Questions tagged [bubbles]

A coherent region of fluid embedded in a fluid with different properties (air in water) or a coherent region of fluid surrounded by a membrane embedded in a fluid which may or may not be different (such as air in a soap membrane).

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Why are water bubbles created at the top of the bottle if the water level is higher?

Water bubbles created at the top of the bottle if the water level is higher: but water bubbles is not created at the top of the bottle if the water level is lower: This question is very different ...
Cameron Melvin's user avatar
6 votes
1 answer
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How does a bubble pop?

I was looking at some old slow motion videos showing a phenomenon where a bubble is popped by firing a sphere (or pea) through it. One obvious thing that happens is that the pea does not pop the ...
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Inverting a bubble interface to recover the level set function

I have access to some high quality CFD data that includes 2D and 3D level set functions for simulations of bubbles. Masking the level set function using a heaviside is easy and it is a fast way to get ...
Logan's user avatar
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4 votes
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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 ...
magneticMono_Poal247's user avatar
2 votes
1 answer
101 views

What are Bubbling Geometries?

I know that Wilson loops in certain higher rank representations are dual to Bubbling Geometries. Also, certain local operators are dual to this kind of solutions. But (independently from holography), ...
ConfusedPhDstudent's user avatar
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Potential energy of a gas lighter than air

Here is the situation. Let's say I have have a mass of a given liquid and I heat it to create a gas. The gas has a lower density than air, so it will move higher and higer in the atmosphere. Then, I ...
benjamichon's user avatar
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How are bubbles formed when a raindrop hits a flat pool of water?

I have noticed that raindrop impact can create a bubble on the surface of the water in a hot tub (104°F) up to several centimeters in diameter that is stable for several seconds before bursting. The ...
Stevan V. Saban's user avatar
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Electron as a wave function, is it a wave bubble? [closed]

Something I have been pondering. We tend to think of a physical particle as a grain of sand or at atomic levels maybe an electron(lepton). If I now choose to consider an electron as a wave, typically ...
RayH's user avatar
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In beer, why do bubbles travel faster upwards in the center?

This is a very odd question, but I just so happened to be observing a pint of beer and realized that the bubbles floating up seemed to travel faster towards the center of the glass than towards the ...
Corey Mitchell's user avatar
1 vote
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Can real particles be created from a false vacuum spontaneously through decay?

Consider false vacuum decay. Given the energy difference between the false to true, Can this process lead to the creation of real particles as well as the vacuum bubbles?
VVM's user avatar
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Why does light always make a rainbow on the surface of a bubble?

When light is refracted through little drops of water the rainbow is formed behind the water molecules. When light is refracted through a glass prism the rainbow is formed inside the prism. Then why ...
Snack Exchange's user avatar
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Bubble phenomenon

A few days ago I encountered a problem that caught my attention: The surface of an air bubble oscillates at a frequency of $20$ kHZ. We observe that this oscillation causes another air bubble nearby ...
Natsu dragnir's user avatar
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2 answers
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Bubbles formed in standing water in glass

I kept a cold standing water in a glass for a while to warm it up. After a while I returned to see that small minute bubbles have formed in the glass. On closer inspection, the bubbles seem to not ...
Kshitij Kumar's user avatar
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1 answer
86 views

Why is this the "no bubbles" condition?

I'm reading through the "Waves" textbook from the Berkley series. In section 7.3, water waves are described. First, the condition that water is incompressible is derived as follows (assuming ...
agaminon's user avatar
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Calculating the pressure inside catenoid formed using soap film?

Soap film will not readily form a cylinder, instead, it will form a catenoid if it's circular faces are flat. I know that this happens to minimise surface area. But how to prove that this provides the ...
Agrim Tripathi's user avatar
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Necking stage in bubble detachment

The first image is the bubble dynamics in nucleate boiling, in a) you can see that the bubble is detaching by minimizing contact line with surface until zero, while in b) the bubble is enlongate and ...
Nhat Nguyen's user avatar
5 votes
1 answer
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What is the explanation for the structure of foam?

When you look at any gas in liquid foam, you'll see a particular structure. You'll find that the structure consists of some bigger bubbles along with some smaller and smaller ones. I would like to ...
Debarshi Das's user avatar
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Surface tension in a bubble

In a bubble or liquid droplet how is tangential surface tension force assumed to be balanced by perpendicular pressure force?
Daniel 's user avatar
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Why does bubble formation only happens at the point when vapor pressure becomes equal to atmospheric pressure during boiling?

I am a high school student and I am very confused about what's actually happening at the microscopic scale in an ideal solution when it's boiling? Boiling as I understand at microscopic level is- ...
Shyam's user avatar
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What would happen if a true vacuum expanded within the event horizon of a black hole? [duplicate]

If a bubble of a false vacuum decaying to a true vacuum state (in one of the fields described by the Standard Model) somehow expanded starting from a point within the event horizon of a black hole, ...
Ray Hamel's user avatar
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4 votes
2 answers
284 views

Why doesn't a frothing drink overflow the glass?

When you pour an aerated (fizzy) drink such as lemonade or beer into a glass, the froth rises above the liquid level, but usually stops rising when it reaches the rim of the glass, even though you ...
Weather Vane's user avatar
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Why does the force on bubble on a flow differ from that of a sphere in a flow?

Background: A tiny sphere of radius $a$ in a slow moving laminar fluid flow with viscosity $\mu$ is acted on by a force given by the well known Stokes equation: $$F_s = 6 \pi \mu a U,$$ where $U$ is ...
kevinkayaks's user avatar
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Which forces keep two soap bubbles together?

I am trying to calculate how many soap bubbles can hang together against the force of gravity, but I am not sure what forces hold them together. My guess is the surface tension, so an equation like $F=...
Pooplover800's user avatar
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2 answers
103 views

Hydrogen in soap bubble

I read somewhere that if hydrogen gas is passed through soap solution bubbles containing hydrogen are formed. My question is how these bubbles are stable! Hydrogen has much less density and mass than ...
Chayan's user avatar
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Why bubbles are not moving up in a kettle full of water?

When I boil water in the kettle, many tiny bobbles appear after a short time, long before boiling (See video here). They don't seem to come from the bottom of the kettle, like in boiling, but from ...
Ilya Gazman's user avatar
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Does bubble in the buble chamber represented the actural measurement of the particle or the trajectory of the potential?

The bauble chamber was used as a measurement in the particle physics. Traditionally, the thoughts were that when the particle made an excitation in the chamber, as to physically measured, a bubble was ...
ShoutOutAndCalculate's user avatar
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1 answer
587 views

How do you mathematically describe the quantum bubble?

The vacuum is filled with quantum bubbles. In a Feynman diagram this would correspond to a closed one particle propagator line, a circle, or a bubble. I'm curious how this is described mathematically. ...
MatterGauge's user avatar
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1 answer
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Dimensional analysis of soap bubble formation

I was wondering how the radius of a soap bubble depends on the way it is formed and tried to come up with a simple argument using dimensional analysis. I am not sure if that argument if correct, or ...
leapsheep's user avatar
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Two questions about Sonoluminescence in water: Does it produce Cherenkov radiation? Could be done with a laser beam instead of sound?

Two questions about Sonoluminescence in water: Does Sonoluminescence in water produce Cherenkov radiation when the bubble is collapsing? Could be made the same collapsing bubbles but instead of using ...
Joako's user avatar
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4 votes
0 answers
477 views

If vacuum decay was somehow triggered inside a black hole, would the rest of the universe notice?

If vacuum decay is triggered, it will spread (at maximum) at the speed of light. But the spacetime inside a black hole is causally disconnected from the space outside. Nothing that happens inside the ...
zucculent's user avatar
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2 votes
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Since the pressure in smaller bubble decreases why does its radius decreases and not increase, as it should, in the "communicating bubble" experiment?

If we blow two soap bubbles from two communicating pipes with funnels at the ends (see the fig) and close the tube to which they are connected, air will flow from the smaller bubble to the larger ...
Osmium's user avatar
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4 answers
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Why do the bubbles in a champagne accelerate?

The bubbles in champagne are familiar to most people. They form almost exclusively at the specific points in the champagne glass, and from these they rise faster and faster. Why do the bubbles in ...
Aniruddh Sharma's user avatar
0 votes
1 answer
52 views

Theoretical reason behind surface formed when blowing bubbles

For a surface with boundary as a curve in $\mathbb{R^2}$ , the surface formed when blowing bubbles may looked like a sphere with a disc of area removed. I know that the surface tension forces on the ...
tryst with freedom's user avatar
2 votes
0 answers
45 views

From where do the bubbles come from in an aerated tap? [duplicate]

It is common knowledge that when the opening of a tap has many holes, the water flows out as a stream of bubbles. But if you open the tap slowly, the water flow is laminar without any bubbles at first....
AlphaLife's user avatar
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2 votes
1 answer
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Excess pressure of soap bubble in different medium

I have been wondering that why excess pressure of soap bubble remains $${4S}/{R}$$ Even if it is in water or in air?
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1 answer
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Can a bubble of vacuum move through space?

