Manometer Problem: 18 mm Hg Measurement

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SUMMARY

The discussion centers on the measurement of gas pressure using a closed-end manometer, where the mercury level is 18 mm higher on the sample side compared to the other side. The atmospheric pressure is stated as 99.7 kPa, but participants clarify that for closed-end manometers, only the height difference is relevant for pressure calculations. The correct interpretation indicates that the gas pressure is equivalent to the height difference in mmHg, which is 18 mm, leading to a gas pressure of 18 mmHg or approximately 2.4 kPa when converted.

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  • Understanding of closed-end manometer principles
  • Knowledge of pressure measurement units (mmHg and kPa)
  • Familiarity with basic gas laws
  • Ability to perform unit conversions
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This discussion is beneficial for students in physics or chemistry, educators teaching gas laws, and anyone involved in laboratory measurements of gas pressures.

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Homework Statement



A closed-end manometer is used to measure the pressure of a sample of a given gas. The level of mercury (Hg) is 18 mm higher in the part of the tube connected to the sample than in the other part. Determine the gas pressure in kilo-pascals, if the atmospheric pressure is 99.7 kPa.


Homework Equations



For a closed-end manometer, it is my understanding, and perhaps I am wrong, that the atmospheric pressure does not matter. Rather, you would only measure the difference in height (closed - sample) and that would be the pressure in mmHg.

So, I don't understand how the sample side could be 18 mm higher.
 
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I concur with you. Probably a simple mistake, should be "open-ended."
 

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