Does water have skin? Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Does water have skin? Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

"What a strange question? - you say. - Of course not!" But try a few simple experiments with water and your confidence will be shaken.

Pour water into the glass up to the rim. Is it full or not full? Let's check. Pick up the coins and drop them into the glass one by one. If you immerse the coins carefully, without splashing, a lot of them will fit in a "full" glass before the water starts to overflow.

Does water have skin?

Where does the excess water go? After dropping a few coins into the glass, sit down so that your eyes are at the level of the edges of the glass. You will see an amazing thing. The surface of the water became convex, rose like a hump! And the more you lower the coins, the higher the water hump will rise. It inflates like a balloon. But the ball has a "skin". This is his rubber shell.

And by the water? Doesn't she have skin?

And yet water behaves as if it, too, has a shell. Elastic like rubber. On some coin, this invisible shell is torn. A trickle of water runs down the wall of the glass, and the water hump immediately falls off. It's like a balloon burst...

Do one more experience. Lubricate the needle with some fat and carefully place it on the surface of the water. The easiest way to put it is with a fork. Place the needle on the fork and immerse the fork in the water, gradually turning it on edge.

Does water have skin?

When you remove the fork, the needle will remain on the surface! But can she swim? Steel is heavier than water. Sit down again and look at the "floating" needle against the light. You will see that the surface of the water is concave under the weight of the needle. So the needle does not float. It lies on the surface of the water, as on an elastic film. One careless movement, a push is enough - and the film is torn. The needle falls to the bottom. Very perishing fragile have water "skin." Fragile, but still it is. Invisible, elastic film.

A safety razor blade may also lie on the surface of the water. It is also better to lightly grease it. You can lay it with a fork, in the same way as with a needle. Only the glass here is not very convenient. It is small (it will be difficult to remove the fork from under the blade). It is better to take a soup plate or bowl.

You have probably seen water strider bugs scurrying across the surface of the pond. They also slide on the surface film. You can even see how it bends.

Author: Galpershtein L.Ya.

We recommend interesting experiments in physics:

▪ Water hammer

▪ Crawler coil

▪ See the invisible

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▪ Drawing with iodine

▪ Washing in hard and soft water

▪ How to mend torn clothes

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