The secret of soap bubbles. Fun physical experience at home

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The secret of soap bubbles. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

What is the secret of soap bubbles? They are found in the same phenomenon, which creates a "skin" near the water. Only the composition of the solution for bubbles is specially selected so that the film is stronger and more elastic. This film on the liquid surface is always tightly stretched. Therefore, the whole phenomenon is called surface tension.

To once again be convinced of the elasticity of the surface film, do a few more experiments with a soap solution.

Dip the wire ring in the soap solution and carefully remove it so that a soap film forms on it. Tie a small loop from a piece of thread, moisten it with soapy water and carefully place it on the film. The eyelet will lie as it lay down, uneven, sloppy. But try touching the corner of the blotter to the soap film inside the loop. Oh my, how she's gonna make it!

The secret of soap bubbles

Inside the loop, the film will burst, and the one that remains outside will stretch the thread into the correct ring. This ring will be stretched by the tension of the rim of the film remaining between the thread and the outer ring. Surface tension acts equally in all directions. Therefore, the thread ring will be located exactly in the middle of the wire ring!

And here is another very illustrative experiment with surface tension. Bend the wire into a rectangular frame with a handle. Tie a thread between the sides of this frame so that it sags a little, and to the middle of this thread - another thread, more authentic. Let it hang with its tail.

The secret of soap bubbles

Now dip the entire structure into the glycerin soap solution prepared for the bubbles. Slowly remove the frame - a soapy film forms on it. The threads lie freely on the soap film. But if you touch the film at the bottom of the frame with a piece of blotting paper, it will burst and the transverse thread will stretch upward in an arc.

This is reminiscent of the experiment with the thread ring. But it was not for nothing that we also tied a thread "tail". Gently pull on it - and the hole in the film will take the form of a double-leaf gate. Let go of the thread - and again the film, like rubber, will pull the transverse thread in a semicircle.

Author: Galpershtein L.Ya.

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