Bubbles Definition and 107 Threads

Hi, I am trying to do some experiments with cavitation bubbles by generating a spark under water however I am having some trouble and was wondering if anyone would be able to help or offer some advice. The problem I am having is I cannot generate the spark consistently. I place the electrodes...

The solution manual says that before water enters the hollow So here an air bubble of radius R will escape from the sphere. The excess of pressure inside the bubble is 2T/R. The excess of pressure prevents the penetration of water into the sphere. Water begins to penetrate when the excess of...

Question is simple, as we all know water boils at the bottom surface and it forms tiny bubbles. These bubbles grow up and rise in the water until they detach. What is the acceleration of these bubbles compared to gravitational acceleration? - Is it constant velocity? - Is it approximately...

Bubbles of air were rising in some water in a rice field. The bubbles would float around at random for a while. If two bubbles got within a certain distance of one another they would very quickly merge. It looked like a predatory larger bubble pouncing on the smaller prey. Gotcha! Why is...

I am interested in the potential for air bubbles in a plastic structure to expand with heat, and put pressure on the plastic surrounding the air bubble. In this case the plastic structure is formed by melting a thermoplastic powder. In between the grains of powder are voids with air in them. As...

When bubbles are not removed from a buret before a titration, the measured volume of titrant used is more than the actual volume used. Then the analyte concentration will be greater than the actual concentration, and the mass of the analyte will be greater as well. Instead, it will actually...

Is a high viscosity fluid(liquid), filled with air bubbles, more or less vicious than without air? Please provide the scientific principle behind that

Hi, What can be done to avoid trupped bubble air at the top of a pressure vessel without upper hole during hydraulic testing? Also, once the bubble exist what can be done to release it? Thanks

Suppose you just poured a glass of champagne, then you drop the glass straight down (so that there is no tilting). Do the bubbles: (1) Continue to rise with respect to the glass. (2) Remain in place with respect to the glass. (3) Sink with respect to the glass.My intuition is telling me that...

Hi All, I need some help to figure out how to best go about setting-up and analyzing a micro-fluidics design problem I ran across in my research. It's not the typical single-surface contact angle adhesion kind of analysis. Basically, I have a wide micro-fluidic channel that's formed by a...

I have observed the following phenomenon: Step 1: Dunk the pipette into the solution. Step 2: Press it and hold it pressed. Step 3: Pull out the pipette, until the lower end is in the air. Step 4: Release the pressure. Now one would expect that the solution in the pipette sucks bubbles of air...

Hello All: i remember (and saw ) that the SARS-ncov-2 layers have hydrophobic and hydrophilic properties few weeks ago i was reading about forth flotation and it is a method to separate metals , but on low temperature could we use it to separate the spike protein and mix it with immune cells...

I understand why bubbles come from the same spot (nucleation sites) -- not the issue. My issue is WHY does THIS happen? I open a bottle of carbonated water, pour a bit and then close the top. Why does the trail of bubbles oscillate sinusoidally, on the way up? (Now, here is the problem: I do...

I noticed whilst watching the tiny bubbles rising up in a glass of tonic that if they are close enough to each other they come together and coalesce. I tried to note the distance and my best guess was that at 8 times the bubble diameter the bubble attracts others. Sometimes they get attracted...

I confess that I am unable to understand the technical presentation in this article. I am hoping that someone at PF will be able to respond with a simplified summary about what this article is describing. Quote from Abstract The Galactic Centre contains a supermassive black hole with a mass of...

Last night PBS showed two shows on Black Holes. In the shows the host traveled on a supposed warp drive spaceship. A question occurred to me. Suppose for the argument that the Alcubierre drive were possible. Then suppose you were in a ship contained in a warp bubble moving through space at say...

Please could someone give me some idea of what is happening when you pull back on a syringe filled with fluid and the bubbles in the fluid (in the syring) expand? Let's assume it's water. How do the bubbles grow? I am assuming it is a rectified diffusion process where gas in the fluid is drawn...

What I am confused about is why do bubbles of air in water move up. I understand why solids and liquids would move up in water if they are less dense. I get the idea that the deeper you go in water the more pressure there is because of the more water weighing down on the water and so there would...

There was the dot.com bubble, the housing bubble etc where lots of people became really rich. Seems there is potentially a bitcoin bubble going on currently. So I suppose in my lifetime, there will be more of these opportunities to cash in on.

What will be the area of common surface of two identical bubbles of radius R , i know there common surface will be flat as the radius of curvature of comman surface will tends to Infinity , but how do i relate with area of flat surface I tried to use Energy = Surface tension * area And then...

I’ve understood that within the theory of Eternal Inflation the Bubble Universes that form from a drop of “vacuum” energy expand at the Speed of Light. My question is: Why would expansion be at the speed of light and not at a speed proportional to the level of vacuum energy still present in...

Why do bubbles coalesce? I imagine it has to do with surface tension and pressure. The Young-Laplace equation states a bubbles pressure is inversely proportional to its radii. Higher pressure implies higher potential energy, so maybe bubbles coalesce to form a bigger bubble with bigger radii...

Hi all, Not sure it's the right place to ask but I found these while walking on the beach, they seemed to have come from the sea. They "explode" if you walk on them. Any ideas what this could be? https://ibb.co/fuL0gF https://ibb.co/ikrUaa https://ibb.co/hj3LgF Thanks, Audry

Hi, I am trying to create a device that would "simply" make a bubble under the water. What I am aiming for is production of small bubble but continuously and under the water. When I say continuously, it doeant have to be for extended periods of time, could be just for ~2 hours but the longer...

