My new discovery

Memory is a gorgeous summer flower, it is like a tearful fading; memory is a heavenly story, it is like a smile. In the depths of my mind, a memory rushes in: an accidental discovery makes me curious about this world.

That day, the outside was shrouded in dark clouds. Suddenly, the thunder of the rumble sounded, and then a flash of lightning broke through the sky, and the soy-like raindrops fell from the sky. During the thunderstorms, lightning and thunder, the trees were blown up by the wind, and they were crumbling. I was bored by the heavy rain at home, screaming the channel of the TV, and suddenly a science channel attracted me. I am introducing how to make coins float on the water. I can't think of it. The buoyancy of water is much smaller than the gravity of a coin. How can it float on the water? I continue to look down with questions.

The people on the TV set up a glass of water, a dollar coin, a napkin, and then in order to prove that the glass of water and the coin were not specially treated, they asked the audience to verify that the audience did not prove that they were After special treatment. Then continue the experiment. First, they put the cup on the table flat, spread the napkin on the table and put the coin on it; then take the napkin and slowly lay it on the water, waiting for the napkin to gradually get wet; finally the napkin slowly underground It sinks to the bottom of the water, but the coins float on the water. I was amazed when I got here. I couldn’t understand why the napkin would sink and the coins would not? I still struggled to get the answer, and I finally got the answer in the book.

The reason why the material that is much denser than water can float on the surface of the water is due to the surface tension. The surface tension is generated because the molecules in the surface layer of the liquid are larger than the distance between the molecules in the liquid, so there is a mutual attraction between the molecules. The surface layer is like a layer of elastic rubber film, which naturally supports some light objects.

Seeing here, I suddenly realized the mystery. However, this new discovery makes me feel that there are still many strange phenomena that I don't know in this world. It is worth exploring. I believe that as long as I am good at observation and good at discovering, science will often bring me unexpected surprises!

The third day: Li Shiqi