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Finding pressure in a diving bell

  1. Mar 15, 2009 #1
    1. The problem statement, all variables and given/known data
    At the surface, where the temperature is 27 °C, the volume of air in Dan’s diving bell is 2 metres cubed. When he descends to a depth of 10 m the pressure doubles and the temperature drops to 7 °C. What volume of air does Dan have in his diving bell now?

    2. Relevant equations
    P1 x V1/T1 = P2 x V2/T2

    3. The attempt at a solution
    P1= ? P2= ?
    V1= 2 metres cubed V2= ?
    T1= 27 °C (300 Kelvin) T2= 7 °C (280 Kelvin)


    Im having trouble finding out P1 and therefore I can't find out P2 and V2!
    Please help me.
    Thanks
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 15, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    You don't need the actual pressure, just the fact that it doubles. Express P2 in terms of P1.

    (Although: What's the pressure at the surface of the water?)
     
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