Scientific topic composition

No matter in school or in society, everyone will be exposed to composition to some extent. According to the characteristics of writing proposition, composition can be divided into propositional composition and non-propositional composition. Still at a loss for composition? The following are nine short articles on scientific topics that I collected for you. Welcome to share.

Scientific topic composition 1 just arrived in the classroom, hey! Why are there new teachers? It turns out that she is our new science teacher-Miss Wang.

Ding, ding "the bell rang. I saw two more tables on the podium with some strange experimental equipment on them. Then the teacher gives each group a bottle of cold water, a bottle of hot water, a balloon and a beaker. The teacher talked about the precautions and the exam began. Suddenly, a pot exploded in the classroom, and the students all began to do experiments excitedly.

I picked up the beaker and asked Liu Yitong to help me put the balloon mouth on the beaker. Then I picked it up and put it in hot water. After about 5 or 6 seconds, the balloon on the beaker actually bulged a little. After a while, the balloon miraculously stood up, like a mighty soldier. Put the beaker in cold water, but the balloon lowered its head slowly and dejectedly like a child who didn't eat enough. "wow! It's amazing! It's so fun! " Li Haiduo shouted. This shocked the whole class and many people flocked to watch it.

Later, a group of us put a squashed empty mineral water bottle with a lid into hot water, and only heard a "gab". The bottle swelled in hot water, which startled us. Put it back in cold water, the bottle looks like a magical magician, and a "gab" is restored to its original appearance.

This is really interesting! What causes balloons and mineral water bottles to swell? It turns out that in a closed object, the air inside will expand when heated, so balloons and mineral water bottles will expand when put into hot water, which is why they expand when heated and contract when cooled.

Nature is really full of miracles, and we expect that future science classes will enable us to discover more wonderful and interesting phenomena and understand more scientific principles.

This science class is really interesting!

As early as the May 4th Movement, pioneers shouted the declaration of "advocating science and opposing ignorance". From a realistic point of view, economic prosperity cannot automatically stop the spread of ignorance and superstition. It is still a long way to go to improve the scientific and cultural quality of the people and fight ignorance. To improve the public's scientific literacy and form a good fashion of "being proud of advocating science and being ashamed of ignorance" requires the joint efforts of the whole society. For example, scientists should adhere to the scientific spirit, abide by scientific ethics, and maintain the seriousness, rigor and standardization of science. Take a serious study and scientific verification attitude towards the hypothesis that has not been scientifically proved; We must resolutely oppose acts of violating basic scientific facts and laws, practicing fraud, and marching around the city in the name of "science." As leading cadres and management workers, we should clearly adhere to scientific truth, support scientific experiments and free discussion of scientific issues, and support the struggle against superstition, ignorance and pseudo-scientific activities. As news publishing and mass media workers, we should guide the broad masses to choose a healthy, civilized and scientific lifestyle, rather than providing a carrier for the spread of ignorance and so on.

According to the Survey Report on the Current Situation of Popular Science in China completed by experts from Chinese Academy of Sciences and other institutions last year, at present, two people in China 1 are superstitious about seeking visas; Of the 4 people, 1 person is superstitious about constellations; Of the five people, 1 is superstitious about Duke Zhou. In 20xx, the proportion of China public's scientific literacy to individual literacy was only 1. 98% of the 50 people in China have only a basic scientific literacy, which is about twenty or thirty years behind the developed countries.

Proud of advocating science and ashamed of ignorance. Scientific progress is a great source of social progress, and the modernization of a country must first be the modernization of science and technology. The five transfers of the world economic center are all driven by the transfer of science and technology centers without exception. A nation that advocates science is bound to be a nation that is constantly improving and full of vigor and vitality. The more our country develops, the more we should attach great importance to the coordinated development of social science and natural science, widely spread scientific knowledge, scientific methods, scientific ideas and scientific spirit in the whole society, and further form a good social fashion of stressing, loving, learning and using science.

Scientific topic composition 3 to write this kind of article well, you must have a preliminary understanding of the state of modern science and technology and the basic situation of the scientific and technological revolution in the contemporary world; Basic understanding of the challenges brought to us by contemporary scientific and technological progress; At the same time, we should master some specific and convincing materials. Only in this way can we link learning, mastering and applying science and technology with personal mission, the future of the motherland and the destiny of mankind, and write high-quality articles.

