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

Why is the pressure of two different liquids in a manometer the same?

  1. Oct 26, 2008 #1
    I just finished a question in which a u-shaped tube (manometer) is filled with water to a certain height. Another substance, in this instance, oil, is added to one side of the manometer. I was asked to find the height of the new substance. I used the formula P(water) = P(oil), or
    (ϱwater)gh = (ϱoil)gh. So, I know how to solve it, but I don't really understand it. Why is the pressure of both substances the same? Thanks for your replies.
     
  2. jcsd
  3. Oct 26, 2008 #2

    russ_watters

    User Avatar

    Staff: Mentor

    Think about what happens at the bottom of the U-tube. What happens if the pressure on one side is greater than the pressure on the other at the bottom?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Why is the pressure of two different liquids in a manometer the same?
Loading...