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: How does a Soap dispenser work

  1. Oct 6, 2012 #1
    1. The problem statement, all variables and given/known data
    My soap dispenser does not work, but when i block the pump end the soap comes out, can someone explain to me why?


    2. Relevant equations
    I am looking for a relevant equation to prove why it doesn't work


    3. The attempt at a solution
     
  2. jcsd
  3. Oct 6, 2012 #2

    CWatters

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Some types of valve need back pressure to seal properly. Perhaps that's the explanation?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook