7 selected essays for youth science popularization
Technology is a symbol, it represents the primary productive force, enables people to continuously create a better life, and leads us to the future Explore and pursue excellence. Below I will bring you a selection of popular science essays for teenagers. I hope you all like them.
Selected Essays on Popular Science for Teenagers 1
On a Sunday in August, after the continuous drizzle moistened everything, the sun showed its smile again and the birds sang happily. , the grass and trees are dripping with dew, as if they are praising the light rain. The rose flowers on both sides of the road, red flowers stand upright on the green branches and leaves, and the sun is floating on the gorgeous flowers of various colors. On such a beautiful day, my mother and I came to visit the China Science and Technology Museum.
The China Science and Technology Museum is located on the North Third Ring Road in Beijing. It is built of red bricks and has three floors. There is also a silver circular building next to the China Science and Technology Museum, which is the famous "Changing Screen Cinema".
My mother and I first came to the "experimental venue" on the second floor. At this time, the experiment had just begun. The lecturer aunt took out a flower bud made of alloy material, and then took out a hair dryer. When the hair dryer was used to heat the flower bud, the flower bud slowly bloomed. After turning off the hair dryer and the temperature dropped, the blooming buds gradually closed again. The narrator aunt said that this phenomenon is called two-way memory.
The narrator’s aunt picked up another spring made of another alloy material. A small stuffed duck was tied to one end of the spring. She asked a child to hold the cyanotic duck and then warmed the spring. , the spring gradually straightens and becomes a straight wire. When the temperature drops, the spring is still straight and cannot return to its original position. Only by heating it again can the spring return to its original position bit by bit. This phenomenon is called one-way memory.
After the explanation, I learned that this material has great uses. For example, it is commonly used in smoke alarm devices in hotels. The third experiment is the "Faraday Cage". There is a large iron cage with insulating panels placed inside so that people standing on it can be isolated from the ground. The narrator's aunt invited the two uncles into the cage and closed the door. At this time, she pressed the power switch and the cage became electrified. She told everyone that the voltage of the cage at this time was 50,000 volts. Wow! People were worried about the people in the cage, but the people in the cage were not in danger. They even dared to touch the cage with their hands. Do people outside dare to touch the cage? The narrator's aunt said she didn't dare to take the risk. She took a long pole with a piece of wire on the top. She used the top of the pole to touch the cage, and saw blue sparks flashing and a snapping sound. It was really scary! Why? The narrator aunt told us: This is because the people in the cage are standing on the insulating board. The voltage of any part of their body is 50,000 volts, and the voltage of the cage is also 50,000 volts, which is zero voltage. People outside are standing on the ground, and the ground voltage is zero. The voltage of the cage is 50,000 volts, so people outside are strictly prohibited from touching the cage. This experiment also told me a truth - children cannot easily touch electricity, because the presence and absence of electricity cannot be seen with the eyes.
After watching the experimental performance, I watched "Wonderful Water Drops", "Submarine", "Soap Film", "Photo Wall", "Is It You or Me", etc., which made me learn Lots of science.
China Science and Technology Museum, you are like a book that enables people to learn scientific knowledge; you are like a huge picture that shows people today's science. I praise you - China Science and Technology Museum! Selected Essays on Popular Science for Teenagers 2
With the development of science and technology, the shadow of science is everywhere around us. It stays with us at any time and helps us solve some problems in life. It can be seen that science is still very important to us. Some people may ask: What is science? I think science is what has not been discovered yet and needs us to discover, study, and explore. But I think the most important thing is the help science brings to people, how people discover it and use it. In fact, science is all around us. As long as we pay attention and observe, I think you may be the "Einstein" of the future.
That happened during the summer vacation. During the summer vacation, the weather was extremely hot. Even my puppy often stuck out his tongue, as if to say: "It's so hot, it's so hot..." Due to the hot weather, , mosquitoes are about to show off their skills. When it comes to mosquitoes, everyone hates them and calls them "vampires."
Yes, every evening, mosquitoes often attack us in swarms, and sometimes they even disturb us from sleeping well all night. Who doesn’t hate such vampires? But strangely enough, we have a strange feeling for mosquitoes. But don’t get me wrong, this wonderful feeling is not a love for mosquitoes, but a scientific interest. As far as I know about the living habits of mosquitoes, I found that their activities are closely related to weather changes.