You can expand your thinking from the following aspects and choose a suitable writing point.

Science has created enormous material wealth, greatly improved human living conditions and improved the quality and level of human life. The achievements of human beings in housing, transportation, diet, clothing, culture and health are all brought about by scientific and technological progress. Of course, if we look at the problem dialectically. We can also talk about the dual impact of contemporary scientific and technological revolution on human beings from the perspective of advantages and disadvantages, that is, what people usually say is that science is a sharp double-edged sword. Science not only brings benefits to mankind, but also brings disadvantages to mankind. Therefore, the question of how human beings should seek advantages and avoid disadvantages has become a topic that can be involved in writing. However, it should be clear that the mainstream of scientific and technological progress benefiting mankind will not change.

The wave of scientific and technological revolution in the contemporary world is surging, which has greatly promoted the economic and social development. A great scientific era has arrived. The times call for scientific and technological progress, and the times require all members of society to improve their scientific understanding. No matter which country wants to catch up with the pace of the world scientific and technological revolution, it must hold high the banner of carrying forward science. There are at least several topics worth writing to promote science: first, relying on science to participate in international competition; Second, dedication to the cause of science; Third, the struggle against feudal superstition; Fourth, vigorously popularize science and technology.

Nowadays, the competition among countries in the world is not only the competition of comprehensive national strength, but also the competition of science and technology, and the decisive factor of scientific and technological advantages is the strength of scientific and technological talents, so the key to developing science and technology is talents. In the contemporary scientific and technological revolution in the world, professionals with advanced scientific knowledge have become the targets of competition not only among countries in the world, but also among domestic departments. How to win in the fierce competition is a serious task before us. Respecting talents, retaining talents and cultivating talents have become hot topics with different opinions.

Science and technology are pushing the whole world forward at an alarming rate. What the future world will look like has become a hot topic of widespread concern. Many social scientists and natural scientists have discussed this problem a lot. It is relatively easy to write sci-fi narrative articles on such topics. If you write sci-fi works, you need to master some scientific and technological knowledge, but also have a reasonable imagination and connection to avoid fabricating some bizarre plots.

It's sultry today. In the afternoon, my parents and I went shopping at a discount and took a taxi home. When I got on the bus, the air conditioner was on, and the weather was cool. When we get home, it's time to get off. As soon as I got off the bus, I saw my father's glasses "sweating" and foggy, just like a layer of white gauze. Dad said he couldn't see anything, so he took off his glasses, wiped them under his clothes and put them on again.

I think it's strange that my father's glasses can still be seen clearly in the car. Why does he get foggy when he gets off the bus and can't see anything clearly? I asked my father what was going on. Dad said to take me home to do an experiment, and I would know the answer after the experiment.

After dinner in the evening, I urged my father to take me to do the experiment quickly. He first asked me to prepare the materials for the experiment: a glass, some ice cubes and a glass of water. It's too simple. I got the materials ready in less than a minute. I have six ice cubes. Then, I began to do experiments:

I put the ice cubes in the cup first, and then pour some water into the cup. Dad asked me to look at the glass carefully to see what would happen. I sat on the sofa and stared at the glass with my eyes wide open. After a while, I found it was foggy and sweaty outside the glass. The ice in the cup slowly melts, and more and more "sweat" appears outside the cup. Finally, after a few minutes, the whole outside of the glass was wet and the water in the glass could not be seen clearly. I think the water in the cup is so cold, and the outside of the cup has been sweating. Why?

Looking at my strange appearance, my father finally told me the answer. Because the temperature outside the glass is very high, the water vapor in the air will adhere to the outside of the glass and condense into water droplets when it meets the cold glass, so we "sweat" when we see the glass.

Now, I know why my father's glasses "sweated" when he got off the bus! Because of the high temperature outside the car and the cold inside, when dad got off the bus, the water vapor in the air attached to his cool glasses and condensed into water droplets, so the glasses "sweated"!

I am so happy that I finally understand this scientific truth!

In the fifth grade of primary school, there are more and more students wearing glasses in our class. To this end, Miss Li was very anxious, so she held a seminar in her class, asking everyone to express their views on the issue of "scientific use of eyes"

The seminar began and the students were in full swing. Some students introduced the causes of myopia, some students talked about the troubles after wearing glasses, and some students talked about the good methods to prevent myopia.

