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Determine the pressure of a gas in a manometer?

  1. Jan 14, 2005 #1
    How does one use various liquids and their unique densities to determine the pressure of a gas in a manometer?
  2. jcsd
  3. Jan 14, 2005 #2


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    Staff: Mentor

    Pretty simple: [weight] density times height.
  4. Jan 15, 2005 #3
    Thank you.
  5. Jan 21, 2005 #4

    on traditional manometer, i.e U-shaped tube, the height difference between the left and the right column is the "h"

    To calculate the "manometric" pressure use this formula
    Pressure = density of the liquid * gravity constant * the height difference "h"

    To obtain the absolute pressure simply add this manometric pressure to the atmospheric pressure (i.e. on standard condition : 1 atm, 760 mmHg, 101.3 kPa)

    Hope it helps
  6. Jan 21, 2005 #5
    Yes it does greatly. Thanks! :smile:
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