If there are really regions in space where a vacuum exists, I have learned there can still exist electric and magnetic fields within. That makes this region then differentiable from the regions around ...
user298427's user avatar
0 votes
2 answers
49 views

Non-popping bubbles

I used a compressed air can to clean my laptop's keyboard and speakers. After that procedure I noticed there're small bubbles in the holes of the speakers. I've tried to pop them with a thin brush and ...
goedwig's user avatar
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2 votes
1 answer
279 views

What caused the air bubbles on the bottle wall to move downwards?

Recently, I found an interesting phenomenon. I observe that there are some air bubbles formed on my bottle wall, as shown in the image. Then, I tilt the water bottle gently such that the water level ...
Abl grp's user avatar
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1 vote
1 answer
223 views

What is this equation of volumes and pressures of the soap bubble?

Initially the uncharged soap bubble exists with the radius $r$ and the surface tension $T$ Nextly the bubble has been held the potential $V$at the surface of it and the radius of the bubble became $R~~...
electrical apprentice's user avatar
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0 answers
32 views

Could gravitational waves have their origin in collision of true and false vacuum?

Could the gravitational waves the consequence of the collision between a true vacuum bubble and a false vacuum bubble, at the beginning of the universe? (as they try to explain there: https://www....
Mathieu Krisztian's user avatar
0 votes
2 answers
792 views

What is a bubble from nothing?

Recently I was reading a collection of lectures on Swampland Conjecture and came across an interesting subtitle about a bubble from nothing. A bubble from nothing is a non-perturbative instability ...
Arman Armenpress's user avatar
23 votes
5 answers
6k views

How does rubbing soap on wet skin produce foam, and does it really enhance cleaning?

We tend to rub soap after applying it to the skin. I found it interesting that the mere act of sliding our hands on the wet skin surface produces millions of air bubbles in the liquid, that later ...
AlphaLife's user avatar
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0 votes
1 answer
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How the bubble size in a champagne bottle evolve?

How the bubble size in a champagne bottle evolve ? Is it fixed or is evolving with time ?
Mathieu Krisztian's user avatar
3 votes
2 answers
1k views

How do bubbles rise in water?

As a concrete example, consider boiling water. As water boils, bubbles form which rise to the surface. I know that things rise because of the Archimedes principle, however as far as I understand it, ...
red whisker's user avatar
33 votes
4 answers
6k views

Do bubbles get created when you move something in water?

I've seen in a lot of movies and animations of bubbles forming when something moves underwater (e.g., fish swimming). Is it theoretically possible (under any temperature, pressure circumstance ...
alienare 4422's user avatar
1 vote
1 answer
145 views

Is it possible to make Soap bubbles last forever?

For a conventional soap bubble which burst very easily, mostly due to water evaporates or run into things that corrupt the surface tension. Would it be feasible to make a machine that keeps humidity ...
yupbank's user avatar
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0 answers
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Bubble Detachment Dynamics

How does a gas bubble detach from a wall (say, for example, bubbles which form when water in a vessel is heated) it was sticking to? I have an idea... It is that when we increase the internal pressure ...
user266637's user avatar
2 votes
1 answer
281 views

Bubbles on the surface of tea after using a teabag

What are those bubbles/lines on the surface of my (clean) teacup after making tea with a tea bag (seethrough paper kind, wrapped in paper)? I used a kettle. The water is clean. Also what determines ...
Nick The Dick's user avatar
1 vote
1 answer
212 views

Why do bubbles lose their shimmer when touched by the wand?

I was playing with bubbles and noticed that bubbles that shimmer due to thin film interference tend to lose their colour when touched by a wand. When once again released they do not regain their ...
trinitrotoluene's user avatar
1 vote
0 answers
94 views

Soap bubble with air blown in and charge distributed [closed]

So, I was trying to do this question and here is my attempt: I first tried work out the surface tension forces like so: I did $ F= PA$ $ P = 4 \frac{\gamma}{r}$ by laplace law so, $ F = 16\gamma \pi ...
tryst with freedom's user avatar