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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45 views

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 ...
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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 ...
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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 ...
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How does the soap bubble film expansion phenomenon gives us an idea that numerically surfface tension and surface energy are equal?

I have asked this question along with few others which eventually has been closed by now. I didn' quite understand how is surface energy calculated from the soap bubble system. I have learnt from a ...
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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 ...
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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 ...
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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....
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Explanation of formation of bubbles when gases reach the hydrostatic pressure in a lake

I am learning about the hydrostatic pressure in a lake, can someone please explain to me why when the gases reach saturation in a lake, there is a formation of bubbles?
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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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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 ...
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Book recommendation for hydrodynamics of bubbles, drops, and particles

I am wondering if someone could please recommend to me some references on the topic of hydrodynamics of bubbles, drops, and particles, preferably in the context of complex and bio fluids. I am ...
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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 ...
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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 ...
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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~~...
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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....
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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 ...
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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 ...
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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 ?
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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, ...
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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 ...
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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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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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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 ...
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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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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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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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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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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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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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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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137 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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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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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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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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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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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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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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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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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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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, ...