Xu Ruijing said: "Eat more fruits and vegetables, eat more things containing vitamin C, and don't be picky about food." Also pay attention to a reasonable diet and maintain a balanced nutrition. "

Wuyue said: "When reading and writing, the light should be moderate. Too dark light is easy to make eyes nervous and feel tired, which is very harmful to eyes in weak light. Soft lighting is recommended to provide contrast between light and shade. "

"TVs, computers and mobile phones all have radiation, so try to avoid contact." Li Xinyu said excitedly.

"When reading and writing, the posture should be correct, not more than an hour, don't hunch over, or read at your desk, and you can't lie on the bed and read sideways. The distance between eyes and books should be kept at 30-35cm, the distance between body and textbooks should be about10cm, and the included angle between books and desks should be kept at 30-45cm. " Du Haoze hurriedly added.

Liu Yu said: "If you feel tired after finishing your homework, you can roll your eyes or look at the trees in the distance outside the window. The nervous nerves will feel relaxed and the fatigue of your eyes will disappear."

……

Teacher Li said, "Everyone talked very well. In the future, we must use our eyes scientifically and protect the eyes as the window of the soul. "

Do you know toothpicks? Do you know how toothpicks let us know about science? Only use your own observation and courage to do the experiment. Do you know balloons? Do you know static electricity? Next I will take you to discover the mystery of static electricity.

The experiment began. Let's prepare tools, toothpicks, water, sugar cubes and soap. Step 1: Carefully put the toothpick on the water. Step 2: Put the sugar cubes in a basin away from toothpicks. The toothpick will move towards the sugar cube. Step 3: Put the soap in the water and keep the toothpick away from the soap.

The next experiment begins. Tools are 2 inflatable balloons, 1 string, 1 piece of cardboard. Step 1: Inflate two balloons separately and tie a knot in your mouth. Step 2: Connect two balloons with a thread. Step 3: Erase static electricity. Step 4: Separate the two balloons. Step 5: put the cardboard between two balloons, and the electricity on the balloons makes them attracted to the cardboard.

Why? Because of static electricity. The electricity on one balloon repels the electricity on the other balloon. The electricity on the two balloons attracts them to the cardboard.

When you put the cube in the center of the basin, it will absorb some water, so there will be a small water flow in the direction of the cube, and the toothpick will move with the water flow. However, when you put soap into the basin, the surface tension at the edge of the basin is strong, so you will pull the toothpick out.

Thank you for doing the experiment with me.

I like science very much since I was a child.

Science can invent multifunctional chopsticks. This pair of chopsticks is empty in the middle. As long as the head and tail are pulled apart, it becomes a straw and can be used to drink water. There are four buttons on it Press the first button, the chopstick head will immediately become a knife, which can be used to cut things. Press the second button to become a fork, which can be used to eat noodles; Press the third button to become a spoon, which can be used to drink soup; Press the fourth key to change back to the original chopsticks, which can be used for eating.

Science can invent magic shoes. Shoes are automatically controlled by the bioelectric current of the human body. When the brain sends a signal to direct the foot to move in which direction, the bioelectric current of the brain is quickly transmitted to the foot through the nervous system. These shoes don't need to consume other energy. It can store the energy that the wearer usually walks, and it will be released once needed. You should loosen your shoelaces when you don't wear them at ordinary times, so it is no different from ordinary shoes. When you need it to run fast, just tie your shoelaces, and it becomes a veritable magic shoe.

Science can invent smart dustbins. It can distinguish different colors and different materials. It has a rectangular mouth with a red button at the top and four trash cans below. If you throw the slider into the big mouth of the smart trash can and press the red button, the box will make a rustling sound, that is, it is automatically sorting garbage. If it is ordinary garbage, it will fall into the first trash can. If it is plastic garbage, it will fall into the second trash can, if it is metal garbage, it will fall into the third trash can, and if it is dangerous garbage, it will automatically fall into the fourth trash can. People recycle according to the classified garbage, and plastic garbage can be recycled after treatment; Metal scrap can also be re-made into products; Hazardous waste can be changed from harmful to harmless through biochemical treatment.

Although these objects have not yet been made, I believe they will be made in the future. This is the wisdom that science brings to mankind.

On the way to my mother-in-law's house, my mother told me about her young days.

