Manometer Problem: 18 mm Hg Measurement

  • Thread starter Thread starter Speedking96
  • Start date Start date
  • Tags Tags
    Manometer
Click For Summary
The discussion revolves around calculating gas pressure using a closed-end manometer, where mercury levels indicate an 18 mm difference. It is debated whether atmospheric pressure should be considered, with some participants asserting it is irrelevant for closed-end manometers. The confusion arises from the interpretation of the height difference, as one participant suggests it might be a misunderstanding of the manometer type, proposing it could be "open-ended." The correct approach involves recognizing that the height difference directly reflects the gas pressure, and atmospheric pressure is not factored in. Ultimately, clarity on the manometer type and pressure measurement principles is essential for accurate calculations.
Speedking96
Messages
104
Reaction score
0

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.
 
Physics news on Phys.org
I concur with you. Probably a simple mistake, should be "open-ended."
 

Similar threads

Chemistry What is "gauge pressure" and how does a manometer work?
  • · Replies 1 ·
Replies
1
Views
2K
Measuring the water volume in a small tank with a manometer
  • · Replies 26 ·
Replies
26
Views
2K
Confused about the volume of a rigid (glass) container
  • · Replies 2 ·
Replies
2
Views
2K
Pressure of Inert Gas in kN/m^2: 167.82 | Well-Type Manometer
  • · Replies 8 ·
Replies
8
Views
3K
Manometer Diagram with Barometric Pressure?
  • · Replies 1 ·
Replies
1
Views
16K
Calculating Mercury Column Height in J-Shaped Tube: Manometry Homework Solution
  • · Replies 7 ·
Replies
7
Views
2K
Engineering Thermodynamics: Determine pressure in the tank of a manometer
  • · Replies 2 ·
Replies
2
Views
1K
What is the absolute pressure in a tank measured by a manometer?
  • · Replies 1 ·
Replies
1
Views
2K
A manometer measures mechanical or thermodynamic pressure?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Question about a u-tube manometer with different diameters
  • · Replies 8 ·
Replies
8
Views
5K