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11 results for "Surface Tension"

11 results for "Surface Tension"

Surface Tension

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Double Bubble [S | t+ | ★★★] Double your pleasure with this puzzler: small bubble blows up large one. [ In-Depth Description] Soap Film and String [S | t+ | —] A loop of string floating on a soap film is pulled into a perfect circle by surface tension...

Laplace's Law and Aneurysms

Presentation

What it shows:

Blow up a long cylindrical balloon and it inflates according to Laplace's law. Arteries, which also need to be flexible, are designed to fight against the kind of aneurysms seen in inflating rubber balloons.

balloon
balloon

How it works:

Laplace's law for...

The Surface Treatment of Glass

Presentation

What it shows:

The strength of a material in tension or compression will be affected by discontinuities in its surface structure. This can be demonstrated for glass using microscope slides, and the comparison of failure stress before and after the removal...

Double Bubble

Presentation

What it shows

When two different size soap bubbles are connected together, the smaller diameter bubble will shrink and collapse to blow up the larger diameter bubble. One can use this to demonstrate Laplace's law or the phenomenon of minimizing the...

Capillary Action

Presentation

What it shows:

capillary action
Due to surface tension effects water rises up a narrow bored tube; the rise in height being inversely proportional to the bore's radius.

How it works:

The setup shows the direct comparison between four capillary tubes of different bores. The...

Fluid Mechanics

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This subject is divided into the subtopics below; selecting a subtopic will take you to a list of specific demos that relate to that area. You can browse other subjects from the navigation on the left. You can search for specific demos using the Search...

Friction Blocks

Presentation

Selection of blocks that slide down a variable-angle inclined plane to demonstrate the various aspects of friction.

What it shows:

There are actually three (or more) demonstrations under the wing of this title: (1) A block or box is placed on an adjustable...

Resonant Fountain Tube

Presentation

Standing sound waves in a glass pipe are made evident by the fountains of kerosene inside the pipe.

What it shows:

The air inside a very large glass pipe (partially filled with a fluid) is acoustically excited into a standing wave. Once resonating, the...

Vortex Shedding in Air

Presentation

A thin wire, moving through the air, is made to vibrate in the audio range at the vortex shedding frequency.

What it Shows

When air flows around an object, there is a range of flow velocities for which a von Karman vortex street is formed. The shedding...

Molecular Size

Presentation

Also known as the Ben Franklin pond experiment, after a story in B.F's autobiography.

Olive oil with a known volume is dropped onto water. The water has been dusted with lycopodium powder, which floats on the surface. The oil drop expands, pushing the...

Harvard Natural Sciences Lecture Demonstrations

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About the Catalog This website is an ongoing project to create a comprehensive library of physics demonstrations, simulations, videos, and other useful resources available at the Harvard Science Center. Having evolved from "The Demonstrative Physicist's...