Miniature Plateau experience. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Miniature Plateau experience. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

The experience of the physicist Plato clearly shows how, under the action of surface tension forces, a liquid turns into a ball. For this experiment, alcohol is mixed with water in such a ratio that the mixture has the density of an oil. Pour this mixture into a glass vessel and introduce vegetable oil into it. The oil is immediately located in the middle of the vessel, forming a beautiful, transparent yellow ball. For the ball, such conditions are created as if it were in zero gravity.

We will do this experience in miniature. And the size of the ball will be small, and it will be possible to observe it only for about ten seconds.

Find a small flat bottle of perfume or cologne. A round bottle is not suitable, because if you look through it at the ball, the spherical shape will be distorted. The bottle must be clean and dry. Fill it with vegetable oil. Then pour water into some small clean jar and dilute potassium permanganate in it so that the water turns purple.

Pick up a solution of potassium permanganate with a pipette and, piercing the surface of the oil in the vial, release one small drop. A drop, entering the oil, will immediately turn into a purple ball and begin to slowly sink to the bottom of the bottle. Water is slightly denser than oil, so the ball sinks, but during its journey to the bottom, it is almost in a state of weightlessness, so its shape is close to spherical. The smaller the ball, the slower it descends and the closer its shape to spherical. After all, its shape is affected not only by gravity, but also by friction against oil.

Let's continue our experience. Add a little clean water to the oil bottle, it will immediately sink to the bottom and form a small layer, let's say, one centimeter. There is a clear line between oil and water. Start releasing water drops from the pipette into the oil again. They, as before, turning into balls, will sink to the bottom. But, approaching the border of oil and water, still at some distance from it, the balls press so hard on the oil that this pressure makes a recess in the border with water, and only then they sink into it. See what this glycerin drops experience would look like. Glycerin is denser than water. Glycerin balls both descend faster and put much more pressure on the oil-water boundary.

After the experiments, let the oil settle well and carefully pour it without sediment into a clean dish. The oil can be used for cooking.

The experience of Plateau in miniature form can also be done in another way. But for this experiment, you need to take a very small flat vial so that quite a bit of oil can fit in it - about two tablespoons. The fact is that if after the previous experience the oil could be used for food, now the oil will become unusable, and the food must be protected.

So let's get to the experience. Your oil is ready, you need to prepare a mixture of water and cologne. Take a thimble as a dish. Drop a few drops of water and the same amount of cologne into it. Stir the mixture, draw it into a pipette and release one drop into the oil. If the drop, becoming a ball, goes to the bottom, then the mixture turned out to be heavier than oil, it must be lightened. To do this, add one or two drops of cologne to the thimble. Cologne is made from alcohol and is lighter than water and oil. If the ball from the new mixture does not start to fall, but, on the contrary, rises, it means that the mixture has become lighter than oil and a drop of water should be added to it. So, by alternating the addition of water and cologne in small, drop doses, it is possible to achieve that a ball of water and cologne will "hang" in oil at any level.

Miniature Plateau Experience

The classic Plato experience in our case looks the other way around: the oil and the mixture of alcohol and water are reversed.

Author: Rabiza F.V.

We recommend interesting experiments in physics:

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▪ Turning water into blood

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