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Homework Help: The action of pressure on a balloon

  1. Jan 14, 2010 #1
    See the image below. State 2 is the starting position, and State 1 results from when the chain is pulled down. Clearly, the volume of the balloon has increased from 2 to 1. I was struggling to understand the exact physics behind this. As p=k/v, the pulling of a chain down will increase volume, decreasing pressure within the container. This will result in a negative pressure within the container. How does this negative pressure result in the expansion of the balloon? I believe it is due to the elastic recoil forces balancing the negative pressure, however I do not understand this fully. Would it be possible for someone to explain this to me? I would really appreciate it.

    Thank you

    http://img262.imageshack.us/img262/5182/screenshot20100114at164.png [Broken]
    Last edited by a moderator: May 4, 2017
  2. jcsd
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