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Homework Help: Torricelli Barometer and atmospheric pressure

  1. Apr 17, 2012 #1
    1. The problem statement, all variables and given/known data
    I have a Torricelli barometer column filled with mercury.
    Situation 1: Temperature1 = 20° C. Height: 0,760 m. Outer pressure:1 atm.
    Situation 2: Temperature2 = 35° C. Height: 0,762 m.
    Coefficient of termic dilation in the interval (T1, T2): [itex]18,2
    *10^-5 (°C)^-1[/itex]

    Find outer pressure in Situation 2.

    2. The attempt at a solution
    I used a proportion: [itex]1 atm : 0,760 m = x atm : 0,762 m[/itex]. But my result is wrong.
    What would you do?
    Thank you so much
     
  2. jcsd
  3. Apr 17, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    hi bznm! :smile:

    how did you take account of the thermal expansion in your calculations?
     
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