Does Manometer Tubing Diameter Affect P=pgh Calculation?

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SUMMARY

The internal diameter of manometer tubing does not affect the pressure calculation P=pgh, as pressure is defined as force per unit area and remains constant regardless of the tubing diameter. In the discussion, it was clarified that while a larger diameter tube holds more fluid, the height (h) of the fluid column remains the same for a given pressure. The key distinction made was between pressure and force, emphasizing that pressure is independent of the area of the tubing.

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Hi All,

When reading Manometers, does the internal diameter of the manometer have a bearing on the readings & the calculation P=pgh??
There is no inclusion of the ID of the manometer tubing.

If we apply pressure to a manometer tube say of 2mm inside diameter the height will be X but now we use a 20mm inside diameter tube, the volume is more of course so do we get the same h value with the larger diameter. The mass of the fluid is more so for the same pressure it would seem the h value will be different?

Thanks
 
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You'll notice that pressure is in units of area, which means that it is independent of the area of the object it is acting on. You may be confusing pressure with force. Force is pressure times area.
 


Thanks Russ,
Good explanation!
 

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