# 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).

201 questions
Filter by
Sorted by
Tagged with
19 views

### 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 ...
• 17
1 vote
53 views

### 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 ...
• 11
1 vote
58 views

### 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 ...
41 views

### 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 ...
121 views

### 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 ...
• 8,220
1 vote
44 views

### 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 ...
108 views

### 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 ...
• 1,410
42 views

### 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 ...
2k views

### 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 ...
104 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), ...
1 vote
83 views

### 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 ...
1 vote
102 views

### 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 ...
• 2,270
1 vote
24 views

### 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 ...
• 11
753 views

### 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 ...
1 vote
124 views

### 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?
• 489
1 vote
53 views

### 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 ...
67 views

### 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 ...
1 vote
358 views

### 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 ...
• 2,042
88 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 ...
• 1,695
1 vote
141 views

### 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 ...
51 views

### 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 ...
67 views

### 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 ...
110 views

### 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?
462 views

### 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- ...
• 39
1 vote
32 views

### 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, ...
• 111
308 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 ...
• 284
63 views

### 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 ...
• 205
98 views

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....
875 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 ...
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 ...
• 12.5k
40 views

### 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 ?
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, ...
• 195