Homework Statement [/B] The question is from chapter 9 of "Exercises in Introductory Physics" by Leighton and Vogt. The answer given in the book is ##R = 4.9 \times 10^{-5} \rm{cm}##. Homework Equations $$\sigma = \frac{\Delta P \cdot R}{4}$$ Where, ##\sigma## is the surface tension...

this is pretty cool ( pun intended) Dave

Bats in my garden do not seem to notice soap bubbles. Do soap bubbles reflect sound?

To get bubbles out of plastic resin that's to be used in casting, the uncured resin can be put in a vacuum chamber. However, I notice that a pressure chamber is also advocated for getting out bubbles (e.g. http://www.smooth-on.com/faq_display.php?faq_id=81 ). Are bubbles in a plastic resin...

Hi everyone, Got a question I'm trying to solve here. It is for an experiment I'm running at achool. I got a pipe system with a centrifugal pump. There is cavitation in front of the pump due to the pressure falling below the water Vapor pressure. When the water flow enters to the...

Hi, Im doing a Invesitgation of bubbles traveling through liquids. I am blowing bubbles of fixed volume up different viscous liquids. I seem to have got a anomaly but I can't explain it When recording one of the repeats in the foam bath I saw that the bubble rushed up the liquid. It took 1.4...

Hello all- First post. I am curious if it is possible to create cavitation underwater with these specific criteria. I am basically using a venturi device that will be pulled underwater in saltwater. Is it possible to get the vapor pressure down low enough to boil water (make bubbles). I have...

There have been some stories in the news lately about using focused ultrasound and collapsing bubbles to open the blood-brain barrier and deliver drugs to treat a brain tumour. e.g. here I was actually involved in the early stages of this project, working on theory and simulations. I wrote a...

The apparatus consisted of a one gallon air tight clear plastic jug one quarter filled with ferrous chloride (uh, Fe(II)Cl ?), water and sufficient hydrochloric acid to complete the transformation. The remaining space was filled with oxygen at atmospheric pressure. When triggered a mechanism...

klotza submitted a new PF Insights post Explosion-Generated Collapsing Vacuum Bubbles Reach 20,000 Kelvin Continue reading the Original PF Insights Post.

I hope this isn't too simple for this site. I have had a challenge at work trying to eliminate air bubbles from a paste in a 20oz cartridge. The cartridge has a piston in one end to push the material out and the other end tapers to a small threaded 3/8" opening. I won't take the time explain...

A soap bubble or a nuclear detonation emit a sound created by the sudden release of pressured air? Am I correct? How is the sound of a knock on the door, two billiard balls hitting each other, etc. How is the sound generated in their cases? Thank you.

Hi all, I am really confused at how bubbles are removed in a chemical reaction. Generally it is removed by diffusion...But is there any quantitative equation for that like adhesion energy...? I want to go in this direction to quantitatively analyse the conditions that bubbles are attached or...

Anyone , what the bubble in the fluid will be if we compressed the fluid with high pressure? for example the fluid is oil with high viscous. does the bubble change in phase? (condense)

When I was in the Navy, we were told of the immense importance of maintaining pressure inside the reactor (all the reactors in the Navy use a hydrogen moderator via water). My teacher discussed that one of the results of loss of pressure could be the formation of steam bubbles collecting on the...

Hello, I apologize in advance if this is the wrong section, it seemed the most appropriate Dolphins are able to produce rings of air which seem to counteract buoyancy by rotating ( I'm assuming rotation ) https://www.youtube.com/watch?v=bT-fctr32pE How and why is this true ? Thanks

Recently I went to a pool, and observed that when we hit the water/ create waves on the top layer of it, bubbles emerge. It may sound like a silly question, but it really got stuck in my mind..Why does this happen? Thank you for your answers in advance. P.S: I am new to this forum, I...

I am doing an experiment in which I have to remove gas bubbles within a liquid medium. The liquid is contained within a small plastic mould of about 2cm diameter. The conditions of the experiment cannot be changed. My question is, can I practically remove the bubbles. I cannot stir the...

Homework Statement Two soap bubbles of radii 3cm and 2cm come in contact and sticks to each other. Calculate the radius of curvature of common surface. The Attempt at a Solution Excess pressure inside soap bubble = 4T/R Let the radius of common surface be R' \dfrac{4T}{R'} = \dfrac{4T}{r_1}...

Say I have two 5-dimensional bubbles moving towards one another in 5-dimensional space. When they touch, at the monent they touch, they meet at a 3-dimensional "point." As they join, the 4-dimensional hyperplane created their by common boundary immediately inflates from that point and expands...

I have been thinking to extract gases from SAP (the gel is super absorbent polymer(sodium polyacrylate)). The gases are trapped inside the gel in form of bubbles gas. I am thinking of using salt to turn it back to liquid or using vacuum pump to extract gas out. Using salt might be the best way...

Hello. When I was on a scientific event, some students show a experiment with a bubbles. They poured into the bottle baking soda and vinegar. Then they blowing bubbles directly into the bottle, where the bubbles levitated. Why they levitated? Can you express a chemical equation? Thank you...

Hi We have a problem at work where we need to store a metal container under water. The container is to have small holes in the lid to ensure that it floods when submerged but we must minimise the size of these holes. Intuitively, if you have more than one hole in the lid then water will enter...

Just curious, When my mom was boiling water i saw that the rate of bubbles coming out of water was increasing as time passed.But i want what is the rate of bubbles coming out is proportional to? And one thing i noticed is that when the gas is shut off the bubbles stop instantaneously.Why is it?

Hey I heard somewhere that bubbles underwater that are collapsed by sound waves produce light, to me this in no way makes sense can anyone explain is it like swamp gas that the fabled UFOs are

How is it that bubbles form on the bottom of a surface of a pot of boiling water? I think that there is probably an elementary answer to this from chemistry. But I am thinking of something more along the lines of kinetics. I think that perhaps there is enough energy on the bottom surface of...