Everyone has this experience! In summer and autumn, whenever the rainy season is about to come, mosquitoes are extremely active. As people often say: "Mosquito bites are fierce today, but a rainy season is reliable." "Some people often say: "There are half as many mosquitoes in July and half, half as many mosquitoes in August, and half as many mosquitoes bite in September." So why is this? It turns out that mosquitoes are very sensitive to changes in the surrounding electric field. Under normal circumstances, the surrounding air is negatively charged, and the cloud and rain areas are positively charged. When a thunderstorm area appears in the nearby sky and gradually moves towards me, the mosquito will quickly feel the changes in the surrounding electric field, so the thunderstorm is coming soon, so it will try its best to bite people and suck blood before the thunderstorm to mature its eggs. , after the heavy rain, it happens to lay eggs.
People's diet is also very important. For example, it is not advisable to have a cup of tea after a meal. Many people have the habit of drinking tea after putting down their rice bowls. In fact, this is not advisable. Because you have just eaten, your stomach is full of food, and gastric juice is being secreted. If a large amount of tea enters the stomach, it will dilute the gastric juice and affect digestion. At the same time, it also increases the burden on the stomach and increases abdominal pressure, which is also detrimental to the heart. Experts from the Medical College of Georgia in the United States pointed out that drinking strong tea after meals is more detrimental. Because tea contains caffeine and tannins, the former excites nerves and can cause insomnia; the latter combines with the protein in the food in the stomach to form a solidified substance that is not easy to digest, affecting the digestion and absorption of protein, etc.
There were many, many more examples like this at that time, but we just didn’t discover them. I believe that in the near future science will become a necessity for us and we will use it every moment. Selected Essays for Teenagers' Popular Science 3
Hua'an County is the beautiful home where I live. The trees on both sides of the Jiulong River artificial lake are lush and green, and the river is so green. The blue sky, white clouds, houses, and green trees are reflected on the river, like a beautiful picture. Beautiful Hua'an is full of harmony.
In the community
The grass in the community is green and the unknown flowers are blooming. It is so beautiful and clean. Children happily go to school in small groups carrying schoolbags; after school, they are humming songs, talking and laughing, jumping home like little rabbits. After the children have finished their homework, they get together to play hide-and-seek, ride bikes, play football and other games. Sometimes our senior brothers and sisters invite us to skate and skateboard together, watching the colorful lights forming a colorful dragon, and we enjoy it Smiling and cheering, not to mention how happy I am!
Next to the waiting station
Everyone waited patiently for the arrival of the car, but the strong sunshine left sweat marks on people's faces. Finally, the car came to a stop, and everyone rushed towards the stop. With a "swipe" sound, the car door opened, and people got on the bus in order. The scorching heat inevitably makes people upset, but no one cut in line or pushed me. When I got on the bus, there were no seats left. At this time, a little brother greeted enthusiastically: "Brother, come and sit with me!" My little brother and I looked at each other and smiled, huddled together. The car continued to drive forward. After a while, another old lady came up, and several young people took the initiative to give up their seats. The old lady's face was filled with a happy smile. What a beautiful picture of harmony.
Artificial lakeside
As night falls and the lanterns are turned on, the Jiulong River becomes a sea of ??lights, making it even more beautiful. The trees on both sides of the strait have put on bright new clothes, strings of colorful lights are confusing, and neon lights on high-rise buildings are flashing, reflected on the lake, like stars in the sky twinkling. The new bridge erected on the artificial lake is like a rainbow, connecting the north and south banks, adding a lot of charm to the artificial lake. After people had eaten, they went for a walk on the promenade by the lake, either walking quickly or walking slowly. It was so comfortable. The cool breeze gently blew on the face, making people feel refreshed. When you are tired from walking, you can sit on the shore or take a rest on a bench and enjoy the tranquility of the night. Young parents hold hands with their toddlers, smiles on their faces.
Looking at the pavilion by the lake, the old people in groups of three and two are talking and laughing, recalling bits and pieces of the past. Hearing their hearty laughter, it seems like they have returned to their youth. This scene What a happy scene.
A harmonious home is beautiful, civilized, and warm. I love my home. Selected Essays for Youth Science Popularization 4
The little reporters have activities again. This week we will go to the Youth Science and Technology Activity Center - Municipal Exhibition Hall to participate in a large-scale science popularization spring outing. On the morning of April 17, my sister and I I put on my little reporter's vest and badge early and set out excitedly, thinking that I could have close contact with giant snakes, giant turtles, lizards, etc., and experience the magical three-dimensional visual charm of 3D and 4D movies for free, and learn about I was very excited and looking forward to the scientific mysteries of 3D and 4D stereoscopic movies. On the way out, my sister and I kept humming songs and running and jumping happily. At 9 o'clock, we arrived at the entrance of the exhibition hall on time. I saw that the young reporters wearing bright red vests had already arrived early.
