Questions tagged [bubble]

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).

Filter by
Sorted by
Tagged with
198
votes
3answers
49k views

Surviving under water in air bubble

An incredible news story today is about a man who survived for two days at the bottom of the sea (~30 m deep) in a capsized boat, in an air bubble that formed in a corner of the boat. He was ...
46
votes
8answers
6k views

Explaining to a five year old - why don't bubbles run like water

My five-year old daughter was asking about astronauts the other day and why they float in space. After me showing her a few bits on the kids section on the NASA web site I started explaining about the ...
33
votes
4answers
4k 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 ...
33
votes
2answers
2k views

Frost bubble formation

I woke up recently to find the following structures on my lawn; they resemble bubbles, but are formed from ice (we had a moderate frost overnight). There were eight of these 'bubbles' on my lawn and ...
32
votes
5answers
1k views

Are bubbles in ice at a lower or higher pressure than atmospheric pressure?

When water phase-transitions into ice it expands. The water usually contains dissolved air. Freezing forces the air out of the solution into bubbles. Are these bubbles at a lower or higher pressure ...
29
votes
4answers
2k views

How long would a bubble made in the ISS last?

It seems to me that if on Earth soap bubbles pop, it is because the gravity makes the water and soap go to the bottom of it. When there is not enough water at the top of the bubble, it pops. But ...
22
votes
4answers
5k views

Why do bubbles make a sound?

I have an understanding of how bubbles work. They encapsulate air (or other fluids) in a membrane caused by surface tension. When they pop, there is often a sound. Sound is a type of energy, kinetic ...
19
votes
1answer
568 views

What are the equations of motion of a hole in a soap bubble?

Imagine the following situation: I have a thin stationary water film, like a soap bubble, suspended inside a large ring. I throw a small loop of string onto the film and punch a hole inside it. How ...
18
votes
4answers
2k views

Why are we able to see air bubbles under water?

Title is self explanatory. I'm assuming both water and air are transparent. So, if they are true, how can I clearly distinguish an air bubble under water?
14
votes
3answers
2k views

Would a perfectly clean and perfectly smooth champagne glass have no bubbles?

My understanding is that nucleation sites for bubbles in a champagne glass are either due to defects in the glass or due to fibers in the glass (see this article for details on that statement). Does ...
13
votes
5answers
3k views

What is the real cause of the boiling (forming of bubbles) of water?

I've got a question about the boiling of water. I'm a first year physics student and from the Netherlands. I've searched alot about the boiling of water and this confused me. Everyone said something ...
13
votes
4answers
3k views

Why are coke bottles that much fizzier if you shake them?

We've all been there: you drop your bottle of soda at some point and when you try to open it, it bursts into foam. My question is, then: why does shaking a carbonated drink make the dissolved gas ...
13
votes
1answer
32k views

Why does water sometimes form bubbles when I pour it into a glass?

Sometimes when I'm filling up a container with water from the tap, bubbles will form on the top of the water. They look a little like soap sud bubbles, but there's no soap suds present. I notice, ...
12
votes
1answer
2k views

Why do soap bubbles rise?

If I have a soap bubble then it will move rather randomly upwards perhaps due to the initial force from me blowing it, and eventually take ground moving downwards. Another answer to a similar ...
11
votes
4answers
14k views

What is the physics behind a soap bubble?

A soap bubble is an extremely thin film of soapy water enclosing air that forms a hollow sphere with an iridescent surface. What fluid dynamical process occurs during the popping of a soap bubble?
10
votes
2answers
2k views

Why do bubbles initially stick to the side or the bottom of a glass while boiling?

When boiling water, I've noticed that bubbles will appear to grow at the bottom of the glass for a period of time and then rise. I've read that bubbles form from nucleation centers but I don't know ...
10
votes
2answers
194 views

Why does foam in a rotating liquid accumulate near the centre?