My mother-in-law has suffered all her life. She just dropped out of primary school. A brother and a younger brother have to go to school. My sister is too young. My grandmother was ill in bed at that time. The burden of the whole family is borne by the mother-in-law, selling tea eggs, carrying big bags and planting crops, revealing the bitterness that is not commensurate with age.

Nowadays, the old people can't eat well and live well when they were young, and now they covet the present life. Mother-in-law said that during the three-year natural disaster, the leaves on the trees and the weeds on the ground were eaten up by people. If you really can't find anything to eat, you can eat a kind of red soil to fill your stomach, but after eating it, your stomach will be swollen and you can't digest it.

At that time, we didn't understand.

When I was eating at my mother-in-law's house, I couldn't help thinking of those difficult years she had gone through. I couldn't help putting two pieces of bacon in my mother-in-law's bowl. The mother-in-law smiled, her eyes filled with happiness, and buried the chopsticks in her mouth.

Mother took another piece of meat from her mother-in-law's bowl with chopsticks and put it back on the plate. Mother-in-law didn't speak, just looked at her mother silently. I'm a little unhappy. As soon as I was immersed in my filial piety, I was swept away by my mother's chopsticks: "Mom, what are you doing!" " ""Your mother-in-law has eaten some meat dishes, so she can't eat more at night. "

I don't understand: "So what? My mother-in-law suffered so much when she was young. Is it wrong to eat more meat now? " My mother is a medical student, and she doesn't buy my account in this respect: "My mother-in-law has hyperlipidemia and high blood viscosity. If she eats meat dishes, she can't metabolize them well. These oils will accumulate in her blood vessels, and her blood will not flow smoothly. This is science. "

My mother-in-law smiled and said to me, "My mother-in-law knows that you are kind, but your mother is right. She is also good for me, for my health. My mother-in-law can't eat more meat at night. " I nodded, thinking that my mother's statement really made sense, so I buried myself in eating.

Come to think of it, my mother and I both care about my mother-in-law. The so-called humanistic care, I may just stay on the surface, but my mother pays attention to her mother-in-law's health under the guidance of science, which is a heartfelt love for her mother-in-law.

Sometimes, if we only look at the problem from the surface, the consequences may be counterproductive. It is the real meaning to take it seriously and solve it in depth with a scientific attitude. Just as Sister Mary's kindness may enable us to help the suffering people, there is nothing wrong with it. And truly more meaningful nursing can not be separated from scientific guidance. In other words, scientific humanistic care can better improve our quality of life.

Everyone has their own beautiful dreams. Some people want to be archaeologists, some people want to be Microsoft bosses, some people want to be photographers, and some people are quite singers. I want to be scientists.

I want to start my dream when I am four years old. While I was watching TV, an American aircraft carrier X appeared on the TV screen. There are planes, cannons, consoles and submarines on board, which are extremely powerful. I think: if our country also has an aircraft carrier X, it would be great! Adults say that the X carrier was developed by many scientists, and my little heart was attracted by a huge force. A dream seed sprouted quietly in my mind-I want to be a scientist when I grow up!

Since then, I have paid special attention to science and education. If there is a science and education program, I will stare at TV and keep every detail in mind. I learned from TV that the Nimitz aircraft carrier of the United States is the most powerful aircraft carrier in the world at present, with a length of more than 300 meters and a ship width of more than 40 meters. It is propelled by nuclear power and can carry up to 8 1 aircraft. Liaoning ship in China currently ranks third in the world. I also know that China's aircraft carrier is named after the city. When can the aircraft carrier be named after "Henan", how cool it is! In order to further study, I also ordered "Little Copernicus Military Science" and "Crazy Exploration" under the recommendation of my teacher ... Every day after I finish my homework, I will pick up the books and read them with relish. My mother was also very supportive and bought me an assembly boat. I can't put it down every time I buy it. I sit for hours without eating or drinking. I want to assemble successfully, and my hands-on ability has improved a lot during the assembly process.

Dreams are beautiful, but they are also far away. I am still a pupil, and the most important task is to study hard. Listen carefully in class, do homework after class, and read extracurricular books after class, because teachers often say that "opening a book is like opening a world".

I have taken the first step on the road to realize my dream. I firmly believe that as long as I make unremitting efforts towards my dream, my dream will definitely come true!