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Ideal gas law, What stands for P

  1. Dec 2, 2012 #1
    the ideal gas law, PV=nRT, I have question about the parameter P.
    Does P stands for the pressure exert by the gas or the atmospheric pressure?

    Say helium gases are enclosed inside a balloon. Then it gives pressure, temperature, and volume data to use the gas law. Does the pressure refer to the pressure of helium or the atmospheric pressure?
  2. jcsd
  3. Dec 2, 2012 #2


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    It's the pressure of the gas.
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