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Homework Help: Pressure/volume question

  1. Dec 10, 2004 #1
    At depth of 20 m below the surface of the sea, where the temperature is 5.0ºC, a diver exhales an air bubble having a volume of 1 cm3.

    a. If the surface temperature of the sea is 22.0ºC, what is the volume of the air bubble just before it breaks the surface? (Start hint: pressure beneath the surface of a liquid is Psurface + ρgh)
    b. If a 250 mm steel welding rod is lowered from the surface to the diver working at the 20m depth, what is the change in length of the rod when it achieves thermal equilibrium?

    kind of having problem with how to approach part B, thanks
  2. jcsd
  3. Dec 10, 2004 #2

    Doc Al

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    Staff: Mentor

    Hint: What's the thermal expansion coefficient for steel?
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