there are other ways, though.
  7. Jun 10, 2005 #6
    Numerically Surface Tension (T):

    [itex]T= \frac{F}{l}[/itex]

    Infact, if you consider a unit length line on the surface of the water and measure the force on it from water on one side will give you Surface Tension. But thats not the 'experimental
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