Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Surface Tension?

  1. Jun 9, 2005 #1
    Hi,

    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.

    Thanks

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

    arildno

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    Dearly Missed

    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??

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

    SpaceTiger

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    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
    method.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Surface Tension?
  1. Surface Tension (Replies: 3)

  2. Surface tension (Replies: 7)

  3. Surface tension (Replies: 26)

  4. Surface tension (Replies: 3)

Loading...