Vortex rings. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Vortex rings. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Dilute potassium permanganate (potassium permanganate) in a small jar, bringing the solution to a dark purple color. Take a glass jar and fill it with water. Then pipette a solution of potassium permanganate and start dripping into the jar from a height of 1-2 centimeters from the surface of the water. The tip of the pipette should not oscillate. A drop, falling into the water, turns into a ring of the correct form, which, falling into the depth of the jar, gradually increases in size.

vortex rings

Consider how this ring turned out.

When the drop fell into the water, it, having met with great resistance, flattened out. When moving further, deeper, the edges of the flattened drop are wrapped due to friction against the water. It turns out a vortex ring in the form of a donut rotating around its annular axis.

For the experiment to turn out well, the hands should not tremble at all. To do this, put your elbows on the table, hold the pipette with both hands, leaning on the edge of the jar. Drops from the pipette should fall freely, they do not need to be squeezed out with effort.

Now it has been told how to observe vortex rings in water. But there is another interesting experience - blowing air rings.

The famous scientist, physicist Robert Wood, demonstrated large smoke rings during lectures. They flew out of the opening of the large box and raced through the lecture hall. The large ring was so powerful that it "knocked the cardboard box at the other end of the lecture table to the floor," Wood wrote in his diary.

But Wood also demonstrated invisible air rings. Here is what he writes about this: "... Smoke is not at all necessary for the formation of a ring, an invisible air ring hitting various objects was an even better demonstration."

It is not difficult to set up experiments with air rings, for this you just need to find a suitable wooden box without slots and holes. It can be a box about 20x15x15 centimeters in size. In its bottom you need to cut a round hole with a diameter of 5 centimeters. The edge of the hole must be sharp. Seal the open part of the box against the hole with good drawing paper, after wetting it (you can also stick an elastic band from a balloon). After drying, it will stretch like skin on a drum. When you're done, lay the box on its side and aim the hole at someone's palm. Hit the stretched paper with your finger, the air in the box will shrink sharply, an invisible ring will fly out of the hole and gently push the palm you were aiming at (a very sensitive indicator is the candle flame).

vortex rings

Rings can be made visible. To do this, put a tin can with a piece of smoldering cotton in the box. Then, each time you click your finger on the paper, round smoke rings will fly out of the hole. Their origin is the same as the rings in the water. Only the deceleration of the portion of air flying out of the box occurs at the edges of the hole.

Author: Rabiza F.V.

We recommend interesting experiments in physics:

▪ Behavior of two drops

▪ Weak spot of ice

▪ magic lantern

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