While waiting for the big reporter to sell tickets, we little reporters were all chirping excitedly...Ah, we can finally go in. We walked in impatiently. As soon as we entered the door, there was a big brother. We were given a set of stereoscopic glasses for free, which was really nice. It seems that being a young reporter is a good thing. We went to see a movie first, but there were so many people there that we couldn’t see it at all. So we had no choice but to go see the animals. I saw giant tortoises and lizards, century-old tortoises, are there any? When I saw them, it was real. I quickly took a camera to take pictures. Those hundred-year-old turtles shrank their heads one by one as if they were scared, and only one stuck out his head, as if to say: "Who are you, why are there so many people?" This is the first time I have seen such old turtles. I also understand why people often call turtles shrunken turtles, because they always hide their heads inside. Isn’t it interesting? And the lizards, as for the lizards, were motionless next to the branches, looking like fakes.
Immediately afterwards, we went to the Magic Island again, and we also got a set of exquisite Liu Qian magic props for free. Watching Liu Qian’s skillful magic performance, I was really envious, but I couldn’t learn it. I just thought: Why is magic so difficult to learn? So I looked carefully, and slowly I saw something and got a little bit good at it, so I thought, isn't it difficult? It seems that everything you do needs to be done carefully. Yes, while walking, I suddenly saw a lot of people gathered together. I felt very curious, so I immediately squeezed in to take a look. Wow, it turned out to be the long-awaited Pleasant Goat and Big Big Wolf, and everything in it was amazing. It's very weird. After several modifications, the garbage turned into a very delicious can. The Huwei Tai Sui there is a cat, not a tiger, and Abao is not a leopard, but a dog... The lively pictures and plots made us all laugh. So interesting.
Time passed so fast that we forgot all about it. When we reluctantly walked out of the exhibition hall, we were still not satisfied. The weather is so good today, just like my happy mood. The popular science spring outing has made me get closer to science and understand the mysteries of science. I really hope to sow the seeds of science exploration into everyone's heart. Selected Essays for Youth Science Popularization 5
Science is closely related to life, and many magical phenomena in life can be explained by scientific knowledge.
Don’t wear white in winter and black in summer. "This is the experience that people have summed up from their daily life practice. Do you know the scientific truth it contains?
The natural environment we live in is colorful and beautiful, with red flowers, green grass, and blue flowers. Colorful sky, white clouds... various objects have their own colors. However, these bright colors all disappear in the dark night. This shows that objects only appear under the illumination of sunlight (white light). Color. So, why do various objects have different colors when illuminated by the same light source? We know that sunlight is a mixture of red, orange, yellow, green, blue, indigo, and violet light. . Different objects have different absorption and reflection capabilities for different colors of light. People cannot see the light absorbed by the object, and only the reflected light can be seen. Therefore, a certain object can reflect. What color of light appears to us as what color it has.
For example, red flowers can only reflect red light and absorb all other colors of light; white things can reflect light of all colors, so they look white; and black things can absorb all colors. There is no light reflected back, so it looks black. The sun not only brings light to people, but also brings a lot of radiant heat. For radiant heat, black only absorbs and does not reflect, while white is just the opposite.
Generally speaking, dark-colored things absorb more sunlight and radiant heat and reflect less; while light-colored things reflect more and absorb less. Therefore, people like to wear light-colored clothes in summer, such as white, gray, light blue, light yellow, etc. These colors can reflect a lot of light and radiant heat and make people feel cool; in winter, it is best to wear black and dark blue clothes. Well, they can absorb a large amount of light and radiant heat, and people will naturally feel warm. Once people understand the laws of nature, they can utilize them in production technology. The surfaces of large open-air gas tanks and petroleum tanks are painted silver white to improve their ability to reflect sunlight and radiant heat, so that the temperature of the tank does not rise too high, which may cause an explosion.
People also use the principles of reverse and absorption to conquer nature and make it serve humans. There is a Qilian Mountain in northwest my country, which is covered with thick ice and snow. However, because the mountain is very high and very cold up there, even in the hot summer, the strong sunlight and radiant heat are reflected back by the dazzling white ice and snow, so the snow cannot melt. As a result, large areas of fields under the mountains were deserted due to lack of water. Selected Essays on Teenagers' Science Popularization 6
On September 13, the teacher walked into the classroom excitedly and said to us, "This afternoon, the science popularization caravan will drive into our Dongjun Primary School."
