Three experiments with a glass. Entertaining physical experiments at home

ENTERTAINING EXPERIENCES AT HOME
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Three experiments with a glass. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Take a glass and a bowl of water. Immerse the glass in water, tip it over there and pull it upside down. The water will reach for the glass, it will rise much higher than in the basin! But the law of communicating vessels should operate here, a glass is not a hair tube. Apparently, something keeps the water in the glass, prevents it from pouring down.

Keep raising your glass. Here its edges are level with the surface of the water in the basin - smack! There was a smacking sound already familiar to us - and the glass was immediately empty. All the water spilled into the basin.

So, the air that broke under the edge of the glass is to blame? Let's try to change the experience a bit. When immersing a glass in water, leave some air in it. Now raise the upturned glass again. Look, and there is air, but still water reaches for the glass! And until it comes out of the water, the amount of air in the glass will not increase.

By the way, you can make a very simple bird drinker that will automatically fill up with water. The main parts of the automatic drinker are a bottle and a bowl. Fill the bottle with water, and pour a little into the bowl too. Holding the bottle with your finger, turn it over and strengthen it in the stand so that the neck falls below the edges of the bowl, but does not reach its bottom.

Remove your finger - the water will start to flow out of the bottle. But only until the water level in the bowl reaches the neck of the bottle. Stop here! The bottle seems to be clogged.

Three experiments with a glass

And only when part of the water from the bowl is drunk by the birds or evaporates, air bubbles will burst into the neck. Bulk, bulk! The water level will rise again to the neck, and stop again! This will continue until the bottle is empty.

It turns out that water serves as a reliable stopper for an inverted vessel. And is it just water? Is it about her?

Three experiments with a glass

Try to make a second experiment with a glass. Pour water into it up to half, and lightly grease the edges and put a piece of paper on top. Holding the paper with your palm, knock over the glass. Just in case, it is better to do this over a basin or sink. But such a precaution is likely to be unnecessary. You take your hand away, and the piece of paper will still securely close the glass, and not a single drop of water will spill out! The glass can be filled to a quarter, and three quarters, and to the top - this does not change things. A thin sheet of paper flying away from the breath will hold a glass of water!

For the third experiment with a glass, you will need a sheet of blotting paper and a glass plate that completely covers the glass. You can, for example, take a small mirror, just do not pour excess water on it so that the frame does not peel off!

Pouring any amount of water into a glass, cover it with a blotting paper and glass on top. Then turn the whole structure over and place it on the table. The blotter will get wet, of course. A wet spot will spread around the edges of the glass.

Now raise your glass. The glass will rise with it. Turn the glass upside down and try to remove the glass - it was not there! It is no longer removed, the glass of water rises with it. He firmly "glued" to the glass, like a radish to a plate, like an octopus to its victim, like a soap dish to a wall. Rather, it did not stick, but stuck. After all, even here, when you tear the glass from the glass by force, the same characteristic sound will be heard: smack!

What is the matter?

We live at the bottom of the air ocean. Above us is a huge mass of air. Dozens, hundreds of kilometers. And air, as light as it is, still has weight. And he presses on everything that is below. For every square centimeter, air presses with a force of about 1 kg. Therefore, even a small radish with a cut area of, say, 1 sq. see can lift the plate. This air presses the plate against the radish! But you can’t lift a heavy iron on a radish: it weighs much more than 1 kg. The radish comes off the surface of the iron. But the same iron can be held on a larger root crop. Let's say half a beetroot.

Air pressure also holds a column of water in an inverted glass or bottle. In our second experiment with the glass, the piece of paper covering the bottom of the glass is also held in place by air pressure. After all, you pressed it a little when you pressed it with your palm. And if you cover the glass, say, with glass that does not dent, it will fall behind much more easily. You ask: why didn't it work out in our third experiment with a glass? Yes, because we put a blotter. She sucked some of the water out of the glass, so the glass stuck.

Author: Galpershtein L.Ya.

We recommend interesting experiments in physics:

▪ Soap bubbles

▪ Diligent Sawfly

▪ Animated pieces of iron

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