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Balloon up or down?

  1. Oct 16, 2007 #1
    ambient air with 15 degree C and atm pressure of 1.013E5 N/m^2. Balloon is filled with ambient air before it was lifted up to 500 m by a helicopter where the pressure is 950 hPa, what will the balloon's internal temperature and its internal mass density?

    I try to use PV = MRT and I found that I have two variables and one equation.

    I can obtain M/V from P/RT at the surface. However, I found it's hard to get temperature and density from the given data. Thanks for any input...

    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
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