High School Need Help Regarding a U Shaped tube problem

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    Pressure Tube
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SUMMARY

The discussion centers on the pressure differences in a U-shaped tube containing two fluids: oil and water. It is established that the pressure at point A is less than at point B due to the differing heights of the fluid columns, despite both points being on the same horizontal plane. The relevant formula for pressure change with height is identified as ##\rho gh##, where ρ represents fluid density, g is the acceleration due to gravity, and h is the height of the fluid column. The conclusion emphasizes that the pressure difference arises from the different densities of the fluids and their respective heights in the tubes.

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AmirWG
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my text box says that the pressure at point A is less than pressure at point B
Are not they supposed to have same pressure as they are on the same horizontal plane ?
 

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AmirWG said:
View attachment 239550
my text box says that the pressure at point A is less than pressure at point B
Are not they supposed to have same pressure as they are on the same horizontal plane ?
How does pressure change with height? Do you have a formula handy? One involving the fluid density, the acceleration of gravity and the height of a section of fluid, perhaps?
 
AmirWG said:
Are not they supposed to have same pressure as they are on the same horizontal plane ?

Assuming the tubes are open to the atmosphere, the pressure at the top of each tube equals the pressure of the atmosphere. But note that the tops of the tubes are not at the same level? Evidently the two fluids in the tubes have different densities!
 
Last edited:
jbriggs444 said:
How does pressure change with height? Do you have a formula handy? One involving the fluid density, the acceleration of gravity and the height of a section of fluid, perhaps?
the only thing given is that the fluid in yellow is oil while the one in blue is water.
 
Mister T said:
Assuming the tubes are open to the atmosphere, the pressure at the top of each tube equals the pressure of the atmosphere. But note that the tops of the tubes are not at the same level? Evidently the two fluids in the tubes have different densities!
so the pressure at point A is less than pressure at point B because the height at point B is greater than the height at point A ? right ?
 
AmirWG said:
so the pressure at point A is less than pressure at point B because the height at point B is greater than the height at point A ? right ?
No. Points A and B are at the same height. Are you familiar with the expression ##\rho gh##?
 

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