Pressure on a sample of fluid (at rest)

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    Fluid Pressure Rest
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Discussion Overview

The discussion revolves around the concept of pressure in a fluid at rest, particularly focusing on how pressure is transmitted in a fluid system and the implications of Pascal's law. Participants explore the relationship between the pressure at different points in a fluid, the role of atmospheric pressure, and the influence of surrounding molecules on pressure measurements.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants question whether the pressure on a fluid sample includes contributions from lateral particles, leading to confusion about pressure equality between different samples.
  • There is a discussion about whether the pressure exerted by the horizontal pipe section above a sample is atmospheric pressure, with differing views on this point.
  • Some participants assert that as depth increases in a fluid, the pressure also increases due to the weight of the fluid column above, suggesting a direct relationship between weight and pressure.
  • Participants debate the concept of pressure transmission in fluids, with some asserting that pressure is transmitted horizontally due to isotropic properties, while others seek clarification on how this applies to different samples.
  • There is a request for a molecular explanation of how the weight of molecules above one sample can affect the pressure on another sample, indicating a desire for deeper understanding of the underlying mechanisms.
  • Some participants express confusion about the representation of pressure transmission in diagrams, questioning the accuracy of visual aids used in the discussion.

Areas of Agreement / Disagreement

Participants do not reach a consensus on several key points, particularly regarding the influence of surrounding molecules on pressure measurements and the interpretation of pressure transmission. Multiple competing views remain, and the discussion is characterized by ongoing questions and clarifications.

Contextual Notes

Participants express uncertainty regarding the definitions and implications of pressure in fluid systems, particularly in relation to atmospheric pressure and the role of lateral forces. There are also unresolved questions about the accuracy of visual representations used in the discussion.

  • #31
Kaushik said:
It must be equal so that it doesn't flow.

Then for that cubical part to not flow the pressure on top surface must be equal to that of the pressure on the side surface. Hence, pressure on both the cubical part is equal. Is it?
Yes, that is it. That is how you arrive at Pascal's principle.
 
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