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Guidance on finding the pressure and density of nitrogen

  1. Jan 14, 2010 #1
    1. The problem statement, all variables and given/known data

    Calculate the pressure and density of nitrogen at which there is a 15% error in the ideal gas equation of state for a plane flying in air of temperature 250 K

    2. Relevant equations

    P = rho RT
    Pv = RT

    3. The attempt at a solution

    Little confused on how to approach the problem. Any guidance is appreciated.
     
  2. jcsd
  3. Jan 15, 2010 #2
    i would suggest that since air is made up of about 78% nitrogen, you could substitute the nitrogen with air. anyway, there is already a 15% error in the equation. the error due to the substitution of nitrogen by air should not be very significant.

    i might as well be wrong!
     
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