Bubbles (physics)

Captive bubble method

The captive bubble method is a method for measuring contact angle between a liquid and a solid, by using drop shape analysis. In this method, a bubble of air is injected beneath a solid, the surface of which is located in the liquid, instead of placing a drop on the solid as in the case of the sessile drop technique. The method is particularly suitable for solids with high surface free energy on which liquids spread out. Hydrogels, such as soft contact lenses for example, are likewise inaccessible for the standard arrangement; the captive bubble method is also used in such cases. The captive bubble method is a scientific method for measuring the contact angle between a solid surface and liquid in a fluid. A contact angle is formed on a smooth, periodically heterogeneous solid surface. Above the solid surface, a liquid drop is submerged to the solid in a fluid. The measurement of contact angles usually contributes to the measurement of the surface energy of solids in the industry. Different from other methods of measuring the contact angle, such as the sessile drop method, the system utilized in the captive bubble method has the fluid bubble attached from below to the solid surface, in which both the liquid bubble and the solid interact with a fluid. (Wikipedia).

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Hydraulic cylinder with fixed piston

Green cylinder with machine table reciprocates. Pressure fluid is conducted into cylinder via holes on fixed piston rod. The hoses can be stationary. In case using holes on the cylinder the hoses have to move with the cylinder. The arrows show flows of pressure fluid.

From playlist Mechanisms

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How to Make a Vacuum Pump

This video will show how to make a vacuum pump, a device that can be used to suck the air out of sealed environments. This is the same pump I use to operate my vacuum cannon seen here: http://youtu.be/CVL99yIB3NQ A clear vacuum chamber such as the one seen in the video can be obtained by

From playlist Practical Projects & Skills

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Steam Vacuum - Making/How it Works

A steam vacuum is a vacuum that's create by making steam in a container (I use a microwave and a kettle) and then rapidly cooling it back to water (condensing it), leaving behind a vacuum. This vacuum is a low pressure are that dramatically sucks in more water and, if in a flexible contain

From playlist Science Projects

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Gravity Filtration and Vacuum Filtration

The first laboratory technique that we will learn together is a very simple one, filtration. This is how we separate a mixture of liquids and solids. There are two common ways a chemist will perform filtration, those being gravity filtration and vacuum filtration. These are very easy to un

From playlist Chemistry Laboratory Techniques

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Now You Know: Bursting Balloons

When you stick a needle in a balloon, the rubber tears—the balloon pops. But high-speed video reveals the details, and there are some surprises to be had. How does the rubber unzip as it tears? It’s different for a round balloon and a longer balloon-animal balloon. And if the balloon is fi

From playlist Now You Know

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What Happens When You Put Bubble Solution In A Huge Vacuum Chamber?

In this video I put bubble solution in my vacuum chamber. I don't need to actually blow bubbles in the vacuum chamber because once it starts boiling it will make its own bubbles! Watch as the chamber fills with bubbles once I turn on the vacuum pump. The most amazing part is once it is fil

From playlist The Action Lab Vacuum Chamber Awesomeness!

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Why Marine Mammals Suck

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From playlist Biology

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flap turbine water test

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From playlist Turbines

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From playlist Black American History

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How to Make a Vacuum Cannon

To learn how I made the vacuum pump used to operate this cannon, take a look at this video: http://youtu.be/UkPLu6mgdWA A vacuum cannon is an interesting physics demonstration that shows how much atmospheric pressure there is at the earths surface, though we do not feel it because our bod

From playlist Science & Experiments

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Chinchillas! What, Where, and How

Jessi shares what Chinchillas are, where the come from, and how to care for them in captivity. Featuring Cheerio the chinchilla! Chinchilla Introduction Info: http://www.chinchillachronicles.com/introducing_chinchillas.html Our Video Sponsors: Barbara Lea Weaver-Mercado Robert K. Jer Ka

From playlist What, Where, and How

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The Expansion of the Sun

Lucie Green presents, The Expansion of the Sun, at Ignite Sci Foo 2011

From playlist Ignite Sci Foo 2011

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Slavery in the American Colonies: Crash Course Black American History #2

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From playlist Back to School - Expanded

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Preserving Lonesome George Short Doc

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From playlist Earth Day

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Experimental Methods: Flow visualization (Part 1) by Jaywant Arakeri

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From playlist Summer school and Discussion Meeting on Buoyancy-driven flows

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The Natives and the English - Crash Course US History #3

In which John Green teaches you about relations between the early English colonists and the Native people they encountered in the New World. In short, these relations were poor. As soon as they arrived, the English were in conflict with the native people. At Jamestown, Captain John Smith b

From playlist US History

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Air bubbles sink and steel spheres rise in an unusual fluid

Counterintuitive effect occurs in mixtures with both liquid and solid properties. Learn more: http://bit.ly/2gSTqfL

From playlist Materials and technology

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Bubbles | SciShow Tangents Podcast

Kids Month floats on as we talk about possibly our lightest subject ever: bubbles! Pop in to learn what makes a simple soapy membrane so fascinating to kid and adult like! Want more SciShow Tangents? Check out hundreds more episodes of our podcast here: https://scishow-tangents.simplecas

From playlist SciShow Tangents

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The Germantown Petition Against Slavery: Crash Course Black American History #5

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From playlist Black American History

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Progress on vacuum chamber build - helium leak detection, custom flanges

I machined a few custom aluminum adapters for KF/NW vacuum fittings on the lathe this weekend. Next time, I hope to have electrical feedthroughs and should be ready to start depositing material!

From playlist Mechanics

Related pages

Orders of magnitude (length) | Drop (liquid) | Metastability | Symmetry | Contact angle