Three fountains. Fun physical experience at home

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Three fountains. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

You can easily make three spectacular fountains.

The first is a bottle - with a tube inserted into the cork. You can, for example, take a glass tube with which letters are written. Such tubes are sold in sets in stationery stores. Or you can take an ordinary pharmacy pipette. Only her glass tube is too short. Therefore, it is better to leave the rubber bag, cutting off its bottom with scissors.

Burn a hole in the cork with a hot nail and insert the tube into it very tightly. If it turns out rather weak, fill the gap with wax or var. Find a small bottle with a cork that fits snugly. Fill this bottle almost to the neck with water, lightly tinted with ink, and plug it with a cork.

The water in the bottle is at atmospheric pressure. Outside pressure is the same. How to make the fountain score? There are two ways to do this. The first is to reduce the pressure outside. From coin experience you already know how it's done.

Place the bottle on a small plate. Pour some water into this plate and lay out the sheets of blotting paper. Take a three-liter glass jar and hold it upside down over a burning candle, over a stove or electric stove. Let it warm up well, let it fill with hot air.

Three fountains

Ready? Put it upside down on a plate, the edges on a blotting paper. The bottle is now covered. The air in the jar will begin to cool, the water from the plate will be absorbed. Soon it will all go under the bank. Hey, watch out, now the air will slip under the edges! But we did not put a blotter in vain. Press firmly on the bottom of the jar, it will press the wet sheets, and the air will not slip through. The fountain will beat!

The fountain can be activated in another way. The air in the bottle must be compressed! Take the upper end of the tube into your mouth and blow in as much air as you can. Bubbles will escape from the lower end of the tube.

Three fountains

Now let go. See how beautifully our fountain beat! Too bad it doesn't last long. This is because the supply of compressed air runs out quickly. To make the fountain work longer, you need to pour a little water into the bottle. All the same, it will be enough for the fountain to work, and more air will enter the bottle. And you don't need to color the water with ink. After all, this fountain will not beat under a glass jar, it will be clearly visible even without ink. And here you have to take the tube in your mouth.

Three fountains

The third fountain is similar to the second. Increased pressure is created inside the bottle. Only not by blowing air, but in a different way, which you already know. Put a few pieces of chalk in a bottle and fill it three-quarters full with vinegar. Quickly cork it with a cork with a straw and put it in a sink or large basin so that the vinegar does not get where it should not. Indeed, carbon dioxide will begin to be released in the bottle, and under its pressure, an vinegar fountain will clog from the tube!

Author: Galpershtein L.Ya.

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