Restless grains. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Restless grains. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

It's easier than ever to make an object move by pushing it with your hand. Is it possible to make rice grains move without touching them? Do this experiment and you will learn at least one way.

Props:

- a chilled can of beer;
- cup;
- 6 grains of rice.

Preparation:

1. Lay out the necessary items on the table.

2. Open the can and pour the beer into a glass.

Let's start the science magic:

1. Announce to the audience: "I have a few grains of rice that just don't want to go to bed. They're always on the move and can't stop."

2. Pour the grains into a glass of beer.

3. Wait a few seconds and see what happens.

Note: Instead of rice, you can take finely chopped spaghetti. Break them into 1 cm pieces and dip them into beer.

After a while, the grains of rice in the glass will begin to float up and down.

Focus secret:

This is because a can of beer contains a gas called carbon dioxide. The carbon dioxide in the can is dissolved in the liquid and is under pressure. When you open a can and pour the beer into a glass, you release this gas. The density of carbon dioxide is lower than that of the liquid in the jar, so its bubbles rise to the surface.

When you pour rice grains into a glass, gas bubbles "stick" to them from the surface. The density of grains combined with bubbles becomes lower than that of beer. The grains covered with bubbles rise to the surface of the liquid. There, the carbon dioxide bubbles burst, and the density of the grains again becomes higher than the density of the beer. Freed from gas bubbles, they again go to the bottom. There, the gas bubbles again "stick" to the surface of the grains, and everything repeats from the beginning. This continues until the beer no longer releases gas. Pretty soon, carbon dioxide ceases to be released, and the grains calmly sink to the bottom.

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