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Confused with pressure in closed-box

  1. Jun 8, 2012 #1
    I'm confused when i consider about this picture in my head.

    ... imagine that there is a ''closed-box'' on the floor.
    And ball A is in this closed-box.
    Pressure acted on the box = Patm.

    I'm wondering, how much pressure act on ball A ?

    With my sense, i think it is Patm.
    ... but i can't explain! it's a closed-box, so air mass above the box should have no effect on the ball in box ?!
  2. jcsd
  3. Jun 8, 2012 #2

    Doc Al

    User Avatar

    Staff: Mentor

    If the box is rigid and sealed from the surrounding air, then the outside pressure shouldn't affect the ball inside.
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