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Absolute pressure at the bottom of a container

  1. Jan 4, 2014 #1
    1. The problem statement, all variables and given/known data

    A container is filled to a depth of 20.0 cm with water. On top of the water floats a 29.0-cm-thick layer of oil with specific gravity 0.800. What is the absolute pressure at the bottom of the container?
    (Answer in Pa)

    2. Relevant equations

    P= ρgh+ P(atmospheric)

    3. The attempt at a solution

    (800)(9.81)(29-20)+101.3x10^3= 171932

    Webassign says "Your response differs from the correct answer by more than 10%. Double check your calculations."

    Did I substitute something wrong?
  2. jcsd
  3. Jan 4, 2014 #2
    Hi kimlu...

    You have to calculate pressure at the bottom of the container ,not between the interface of water and oil .

    You also seem to have forgotton to convert 'cm' to 'm' .
    Last edited: Jan 4, 2014
  4. Jan 4, 2014 #3


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    Homework Helper
    Gold Member


    Why did you subtract the thickness of water from the thickness of oil?

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