Forces acting on body placed in meniscus

  • Context: Undergrad 
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    Body Forces Meniscus
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Discussion Overview

The discussion revolves around the forces acting on a body placed on the surface of water in a capillary tube, focusing on the differences between concave and convex menisci. Participants explore how these forces may vary with changes in the capillary diameter and external conditions such as pressure and temperature.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant describes the observation of concave and convex menisci in a capillary tube and questions the forces acting on a body placed on the water surface in both scenarios.
  • Another participant asserts that interfacial energy is not related to canthotaxis and suggests that the floating body does not consider the contact angle.
  • A participant inquires whether pressure or temperature can affect the meniscus of water.
  • Another question is raised about whether anything can change the meniscus.

Areas of Agreement / Disagreement

Participants express differing views on the factors influencing the meniscus and the forces acting on the body, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

There are unresolved questions regarding the dependence of meniscus behavior on various factors such as capillary diameter, pressure, and temperature, as well as the implications of interfacial energy and contact angles.

muldi
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I have a question regarding forces in meniscus.

Lets assume we have capillary 1cm in diameter. We pour some water into the capillary.
We will observe concave meniscus. If we add some water (so water level exceed the height of the capillary) we will observe convex meniscus.

Not let's assume we place a body (not heavy one) on the water surface in the center of the meniscus. What forces (strength and direction) will be acting on our body in both cases?

Which meniscus can hold heavier body on the water surface?

Will it change a lot with capillary diameter?

I hope my question is clear.
 
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interfacial energy is not related to canthotaxis; the 'floating' body knows nothing of the contact angle.
 
Does pressure or temperature change the meniscus of water?
 
Can anything change meniscus?
 

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