Simple Science - Experiment Digest # 31


    In today's digest “Simple Science” we decided to include experiments from our books. Despite the fact that books are for children, these experiments are quite capable of surprising many adults.

    In this issue:
    • nails in balance;
    • red-headed chemistry;
    • we clean the spoons;
    • water rises;
    • soda on the rib.

    Nails in equilibrium

    The construction of nails does not fall apart because the top nail keeps all drooping nails that are held by hats from falling from falling. But the drooping nails also keep the upper nail from falling, pressing it with hats to the lower nail. This is the first balance. But the second equilibrium, when all the nails have become a single whole and begin to stay on one vertical nail, it turns out because the center of gravity is in the middle of the structure, while it is located lower than the fulcrum.

    Red-headed chemistry

    Red cabbage juice contains a special pigment that is sensitive to the acidity of the solution - it changes color from red in a solution of acid (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, dark grapes. The solution of juice in water is purple. When mixing solutions of vinegar and soda, a reaction occurs with the release of carbon dioxide bubbles, and the acidity becomes closer to neutral - the color of the solution becomes closer to purple.

    We clean the spoons

    Dark plaque on the spoons appears 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 their original appearance.

    Water rises up

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

    Rib soda

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

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