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

Effect of temperature on capillary rise

  1. May 5, 2012 #1
    We all think that by increasing the temp of a liquid, the surface tension would reduce and so capillary rise will not be as high. But on increasing the temp, the liquid's density also decreases and so the weight of liquid to be lifted also reduces. Which will have the dominating effect, decrease in the weight of liquid leading to an increase in capillary height or a decrease in the surface tension causing a fall in the capillary height????
  2. jcsd
  3. May 6, 2012 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    It will depend on the liquid and the temperatures involved. E.g. water gets denser from 0C to 4C.
  4. May 7, 2012 #3

    Andy Resnick

    User Avatar
    Science Advisor
    Education Advisor

    Presumably you are referring to equilibrium, as opposed to say, thermocapillary flow (Marangoni effect). AFAIK, the interfacial energy is a monotonically decreasing function of temperature (since it goes to zero at the liquid-gas phase transition), but the temperature dependence of the contact angle is less clear- at least, I couldn't easily find any useful data.

    Since we are discussing equilibrium, the usual formula applies and the variation of height will go as δ(σ/ρ), where σ is the interfacial energy and ρ the density (assuming the contact angle remains constant).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook