Insidious blot. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Insidious blot. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

What happens when you blot a blot with blotting (or newsprint) paper? The blot slowly creeps up, spreads, branches...

Insidious blot

How so? After all, according to the law of communicating vessels, everything should be the other way around! The inkblot should have come down, flowed down from the blotter. But she doesn't want to do it. What about a lump of sugar on the surface of coffee or tea? You have watched more than once how a brown liquid crawls higher and higher over it, how white sugar turns brown, settles, spreads ...

Oh, if only he could talk! He would probably have exclaimed: "Stop, insidious liquid! You do not dare to crawl up, your place is below. So it is said in the great law of communicating vessels!" But sugar can't talk. He is silent and meekly melts. And the liquid creeps all the way up, obeying some other law of nature. But which one?

To understand what is the matter here, look at the surface of the water poured into a clean glass. Do you see anything special? And yet there is something interesting there.

Look, at the walls of the glass, the surface of the water is bent upwards. It looks like the water wants to crawl up the sides of the glass. Wants and can't. She managed to make only one, very small step. And yet, once this step is taken, it means that there is some kind of force that pulls the water up. Only this force is small, but there is a lot of water in the glass.

Well, what if the glass was narrower? Take a narrow tube, a pharmacy pipette. Remove the rubber bag from it and lower the straw into the glass with the wide end. First lower it deeper, and then pull it out a little. You will see that the level of water in the pipette is higher than in the glass, two millimeters. This is already something!

Insidious blot

Well, what if you lower the pipette with a narrow end? Lowering deeper... Pulling out... Stop! Look, the water level here is higher than in a glass, already almost a full centimeter! Now it is clear: the thinner the tube, the higher the water crawls along it.

Are there tubes in a blotter and a lump of sugar, you ask? Yes, they are there. But they can only be seen under a microscope. These are the tiny gaps between the individual fibers of the blotter. These are very narrow slits between individual sugar crystals. Quite narrow? Yes, this is exactly what you need! That is why water rises so well, that is why it does not obey the law of communicating vessels!

This property of liquids, this ability to rise along tubes as thin as a hair, is called hairiness. Or capillarity, from the Latin word "capillaris" - "hair".

Author: Galpershtein L.Ya.

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