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Air pressure in cylinder?

  1. Apr 2, 2009 #1
    1. The problem statement, all variables and given/known data
    in a cylinder there is 30g of air which starts with a volume of 3L and pressure 0.1MPa. What will be the density of the air when the piston of the cylinder compresses the air to 0.5MPa ?


    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 2, 2009 #2

    fluidistic

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    Where are you stuck?
    PV=nRT, density=mass/volume.
     
  4. Apr 2, 2009 #3
    I don't know where to start
     
  5. Apr 2, 2009 #4

    fluidistic

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    I'm not really sure, but if we suppose the temperature don't change then the problem is easy.
    You are told that the pressure increases by a factor 5. So what can you say about the volume?
    Use the formulas I gave you. (are you familiar with them?)
     
  6. Apr 2, 2009 #5
    yes the temperature stays constant. the volume will decrease so the density will increase? I'm not sure how to use the formulas what does each variable stand for?
     
  7. Apr 2, 2009 #6

    fluidistic

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