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Pressure and Volume relationship

  1. Jul 6, 2011 #1

    Pressure and Volume are inversely proportional to each other
    When you decrease the volume, the pressure increases.
    However, when you increase the pressure, it seems to me that the gas molecules want to spread out more and the volume would increase, but boyle's law says that it should decrease because they are inversely related.
    What is wrong in my thinking?
  2. jcsd
  3. Jul 6, 2011 #2


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    Science Advisor
    2017 Award

    Boyle's law applies only under conditions where the amount of gas molecules and the temperature of the gas remain constant.

    So, let's say you have a balloon full of gas. How would you increase the pressure in that balloon without adding gas molecules or changing the pressure?
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