?
Writing on the theme of popular science knowledge? Unconsciously, Grandpa Dong left, and Miss Chun came to the world in colorful skirts. I followed my mother to the park to enjoy flowers. I smelled the flowers as soon as I entered the door, and I was immediately relaxed and happy.
? Look! Peach blossom girl poked her head out, some with pink smiles, some hiding behind, shy; Pear trees, pear flowers, white as jade, they are so pure; Not to be outdone, Yingshanhong bloomed bright red flowers and decorated the earth with colorful flowers. These flowers give off a charming fragrance and attract a group of people? Buzzing? Buzzing bees and dancing butterflies make this place full of vitality.
? At this time, I found clusters of chrysanthemums in the flower bed. From a distance, it looks like purple fireworks that have just been set off. A gust of wind blew, and the petals fluttered with the wind, dancing like a group of butterflies. How beautiful! I leaned over and smelled it. Hey, why can't I smell the fragrance? I asked my mother curiously: Mom, why is Guayeju not fragrant? Why are some flowers fragrant and some flowers not fragrant? ? Mom said shyly: I don't know, or let's Baidu! ?
? I type: Why are some flowers fragrant and some flowers not fragrant? ? Then carefully check the explanation on Baidu, and then suddenly realize. It turns out that the fragrance of flowers comes from an oil cell in the middle of petals, which constantly secretes fragrant oil with fragrance. Because aromatic oil is volatile, it will be emitted with water when you are in bloom. There are also some flowers, although there are no oil cells, but they also smell good. It turns out that their cells contain a substance called sugar embryo. Sugar embryo itself has no fragrance, but when it is decomposed by enzymes, it can also emit fragrance. Generally speaking, white flowers and light yellow have the strongest fragrance. Oh, it turns out that fragrant flowers are colorless and colored flowers are not fragrant. This is really an interesting discovery!
? From this small discovery, I know that as long as I observe carefully and study hard, I will make more interesting discoveries and understand many mysteries of nature!
? A composition with the theme of popular science knowledge
? I am curious about many things, like once, my mother just bought an alarm clock, and I smashed it that day. Because I think its second hand seems to go faster than the big clock outside, I want to take it apart and have a look. The second hand has dropped and lost. I always like to ask my mother this question and that question. Mom is often confused and can't answer. So, just after our summer vacation this year, my mother couldn't wait to buy me a copy of Touch Science for me to read at home.
? I have carefully studied the whole book, which contains many interesting scientific experiments, such as box magic, ice brick cutting, clavicle surgery and so on. What do I like best? Clavicle surgery? It was fun. In order to show my family, I practiced secretly in my room alone. First, I put my feet together and stood against the wall. I stretched out my arm and adjusted my distance from the wall so that my fingertips just touched the wall. I insisted on keeping my arm straight, swinging my arm down behind my body, and then pulling my arm back to its original position. By this time, my fingertips could not touch the wall. Hey, hey, my arms seem really short. It's so interesting. When my parents come back from work, I will perform magic tricks for them. See them one leng one leng. Does anyone understand why? I have to decrypt it: it's not that your arms are getting shorter, but that when you put your arms behind your body, you will unconsciously lean forward to keep your balance. And when you swing your arm forward again, in order to keep balance, your body will unconsciously lean back, making your arm just right? Shorten? Can't touch the wall.
? We should study science, love science and apply science. Science is actually around us.
? A composition with the theme of popular science knowledge
? After reading "Shenzhou 10 Space Teaching", I secretly vowed psychologically: I must be an astronaut when I grow up! Fly the space shuttle into space. Because only in space can we do some actions that we can't do in normal life, for example, astronauts can float around in the cabin, but if we want to float around in the room, it is impossible; You can see the whole picture of our beautiful earth on the space shuttle; The endless universe and countless planets, comets and meteors. .......
? At the same time, I also admire our astronauts. They can use Newton's second law to weigh astronauts in weightlessness and then assemble them to make space scales.
? While admiring our beloved astronauts, I also learned a lot: I know that water will float in weightlessness in space. The astronauts showed us that the metal ring was taken out of the water and the water in the ring was stuck. When the metal ring is gently swung, the water in the ring does not fall. I know, too? Simple pendulum? You can't swing from side to side in space, you just need a little force to push this to do the experiment? Little ball? ,? Little ball? You will do a rotary motion.
? In the video, the astronaut asked us:? What other methods can be used to measure quality? ? I think: as long as we know the rotation frequency of astronauts on the earth under the same conditions and then measure the rotation frequency in space, we can know whether astronauts are fatter or thinner than before.
? A composition with the theme of popular science knowledge
? Some people think that science is difficult to understand, while others think that science is too abstruse to explore. In fact, science is everywhere around us, no matter how big or small, it can be solved by scientific methods.
? Let me talk about chopping wood. Perhaps many people think that chopping wood is a simple matter. Just pick up an axe and chop it hard. Actually, it is not.
? One day, my father bought a big bundle of firewood, smiled at me and said, Yujie, let's have a competition today to see who has the greatest ability, shall we? ? Of course I won't bow my head and admit defeat. Isn't that chopping wood? Don't trust me. I can't
? The game started, only to see my father break up easily. I also split it with all my strength. At this time, I found that my father cut wood so lightly, and I thought, well, my father must have kept that sharp axe for himself. ? I whispered to my father: Dad, let's change an axe. I like yours. ? Dad switched with me without saying anything. My axe is like a duck to water in my father's hand, and I have done better. Before long, my father's share was finished. Look at me, my hands are blistered, I'm so tired that I'm sweating all over, and my task is still early.
? I must admit defeat, but I must lose clearly. I asked my father: How did this happen? ? Dad said: if you don't chop along the wood grain, you will waste a lot of energy, and if you use scientific methods, chopping along the wood grain will be very labor-saving. Also, if the firewood is long and you want to cut it down, you can't put it flat on the ground, but put it on your head, which will cut it down. ? I chopped wood in the way my father said, and it was finished in a short time. The scientific method is really useful, so I have to give up.
? Although I lost, I am glad that I have gained another life experience, and science is around us.
? A composition with the theme of popular science knowledge
? Today, we did three small experiments. Let me show you this wonderful process!
? The first experiment will take two days, and there is no result yet.
? The second experiment is to lift a cup full of rice with chopsticks, and the teacher is also involved. He tried once in his own successful way at home, but failed. Some students said that water was needed, but still. Failure? Yes
? The third experiment began. The content of this experiment is to let an egg bigger than the bottle mouth leak out of the bottle mouth. We did as the teacher said.
? Methods: First, pour boiling water into the bottle and cover it with your hands until it is full of steam. Then we pour out the hot water. Then put the eggs on it, and we watched the eggs fall down bit by bit. Finally, the teacher turned the bottle upside down and poured hot water into the bottom of the bottle. The egg magically came out of the bottle again. Do you find it strange?
? However, to be honest, even weirder is yet to come! Our experiment of raising a glass with chopsticks succeeded! Like a dead man? Resurrection is amazing It will take some time to succeed, and it will harm us. False alarm? A game.
? It seems that this scientific experiment is really amazing!