1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Max radius of falling liquid drop

  1. Sep 23, 2008 #1
    The max radius a fallling liquid drop can have without breaking apart is given by the equation:

    R=√(σ/gρ) where the rho is density of liquid (1000kg/m^3), and the surface tension is
    .7275J/m^2. g is gravity

    I am asked to determine the max radius of a drop in units of cm at 20 degrees celcius. Is this problem just a plug the values in problem and ignore the temperature? Is the temperature there just to throw me off?
  2. jcsd
  3. Sep 23, 2008 #2


    User Avatar
    Homework Helper

    The density σ does have a temperature dependence, but if the σ is a given with no reference to temperature in the problem, I'd have to wonder if the real problem is having you convert units correctly.

    (Btw σ of water at 20 degrees is 0.9982071.)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook