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Pressure Measurement Problem

  1. Apr 11, 2005 #1
    Blaise Pascal duplicated Torricelli's barometer using a red Bordeaux win, of density 984 kg/m^3, as the working liquid. What was the height of the wine column for normal atmospheric pressure? Would you expect the vacuum above the column to be as good as for mercury?
     
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  3. Apr 11, 2005 #2

    dextercioby

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    The first question is trivial.Use Pascal's formula.

    Daniel.
     
  4. Apr 11, 2005 #3
    So that is P=Po+(row)(g)(h)
    P=1.013*10^5+(984kg/m^3)(9.8)(h).....is this correct?
     
  5. Apr 11, 2005 #4

    dextercioby

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    No.It should be vacuum on top of the wine...

    Daniel.
     
  6. Apr 11, 2005 #5
    I don't understand what you are saying.
     
  7. Apr 11, 2005 #6

    dextercioby

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    I'm saying that the experiment should be the same as in the case of Torricelli,but the length of the tube be >14 times bigger.

    Daniel.
     
  8. Apr 11, 2005 #7

    Gokul43201

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    What is P in this equation ?
     
  9. Apr 11, 2005 #8
    P is suppose to be the pressure, but im not sure what that is...I don't get this problem at all.
     
  10. Apr 11, 2005 #9

    Gokul43201

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    There is no other P involved.

    On one side of the column, you have atmospheric pressure (Po). On the other side, you have vacuum (P=0). So, the force due to the liquid column must balance the force due to the atmosphere.
     
  11. Apr 11, 2005 #10
    So is the answer -10.5?
     
  12. Apr 11, 2005 #11

    dextercioby

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    It should be a plus.But yeah,it's good.

    Daniel.
     
  13. Apr 11, 2005 #12
    Is it good for mercury?
     
  14. Apr 11, 2005 #13

    dextercioby

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    What?That #?Nope,it's computed for wine.

    Daniel.
     
  15. Apr 11, 2005 #14
    thanks for your help buddy...
     
  16. Apr 11, 2005 #15

    Gokul43201

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    Remember, you used the density of wine, not the density of mercury.
     
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