I first noticed this while having a coffee. When the coffee was rotating in the cup, most of its foam accumulated near the centre. I recreated the effect with some soap and water. The accumulated foam ...
10
votes
2answers
2k views

Why will two bubbles floating on water surface attract each other?

Two identical bubbles floating on water surface will form clumps, according to the "cheerio effect". But what's the detail about the force? It's necessary to calculate the shape of water surface, in ...
10
votes
5answers
6k views

Is it possible to trap smoke or a smoke like gas inside a glass bubble?

I am a glassblower, and I would like to trap smoke in a glass bubble, my hope is to create an infinitely lingering smoke inside. Is this possible?
10
votes
1answer
30k views

Why is light produced when an underwater bubble is collapsed with a sound wave?

Why is light produced when an underwater bubble is collapsed with a sound wave? I have come across this fact on a page (similar to this) but can't understand "Why". I'm just curious about this ...
9
votes
1answer
3k views

Why do bubble wands have ridges?

The bubble wands supplied with children's bubble mixtures seem to fairly universally have a set of ridges around the hole used to create bubbles - for example, see the circle in the upper right of ...
8
votes
2answers
7k views

Surface tension and soap bubbles

In a common experiment, you can make a paper clip float on water due to the strong surface tension. Adding just a tiny bit of soap immediately destroys the surface tension and lets the paper clip sink....
8
votes
2answers
780 views

Why does the gas cloud of an underwater gunshot pulse?

I have been watching some slow motion video and I was intrigued by the slow motion underwater gunshot. The first moments of the video go as expected. The gun fires and a cloud forms in front of the ...
7
votes
4answers
2k views

Can water pressure ever be high enough to trap gas bubbles or keep them from surfacing?

Can water pressure ever become high enough to trap gas bubbles and/or keep them from surfacing?
7
votes
2answers
8k views

How do we calculate the speed of an air bubble rising in water?

We all know that an gas bubble expands as it rises through a liquid due to decreasing pressure.But at what speed does it rise? if we make a bubble of unit volume filled with a gas of given density at ...
6
votes
1answer
462 views

Is nuclear fusion via underwater vacuum possible?

An under water explosion creates a bubble which quickly collapses on itself. The action takes less that 1/100 of a second for bubbles less than a foot across. This creates a point of extremely ...
6
votes
3answers
995 views

What can be the simplest way to find the thickness of a soap bubble?

Is it possible to measure the thickness of a soap bubble without using any sophisticated instruments such that anyone can do it?
6
votes
2answers
256 views

What causes the milk to suddenly rise up & spill out if not stopped?

Well, when milk is heated in a container its temperature starts rising & water vapor bubbles rise up through it. This initially causes a little and slowly rise in level of milk. But after certain ...
6
votes
1answer
619 views

Why are thin soap bubbles colorless?

I read here that: The colors of a bubble are dependent on the thickness of the film. A bubble becomes thinner and thinner as it dries out (due to evaporation), before finally popping. As the ...
6
votes
2answers
2k views

Solving the Young-Laplace equation for arbitrary axisymmetric geometry

Say I have a non-ellipsoidal soap bubble and I want to numerically analyse the pressure in the inner lobe of this bubble here: The Young Laplace equation gives the pressure difference across a fluid ...
6
votes
1answer
71 views

Movement of bubbles in a cup of tea

Why is it that when I try to scoop bubbles out from the surface of a cup of tea, they always slip off the spoon even if some of the tea does not?
6
votes
2answers
149 views

What is the physical process when you uncork a bottle in a shoe hitting a wall?

When you want to uncork for example a champagne bottle you can put it in shoe and hitting the bottom of the shoe against a wall. By this the liquid is pushing out the cork. But is this process just a ...
6
votes
1answer
2k views

Why do air bubbles stick to the side of plastic tubing?

I'm watching water with air bubbles flow through transparent plastic tubing. The inner diameter is a few mm. Bubbles typically are the same diameter as the tubing, with length about the same or up ...
5
votes
4answers
5k views

What is the difference between pressure in water droplet and that in an air bubble?

The question is at least supposed to be simple but yeah, I need some detailed answers. I have tried thinking about it in the lines of surface tension but it seems what is required of me is more than ...
5
votes
1answer
1k views

Why does not a bubble in a thick hand sanitiser not rise?

Here is a picture of a bubble trapped inside a thick hand sanitiser. These bubbles never rise despite not sticking to the walls! They just remain stationary, in the middle of the liquid, despite the ...
5
votes
1answer
4k views

Which balloon has the higher pressure and why?

I know that when two soap bubbles of different radii are connected by a tube then air will flow from the smaller bubble to the bigger bubble. This happens because the pressure inside the smaller ...
5
votes
1answer
278 views

Distribution of bubble radius in carbonated water (soda, coke)?

After opening a cold sprite into a cup (operation under room temperature), numerous bubbles of various sizes are visible. What is the distribution of the size of these bubbles by radius? It is ...
5
votes
1answer
90 views

What is causing the repeated creation and destruction of bubbles in boiling starchy water?

A while ago I was cooking rice, and I noticed a recurring pattern of creation and destruction of bubbles. It seemed like the bubble-layer would increase in height, until it 'popped', and the layer ...
4
votes
3answers
3k views

Why does a bubble take a spherical shape?

I suspect this has something to do with thermodynamics and the isoperimetric inequality and I'm interested in a mathematical derivation of this result.
4
votes
1answer
606 views

Why is there bubble in the boiling water?

Whenever we boil water there, there comes bubble from the bottom surface of the kettle when the water reaches 100 degree Celsius. Why is that? We also see some bubble sticking to the surface even ...
4
votes
3answers
926 views

Soap bubbles in laser light

I have experienced an interesting phenomenon this weekend. It involved : Soap bubbles which were ... ... flying around while laser light was drawing images around the walls All this accompanied by ...
4
votes
1answer
637 views

Why soap bubbles are made of soap?

Why are soap bubbles made of soap? What I know is to have stability in bubble, waterproofing agents should me mixed, but soaps are water wetting agents, and water wetting agents will decrease angle ...
4
votes
2answers
3k views

How to move a bubble which is trapped by the capillary pressure?

I have a question about how to move a trapped bubble in a tube. If we assume to have a horizontal tube, with water on each side of the bubble. The point to the left of the bubble is point 1, while ...
4
votes
1answer
5k views

Ways to create controlled small bubbles in water within plastic tubing

What is a practical way in an engineering or physics laboratory to create bubbles of a specified size in water within plastic tubing? The tubing is a few mm inner diameter. We'd like to make bubbles ...
4
votes
2answers
340 views

Is it possible to create a soap bubble in space?

since space does not contain air, is it possible to create a soap bubble without air in space or in vacuum and can can you explain why so? OR will there be any possibilities for a bubble in such kind ...
4
votes
2answers
487 views

Why do turkey bacon slices form bubbles in the same places?

Often, turkey bacon forms large bubbles when cooking. It's simply a fact of how it cooks. More interestingly however, I was making turkey bacon this morning when I noticed that all of the slices ...
4
votes
1answer
2k views

Bubble in a pipeline

I am just thinking about this phenomenon: We have a horizontal pipeline with a flowing liquid, which contains a small bubble of gas. How do the dimensions of this bubble change when it reaches a ...
4
votes
2answers
276 views

What determines the lifetime of a soap bubble?

I'm wondering why soap bubbles only last some seconds in average. There is almost no wind in the closed environment I create the bubbles in. Regardless of whether they adhere to a surface (e.g. the ...
4
votes
0answers
62 views

Is it true that the bubbles do not touch each other in the boiling water while going up?

I heard once that the bubbles do not touch when the water is boiling. I want to know if that is actually happening, and I would be interested to hear why it is true or not.
3
votes
3answers
806 views

Can a soap bubble bounce off a laser?

Clip; I presume some momentum transfer's at play, but can't put a full picture together. What's going on - why does the laser 'repel' the bubble? ... or is it fake?