Simple-Science - Simple Experiments (Digest # 20)
Today in issue # 20:
- Batavian tears;
- soap bubbles float in carbon dioxide;
- equilibrist hammer;
- crystal resonance;
- flowers change color;
- funny glue on the water.
Attention:Some experiments may be hazardous to health. When carrying out them, it is imperative to observe safety precautions.
Glass acquires such properties due to abrupt cooling. Once in cold water, the outer layer instantly cools and contracts, while the rest of the substance is still hot. The outer shell compresses the contents and strong pressure builds up inside. This pressure resists shocks and the glass ceases to be brittle. But if you just break the outer shell, then right there this very internal pressure will blow a drop almost to dust. more details
Soap bubbles float in carbon dioxide
The resulting carbon dioxide (CO2), from mixing acetic acid and baking soda, is heavier than air. In the aquarium, the gas sinks to the bottom. Soap bubbles filled with air fall on the surface of the gas. Since we do not see either air or carbon dioxide, the impression is created that the bubbles freeze in the air.
Making a sound, the walls of the glass are vibrating. These vibrations propagate through the air and set in motion the neighboring wine glass. What the fallen toothpick testifies to. You can even out the tone of the glasses with any other liquid.
Flowers change color
The liquid in which the flowers ended up is a mixture of ether and a solution of ammonia (ammonia). Both of these substances are volatile. Ammonia vapor creates an alkaline environment in the flower petals. At the same time, ether vapors extract (extract) dyes from plant cells. Most plant dyes are natural indicators, that is, substances that change color depending on the environment in which they enter (acidic, neutral, alkaline). So in our case, once in an alkaline environment, the dyes changed color. Normal tea behaves in a similar way when lemon is put in it: it brightens, that is, it changes color in an acidic environment. Most violet and pink flowers in an alkaline environment acquire a bright green color, white - turn yellow, autumn red leaves turn green instantly. But yellow flowers, such as buttercups and marigolds, do not change color.more details
Funny glue on the water
BF glue has a high alcohol content. Once in water, alcohol evaporates from drops of glue, which sets them in motion. For entertainment, we painted glue in different colors. It is necessary to mix glue with paints quickly, alcohol evaporates.
You can subscribe to new videos on the Vkontakte page or look at the site with " video for children ".