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Homework Help: Problem involving mercury thermometer

  1. Dec 4, 2011 #1
    1. The problem statement, all variables and given/known data
    A mercury thermometer contains 7.5 mL of mercury. If the tube of the thermometer has a cross-sectional area of 1.2 mm2, what should the spacing between the °C marks be? (The volume expansion coefficient for mercury is 1.81 x 10-4 °C−1.)

    2. Relevant equations

    3. The attempt at a solution
    I set ΔT = 1, converted the mL into mm3.

    I got ΔV = [5.43*(10-4)](7500)(1) = 4.0725 mm3.
    However, I don't know what to do with the area!
  2. jcsd
  3. Dec 5, 2011 #2
    What do you get if multiply the cross sectional area by the change in height?
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