1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook