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).

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18 views

Air bubble of any shape in a viscid liquid

I am wondering about the existence of a function\action that would move the box so that the air bubble would take a given shape. Consider a subset of spaces $\Omega\subset \mathbb{R}^3$ maybe for a ...
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Gas currents within bubble injected into liquid in open container

All at room temperature. Inject gas bubbles into the bottom of an open container of liquid. Gas bubbles rise in the denser, heavier liquid. As the gas bubble is being formed within the water, surface ...
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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 ...
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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 ...
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1answer
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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 ...
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22 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 no regain their colour....
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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 ...
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33 views

Coalescence of soap bubbles and its impact on the resulting volume

Suppose I have two spherical soap bubbles of volumes $V_1$ and $V_2$. Suppose, they are found to coalesce under isothermal conditions to form another bubble. Is the volume of this resulting bubble the ...
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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?
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What are Skyrmion bubbles?

what exactly is the difference between a skyrmion and a skyrmion bubble? Thanks.
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1answer
18 views

Distance / Energy of particle when popping bubble

Hi when I am putting the Dishwashing liquid on the sponge it sometimes makes such small bubble like 5mm in the diameter that pops afterwards and I always wonder if it is possible that the particles of ...
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How to keep a air bubble bottom of a water glass?

Suppose we have a glass of water. if we make a air bubble bottom of the glass using a straw that will quickly come to the surface because of the pressure ,density difference and the gravity . Assume ...
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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 ...
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28 views

Removing steam bubble formation during heating up water [closed]

Suppose I would like to heat up a quantity of water (at maximum 60 degrees) using a hot aluminium plate similar to a bowl. I observed that bubbles appear on the bottom aluminium surface. Is there ...
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How is energy stored in the surface of a bubble?

In the book of Prigogine, Modern Thermodynamics, it is given on page 147 that Another example is the natural evolution of the shape of a bubble enclosed in a box of fixed $V$ and $T$. In the ...
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42 views

Bubbles in pressure waves

I found an article in which they say this, at the end they say that there is a net flux of gas into the bubble, but I don't understand why, since there is a dilatational phase (in which the bubbles ...
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26 views

Formation of bubbles in a fluid

I'm reading an article (The fluid mechanics of bubbly drinks by Roberto Zenit), I have a question about it (the part of which is added as a picture) In the article they say that the gas cavity will ...
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Effective viscosity in bubbly liquid

Motivation: I have screwed some crepes big time this morning and it made me think... Consider a bubbly liquid (such as a crepes batter if you whisk it too much). Is there an approximate measure of ...
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What kind of propulsion would a Scrubbing Bubble use [closed]

The brand name bathroom cleaner Scrubbing Bubbles has a mascot, that is a bubble with a rotating bush on the bottom. Please view this video to see an example of the motion. I would like to know what ...
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1answer
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Help with obtaining the derivation of the resonance frequency of a bubble [closed]

I have a question with regards to the derivation of the resonance frequency of a bubble described using the bubble dynamics equation in the paper I'm currently reading (Eqn 1): $$\frac{3}{2}R_t^2+RR_{...
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1answer
88 views

What causes this phenomenon when boiling water?

A few days ago, when boiling potatoes I only cut each of them in half (leaving a flat face in each half). When the water started bubbling a little (and also later when it was boiling) the flat face of ...
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51 views

A question about Laplace law

In Laplace law, the force on a soap bubble from inside is $F = P.πr^2$ and what I understand that the leaning forces acting on the inside of the sphere are resolved into two components the vertical ...
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2answers
53 views

Questions about Vapor Pressure and Cavitation Bubble

I am currently learning about cavitation in my fluid mechanics study. I am confused about the definition of Vapor Pressure, does it exist only in the saturation line? I am also confused about how can ...
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1answer
135 views

Why do gas bubbles stick to the surface of the bottle?

When a bottle is left out in summer for sometime gas bubbles are formed on its walls and they remain there unless they are disturbed. But why does it happen so? I mean the water is exerting buoyant ...
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Observed that under-water bubbles are very resilient: what causes this?

Noticed that bubbles could simply not be burst while underwater -- a bubble that was underwater with part of the surface touching the wall of the tub if pressed upon with a finger would simply move -- ...
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2answers
186 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 ...
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1answer
133 views

What happens during cavitation?

Cavitation is vapor bubbles and when they implode creates a shock wave, before imploding the bubble can reach temperatures of 10000k. I want to know what conditions must be met to make cavitation, ...
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60 views

Time taken by bubble to come to surface

Does air bubble take same time to emerge from shallow water and deep water? I think the acceleration due to buoyancy will be the cause.
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116 views

Why Air bubble are always sphere in shape? [duplicate]

Everyone of us had noticed air bubbles once in his life. They are Sphere in shape. But I want to know why the are sphere in shape, instead of any other shape.
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69 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?
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What kind of forces develop on a solid shape suspended in bubbly fluid? Is there a name for the study of this sort of interaction?

Let's say I have a solid shape - a sphere, a cylinder, I don't know if it matters - and I place that solid in a container of water. The forces on the shape consist of gravity and buoyancy (due to ...
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32 views

Does a thickness of a bubble become constant over time?

Assuming no gravity, imagine you have a bubble floating in the air, does its thickness have a tendency to become constant? State a bit differently, if we start with a bubble with variable thickness, ...
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1answer
60 views

Bubble optics, impact

My 8 years old daughter was blowing soap bubbles. Most of the bubbles had color. She randomly choses a bubble with colors and lands it on the wand. Instantly it's color is gone. If she blows this ...
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1answer
36 views

Bubbles in a Pipeline 2

This question has kind of been asked before here, but aren't the gas bubbles in the pipeline also a moving fluid and so as they get constricted shouldn't their pressure decrease too. If so how are ...
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154 views

Optics of thick soap bubbles

There was some discussion in a previous thread ( Why are thin soap bubbles colorless? ) that talked about thin soap bubbles. My question is, what if we go the opposite way? Why are thick bubbles ...
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1answer
210 views

Why do soap bubbles seem to resist merging?

When playing with soap bubbles in a bathtub, it seems impossible to bring two bubbles together to form a single larger bubble. When two floating bubbles meet, a wall is formed between them. Even when ...
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70 views

Why are there less bubbles the second time I pour soda in the cup?

I poured some Pepsi into a mug, and it foamed, and I poured until the foam was at the top of the glass. I waited a few seconds for the bubbles to go, and the liquid level was revealed to be at around ...
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1answer
150 views

Why does soap solution forms bubble but tap water does not? [duplicate]

The surface tension of water reduces on addition of soap to it. Then why does normal water not form bubbles but soap does even with less surface tension?
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2answers
190 views

Why does air get trapped below water pouring into a glass?

The drinking-water-tap at my workplace has a low pressure continuous stream of water. When I pour water into a glass which has at least about (depth) 5cm of water in it, surprisingly large air bubbles ...
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What is the equation of state of foam, on a macroscopic scale?

Consider a large amount of soap foam (or any other substance producing foam), of mass density $\rho$ in a gravityless environment. What is the internal pressure $p$ of that foam, viewed as a fluid on ...
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81 views

Water vapor pressure in oxygen bubble

Suppose we have a source of O$_2$ bubble formation in water at specific nucleation sites, how can we estimate the water vapor pressure inside the O$_2$ bubbles? I know that: (1): $p_\mathrm{O_2}+p_\...
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1answer
412 views

Surface tension and entropy

I think of surface tension as work/area, just as pressure is work/volume. I understand it to measure energy rather than free energy. I should think that a molecule on the surface of a liquid would ...
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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?
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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 ...
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How long does it take for oil to coalesce in water?

I was studying the process of coalescence in emulsions. We considered $N$ bubbles of liquid 1 floating in liquid 2. The result we derived, is that if there are some dissipative forces (diffusion) the ...
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1answer
69 views

What keeps small mobile bubbles at the bottom of a kettle from rising

We have a glass jug water kettle with a flat heat plate as the bottom. It boils water quite vigorously in 2-6 minutes depending on how full with a 1000+W element. Just today I noticed that very ...
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1answer
974 views

Pressure inside a bubble

Consider a bubble with radius $r$, inner pressure $P_v$, and outer pressure $P_{\infty}$. When we choose our control volume (blue dotted line in figure) to encompass half the bubble, we have a surface ...
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2answers
1k views

Why are the “bubbles” at the edges of my soup so large?

At lunch today, I was eating chicken noodle soup. After finishing most of it, I turned my attention to a sandwich and let the soup sit for about five to ten minutes. When I looked back, I noticed that ...
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109 views

Champagne bubbles and gravity

One of the influences on bubble size is the speed with which a bubble rises in a glass - this, I believe, is due to the force of gravity which acts on the liquid around the CO2. The greater the ...
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Why do bubble rings stop rising near the surface, and then spontaneously dissipate?

When I've blown bubble rings in my pool I've noticed that every single time a ring rises to the surface it stops rising about 1-2 centimeters from the surface, stopping in place. Then, it ...