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Homework Help: Absolute pressure question

  1. Apr 28, 2010 #1

    An air bubble originating froman under water
    diver has a radius of 5 mm at some depth h.
    When the bubble reaches the surface of the
    water, it has a radius of 7.4 mm.
    Assuming the temperature of the air in the
    bubble remains constant, determine the abso-
    lute pressure at this depth h. The acceleration
    of gravity is 9.8 m/s2 .
    Answer in units of Pa.

    2. Relevant equations
    what I need to know. Is this a PV=nRT question??

    3. The attempt at a solution

    I dont need to know the answer to the question, just what equation to use to find the absolute pressure. there is a follow up question to determine the depth of the diver as well.
  2. jcsd
  3. Apr 28, 2010 #2
    I simplified it to P1V1=P2V2 and solved for P1 and got the answer. Anyone know how to find the depth of the diver given all these variables?
  4. Apr 28, 2010 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Hi J0hnnyD, welcome to PF. Do you know how to find the hydrostatic pressure at a certain depth in a fluid?
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