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Air Bubble

  1. Aug 6, 2005 #1
    A spherical air bubble originating from a scuba diver at a depth of 18 m has a
    diameter of 1 cm. What will the bubble's diameter be when it reaches the
    surface? (Assume constant temp)
    a. 0.7 cm b. 1 cm c. 1.4 cm d. 1.7 cm

    I know this problem shouldn't be all that difficult, but I'm not sure how to convert the depth into pressure. I would think they would say whether or not the water was sea water, so I was wondering if there was another way to figure this out other than through using density. Maybe I am over analyzing and that part was simply left out, but I just wanted to be sure. Thanks again help.
  2. jcsd
  3. Aug 6, 2005 #2
    yes i beleive you are making it harder than it really is.

    hydrostatic pressure is defined by

    p = density * height of liquid

    try this and see if it helps
  4. Aug 6, 2005 #3
    Thanks for the help. I ended up using p = po + density*g*h and got the answer I was looking for.
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