The students discussed with each other. Some said, what kind of car is that? Is it different from other cars? Others said that it must be a high-tech product. We are looking forward to it curiously and want to know. What exactly is a technology caravan and what functions it will have.
The moment we have been waiting for finally arrived. The teacher asked us to line up and walk to the playground. We hurriedly went down the stairs. As soon as we reached the first floor, two aunts wearing the same clothes gave us A pair of 3D glasses, the whole class took the 3D glasses, and the two aunts took us to the playground. Only now did I understand that they were our "tour guides"
Under the leadership of the aunts, We came to each "TV", and I was watching an introduction in a "movie" about dinosaur eggs: The longest axis of the dinosaur egg fossils discovered by scientists so far is 56cm, and the shortest axis is 38cm. I walked to another dinosaur video, and a huge dinosaur stretched out its sharp claws and clawed at me. For a moment, the sound of dinosaurs appeared in my mind. After a few seconds, I realized it. The instructor aunt said to us: "The largest dinosaur fossil discovered by humans is as heavy as 20 elephants, and whales are also heavier than this." Dinosaurs are much smaller, but the smallest dinosaur is only as big as a pigeon. "It seems unbelievable!
After watching, we took off the 3D glasses, and I was surprised to find that I just watched it. The video I received turned out to be a picture. I couldn't help but sigh in my heart: Technology is really amazing. Then, the aunt took us to visit "Solar Power Generation", "Visible Sound Waves", "Flip Heads", "Invisible Force", "Flying Bowl"... This time we visited the "Science Popularization University" "Caravan" fully demonstrates to us scientific principles such as mathematics, optics, and electromagnetism. It’s really an eye-opener for me!
The science and technology caravan has introduced us to many scientific discoveries and principles. I believe that the science popularization caravan will definitely drive into rural areas and mountainous areas, bringing more children to rural areas and mountainous areas. Experience the development and magic of technology. Broaden our horizons, enrich our knowledge, and ignite our yearning and love for science.
My article mainly writes about the speed of technological development, the impact of science popularization caravans on primary school students, allowing primary school students to see dinosaurs and other rare animal materials at close range, and selected essays for youth science popularization 7
Ink is used for writing. However, ordinary ink is difficult to remove after writing, which hinders the recycling of paper. Today, I saw a magical ink in the "I Love Inventions" column.
According to the inventor of this ink, Professor Dong Chuan: "The magic of this ink is that after writing, this ink will disappear under the action of light and water. So "We named this ink 'fading ink'." The reporter was a little unconvinced and prepared to conduct an experiment to verify Professor Dong's ink.
The reporter prepared three types of paper: printing paper, letter paper and newspaper. First, the reporter used fadeable ink, ordinary watercolor pens and watercolor paints to write and draw on the printing paper, and then used a flower-watering sprinkler to spray water on it. In less than a minute, you can clearly see that the words written with fadeable ink have changed significantly. The color has faded a lot, but it will take some time to disappear. Then, the reporter wrote on letterhead and newspapers. However, what was written on the letter paper has not been erased. Professor Dong explained: "Because the fibers used to make various papers are different, and the degree of penetration of this ink into various papers is also different, so the fibers of this letter paper The penetration of the ink is very strong, so it takes a long time. "Then we looked at the newspaper, and the result was beyond our expectations. The words on the newspaper disappeared as soon as they were wet. Looking at the three pieces of paper together again, the words written with Professor Dong's ink are almost invisible, but there are still some traces.
To this end, Professor Dong invented another kind of paper. In fact, there is nothing special about this kind of paper. It is just ordinary paper covered with a layer of plastic film. Use fadeable ink to write on it, and after wiping it with a damp cloth, there are no traces at all, and the traces on the cloth are gone after gentle rubbing.
Although this kind of ink can improve the utilization rate of waste paper, it will disappear if it touches water, which is not good if it is exam paper. To perfect this ink, Professor Dong invented an ink that could be dissolved in boiling water. Later, the reporter started another experiment.
On a table, there are two pots that are being heated. After the water boils, the reporter puts ordinary printed printing paper in one pot and puts in the other pot Paper written with ink invented by Professor Dong. The water temperature slowly rises. When the water temperature reaches 50℃, you can see that the ink characters have disappeared and the water has not changed, but the ordinary printing paper has no change.
It’s really amazing! I hope that this kind of ink can be widely used in our daily lives in the future, greatly reducing the waste of paper.