By chance, I saw a man put a piece of paper on a water glass on TV, then held the paper in his hand and quickly turned the water glass upside down. I found that the water in the cup didn't miraculously flow out, so I was curious and tried it myself.
I first took out a cup, a piece of restaurant paper and a glass of water. Then pour the water into the cup, gently cover it with that paper, and then pour it gently, and all the water will flow out. I feel strange: why can't the water on TV flow, but when I do it once, it all flows out? I kind of believe that the program performed by that man on TV is not true. I walked up to my mother with a grain of salt and said to her, "mom, I just did that experiment on TV, but it didn't work." Why? " My mother said to me, "son, can you tell my mother all your experiments?" "ok, mom." I said loudly. After that, I told my mother the details of the experiment. My mother saw the flaw at once and said to me, "son, your paper is uneven and not tight, and water will flow out." As soon as I understood what my mother said, I did it again as my mother said. "Finally succeeded, finally succeeded!" I shouted, and my mother came to praise me. Although the experiment was successful, I still don't understand why I put the paper on a cup filled with water and turned it upside down, and the water didn't come out.
With this question, I looked through 100 thousand why. From this, I found the answer I wanted: the original paper sealed the cup, but it did not flow back because of the suppression of atmospheric pressure. The pressure of atmospheric pressure on paper is greater than that of water column, so the paper will not fall and water will not flow out.
Ah! It turns out that there are wonderful scientific phenomena everywhere around us. In the future study process, I will study hard and use my brain hard. Only in this way can I master more scientific knowledge.
The Science of Life Excellent Composition 2 Life contains scientific mysteries everywhere. As long as we pay attention everywhere and observe attentively, we will certainly find the science in life.
In science class, the science teacher came in with a microphone in his hand. In class, the science teacher asked us to talk to each other. The other party said something, and I heard it clearly. After coming home from school, I finished my homework quickly, and then I started to make a microphone.
The sound tube is made of only two paper tubes, two small disks and a wool. I divided the paper tube into two parts, and one side of both paper tubes was covered with small pieces of paper. Glue the small disc with adhesive tape, then make a small hole in the small disc with a needle, and pass the wool through the hole in the small disc to form a sound tube. I tried, but there was no sound. I failed.
I don't want to do it again. This time, I carefully divided a piece of paper into two pieces, punched a small hole in each piece, glued the small piece with transparent glue, then put the wool in, tied one end of the rope in a knot, tied the other end of the rope in, and tied the other end of the rope in a knot, and it was ready. I tried. I succeeded. Why does a microphone transmit sound? I checked it with my mother's mobile phone. It turns out that the straightened solid sound transmission reduces the spread of sound in the air, so I can hear it.
Things in life are wonderful, waiting for us to discover and explore.
The science of life is everywhere in life, and sometimes it is likely to slip through your fingers. Whether we can catch it depends on whether we can find it. There are many things in life that deserve our attention. We should be good at discovering the little things in life. Often a small matter can cause many people to explore and think, and some even become eternal mysteries. So: Science is all around us.
I remember once I tidied my room and dug out my exercise book. These books are jumbled up on my desk. I found the handwriting of pencils and ballpoint pens in these books. Blue, black and black are different in thickness and clarity. Why?
I did a little experiment on a whim. I'll ask the adults about the structure of paper first. It turns out that the main component of paper is fine fiber. I also learned the composition of the refill and pen ink of two kinds of pens: the refill of a pencil is made of graphite and clay by stirring and firing; The pen and ink of ballpoint pen are made of oil and a special pigment. Then I found two kinds of paper: one is rough and the other is our ordinary exercise book. I drew a straight line on two pieces of paper with a pencil and a ballpoint pen, and found that both were very clear. I wiped it with my hand, and the ballpoint pen remained basically unchanged. On rough paper, two straight lines are very different; Pencil straight line is like a neat row of ants, intermittent: ballpoint pen straight line is continuous, round, smooth and burr-free, and there is little difference between the two straight lines in ordinary exercise books.
Finally, I found that when writing with a pencil, the pencil is attached to the surface of the paper. The rough paper is uneven, and the lead powder is only attached to the protruding place, and there is no trace on the concave surface, so the writing is intermittent. Smooth paper, lead powder is not easy to absorb, so only vague traces are left.
Look! This is the science of life. Many scientists discover science from ordinary things, then think deeply and come to a conclusion. Newton, for example, learned from an apple an extremely ordinary little thing that fell to the ground and discovered such a great achievement as "gravity". This shows that science is in our life, and we should be good at discovering it.