# Questions tagged [surface-tension]

Surface tension occurs due to the tendency of liquid molecules to favor their own kind. Surface tension is important in fluid multiphase systems typically at small length and velocity

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### Pressure inside a bubble/drop of water due to surface tension

I was studying problems in capillary action in fluid mechanics and I have a fundamental doubt. Is the excess pressure inside a bubble/spherical fluid body caused by surface tension, the same all ...
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### Why rain drops are spherical while water droplets on a glass surface are flat?

Why are raindrops spherical when falling through the air, but lose their spherical shape when they are on a flat surface?
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### Question about Young-Laplace equation proof

I was studying a proof of the Young-Laplace equation, but I came across a dubt in the very begin. Here the initial part of the proof: Consider an interface separating two immiscible fluids that are ...
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### How to calculate pressure necessary to push air bubble out of capillary [closed]

An air bubble is kept by surface tension at the bottom of a capillary. The capillary is sealed at the bottom, where the air bubble sits. How to calculate the pressure necessary to push the air bubble ...
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### What would happen to a soap bubble if there were no surface tension?

Suppose you have a soap bubble. Now, suppose that the surface tension in the liquid film that surrounds the bubble disappears instantly. What would happen to the bubble? Also, is it possible to form a ...
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### Why does a bubble created in the body of a liquid pop when it rises to the surface?

Suppose you have a glass of water and you blow bubbles in the water using a straw. The bubbles pop when they rise to the surface of water. Why does this happen? Does the surface tension of water play ...
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### How do bubbles on water surface merge?

When we open a tap over a water surface, we get to see a lot of bubbles ("half merged in the water") coming out on the surface. Now what I saw was that two such nearby half bubbles merge to ...
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### How does a snake climb the wall?

Consider a snake climbing up the wall or ant climbing up the wall, which force is responsible for it? An obvious answer is frictional force but my question is that if there is a normal reaction ...
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### Why does curvature reduce the inward attractive force of molecules?

This question concerns the first 2 paragraphs of this text. I am struggling to visualize why molecules on the flat surface experience more net inward force than those on a curved surface. If we have 2 ...
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### Measuring the tension of a drumhead

I'm working on an experiment to see how the tension of a drumhead impacts the frequency of its sound, but I'm not sure as to how I could measure this. I found this forum thread from 2012, which ...
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### How are curved soap films stable?

How do curved soap films remain in equilibrium, if surface tension tries to pull them taut? What I understand: Surface tension acts tangentially on a surface. The potential is energy is proportional ...
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### Surface Tension On The Surfaces which are not exposed to Environment

In the picture Below, I was asked to Calculate the force due to surface tension on the left side of the water about an imaginary square ABCD by the right side of water. ($T$ = surface Tenson) One has ...
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### Can a soap film be expanded infinitely?

Consider a rectangular wire frame with a sliding wire of length l. When the frame is dipped in soap solution, a soap film is formed over it. Assume that there is no friction between the arms and the ...
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### In physics, when should one use and not use calculus?

Assume that a drop of liquid evaporates by decrease in its surface energy, so that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? The surface ...
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### Why does surface tension increase on addition of soluble impurities?

I read that addition of soluble impurities increase the surface tension of water. I initially thought it was because when soluble impurities dissolve in water it leads to the dissociation of that ...
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### Why do hot water droplets persist in cooler water?

I notice this phenomenon typically when mixing hot or warm water with cold water. Basically, tiny droplets of hot water travel inside the body of cooler water and persist. I have included a photo of ...
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### Liquid Vapour Surface Tension Interaction with Solid

In my book there's an experiment to calculate the value of surface tension in which a solid of certain weight is kept on the surface of a liquid and it remains in equilibrium . Now the book states ...
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### Could a fish swim out of a sphere of water in a zero-gravity environment?

Can a fish swim out of a sphere of water in a zero-gravity environment? I am going to state some assumptions. We assume the sphere of water is not affected by any thermal properties of its zero-...
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### Marangoni effect and surface tension gradients in binary liquid

I have a question regarding the understanding of the Marangoni effect. A simple visualization is the deposition of a drop of soap (some surfactant-laden solution) into pure water. Because the soap ...
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### Same needle shows Hydrophobic and hydrophilic behaviour just by changing orientation or position (from surface to bulk)

If I penetrate water's surface with needle (using hand) then Cohesive forces> Adhesive forces and water molecules climb up the needle (exactly like capillary action) and needle behaves ...
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### Why do dry lentils cluster around air bubbles?

When I pour dry lentils into a water bowl, I notice many of them form little clusters, with an air bubble in the center. Why does this happen? I'm guessing something about static electricity. But not ...
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### Droplet Breakup model solely for charged droplets in electric field?

At the moment I am trying to simulate charged droplets and their berakup in an homogeneous electrical field in vacuum. I am using a VoF-Method, but as the droplets get smaller and smaller I would need ...
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### Why does water come out of a bottle in waves?

So imagine you have a bottle of water or any type of liquid (like a bottle of milk that has just been opened)that is completely full or even three quarter of it is full,why does the water or milk come ...
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