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I want to know the explanation of this problem

  1. Mar 4, 2015 #1
    1. The problem statement, all variables and given/known data
    By How much does the pressure in a cylinderical jet of water 4mm in diameter exceed the pressure of the surrounding atmosphere if the surface tension of water is 0.0718 N/M?

    2. Relevant equations


    3. The attempt at a solution
    ΔP= σ/r=0.0718/2*10^-3 , This is the answer I have but I don't understand from where did he get this law . Isn't it supposed to be ΔP= 2σ/r instead ?
     
  2. jcsd
  3. Mar 4, 2015 #2
    On what basis do you feel it should be ΔP= 2σ/r?

    Chet
     
  4. Mar 4, 2015 #3
    Sorry I was wrong , I understand it now
     
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