Simple Science - Digest Experiences # 31

In today's digest "Simple Science" we decided to include experiments from our books. Despite the fact that books for children, these experiments are quite able to surprise many adults.

In this issue:

• nails in balance;
• red chemistry;
• clean the spoons;
• water climbs up;
• soda on the edge.

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Nails in balance

The design of the nails does not fall apart because the top nail keeps all hanging nails from falling, which are held by the caps behind it. But hanging nails also keep the upper nail from falling, pressing it with caps to the lower nail. This is the first balance. But the second equilibrium, when all the nails have turned into a single whole and begin to stay on the same vertical nail, is obtained because the center of gravity is in the middle of the structure, while it is located lower than the fulcrum.

Red Chemistry

The juice of red cabbage contains a special pigment that is sensitive to the acidity of the solution - it changes color from red in acid solution (vinegar) to blue in an alkaline medium (soda). In addition to cabbage, many dark blue berries and vegetables have a similar property: beets, blackberries, black currants, blueberries, blueberries, cherries, and dark grapes. A solution of juice in water has a purple color. When mixing solutions of vinegar and soda, the reaction occurs with the release of bubbles of carbon dioxide, and the acidity becomes closer to neutral - the color of the solution becomes closer to purple.

We clean the spoons

Dark scurf on spoons occurs due to the fact that the metals that make up the spoon, are oxidized. Aluminum, thanks to a solution of soda, selects oxygen for itself, thereby restoring spoons to its original appearance.

Water is climbing up

When the bottle is heated, the air inside it expands. When we drop a heated bottle into cold water, it starts to cool quickly, and with it the air trapped inside also cools. Cooling down, the air is compressed and sucks tinted water. Until the temperature of the bottle and the water is equal, the water will rise higher. Make sure that the air in the room does not get into the bottle - lower the bottle as water is sucked in.

Rib soda

If the amount of soda is left slightly higher or vice versa, then the center of mass of the can and soda will be shifted to the left or right and the bank will fall. The principle of this experience is similar to the experience of “nails in balance”: for a stable position of an object it is necessary that its center of gravity be on one line or below a fulcrum.

Books "Simple Science"

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