Writing on the topic of science 1 The snail slowly climbed to the top in the scorching sun. It worked so hard in exchange for a small step closer to its dream. Spiders have no wings, but weave webs in the air by sweat. It is this hard work that has brought a small step closer to the dream; In order to see a golden autumn, the leaves still cling to the branches in the rain. They are so strong and persistent, in exchange for a small step closer to their dreams.
Maybe the flowers on the roadside will laugh at me. Why are you so tired? You're just in vain. In order to invent explosives, Nobel engaged in experiments day and night, which many of his friends thought was futile. But in the end, Nobel succeeded in developing explosives and became a household name. He smiled and told everyone that there will be too many bumps on the road to success, but as long as you firmly believe in your dreams, there is hope.
Maybe birds in the sky will laugh at me. Flying requires talent, but you can't. However, the efforts made the day after tomorrow can not be ignored. When Jay Chou, the most powerful pop singer in China, first arrived at the record company, she was rejected by the teacher because she was not talented and ugly. However, people can't judge a book by its cover, and sea water has no energy. When Jay Chou showed the teacher 50 songs written in a week, everyone was surprised, not only because time was tight, but also because each song was like a professional lyricist. He is like a bird. Although he has no talent, he still tries to fly forward. No matter how tired he is, he knows that the wings of dreams can take him through the night and enjoy the beautiful dawn.
Maybe the clouds in the sky will laugh at me. You are far away from me! When Yao Ming, who just joined the team, knew that many people looked down on him, he said to himself, "Opportunity is fleeting. If you work hard, you may not succeed. If you give up, you will fail. " How can Yao Ming, who has dreamed of basketball players since childhood, give up so easily? Every step is a step, and Yao Ming's efforts make people all over China proud of him.
There will be a lot of joy or hesitation on the way to your dream, but you can't give up easily. If you can go back to the beginning, you will find how confident and strong you were then.
When I was standing at the door of my house, ready to go to my dream, the snail told me to pack my bags and start, because dreams are the best reason; Spider told me that if there is no dream, wings will become a burden; The leaves told me never to give up my dream, and to realize a golden dream with my lifelong persistence.
I told myself that if I have a dream, I will get closer step by step!
Science is actually around us.
In the evening, I take off my clothes and get ready for bed. The strange sound of "wow-ah-ah-hiss" is endless. It turned out to be an electric shock. I touched it six or seven times in a row. But some people say that it is not "electric shock", but static electricity. I thought to myself, "hearing is empty, seeing is believing." What is static electricity?
On Sunday, I struggled to find a story about static electricity. The book says: "If we wear chemical fiber clothes and insulated shoes and move on the insulated ground, the static electricity on our bodies can reach several thousand volts or even tens of thousands of volts." I was so shocked that I couldn't help shivering. Pause and continue to look down. "When people come into contact with metal, electrostatic shock will happen!" Oh, this is the principle of triboelectrification!
So how is static electricity generated? My curiosity and thirst for knowledge are getting stronger and stronger. I have to ask my big cousin for advice. My cousin patiently explained to me: "Static electricity is due to the fact that when different objects touch each other, one object loses some electrons and becomes a positive charge, and these electrons are transferred to another object, making it a negative charge. If the charge is difficult to neutralize in the process of object separation, the charge accumulated on the object will form static electricity. " "Oh, I see. Thank you for your advice. " Then go home and do the experiment with a brush.
Is there any way to eliminate static electricity? I took a dozen cable ties and let them rub to generate static electricity. Because of static electricity, they spread everywhere. I can't think of any clever tricks at the moment. I will touch the mouse with a blind cat. Touch it! I put it next to the lighted candle, and a miracle appeared. The loose bandages hung down slowly and gathered together. "Hey? What the hell is going on here? " I've thought about it over and over again, but I can't come to a conclusion.
In order to get the answer, I had to ask my learned sister for help again. Sister said: "flame is used to eliminate static electricity, because flame can ionize air molecules into positive ions, negative ions and electrons." The negative charge of the bandage is neutralized by the positive ions brought by the flame. " I was in a daze. But anyway, I added a little knowledge-flame can eliminate static electricity.
This day, the harvest is really not small! I secretly said to the static electricity in my heart, "hey, the original flame is your natural enemy!" I'm not afraid of you now. It's easy to deal with you, hahaha! " Ah! There are so many interesting sciences around us. My thirst for knowledge is growing, and science is wonderful!
We live in 2 1 century, and the wheel of history is rolling forward rapidly. Advanced technology has created our beautiful life today.
With the development of the times, the wisdom and truth left by countless sages, as well as people's continuous exploration and discovery and innovation, the pace of mankind is striding forward!
The invention of the automobile has undoubtedly greatly facilitated our travel and brought a lot of convenience. Aviation, ferry, train and other undertakings are developing day by day; Amazing achievements in agriculture; The objects and machines in the family room are constantly humanized, and many inventions have laid a good foundation for our lives. Computer is a cross-century creation, and our life is inseparable from it, and we rely on it more and more. Computers can easily help us manipulate many things, accurately calculate the data we want, and meet our needs in many aspects ... The endless thirst for knowledge drives us to face all mysteries fearlessly. Focus on the distant unknown universe and focus on the endless unknown.
God has given us wisdom and is destined for us to explore. The word science and technology is created by human beings and is destined to bring us a bright future! However, with the changes of the times and the progress of science and technology, the pure land on which we live-the earth has been destroyed. Science and technology have brought us beauty and new problems. Cars are the means of transportation commonly used by human beings today, but they need a lot of gasoline supply. The riding of cars, uncontrolled mining of minerals, and continuous felling of trees have left the earth devastated. The greenhouse effect is spreading around the world, which makes the weather extremely hot, the snow-capped mountains begin to melt, and the beautiful scenery is quietly leaving us. ...
Isn't all this thanks to us humans? While pursuing a bright future, we should first protect our homeland. Instead of ignoring the consequences, we will use all means to achieve higher living needs. If you destroy your home, everything you have done will not end up drawing water with a sieve.
God gave us this home to protect him. The development and creation of science and technology make our life better. At the same time, we should use our own technology to protect our home, make it brilliant and become a shining star in the universe!
There are 40,000 worlds with the theme of science, and there are no surprises. In class today, Teacher Lin said, "Did you hear me say' paper buds blossom'?"
After a while, everyone gave a chorus of "hmm". "Today, I will take you to do an interesting experiment. The name of the experiment is' paper bud flowering'. " The teacher picked up the schoolbag, took out a bag of watercolor pens from the schoolbag and took out a piece of paper in the shape of flowers. Then he took out a blue marker from his watercolor pen bag and drew his favorite color on the paper with the pen, and the paper bud was ready. Then the teacher folded the petals.
"In the future, everyone will gather here to watch." The teacher picked up a basin of water and put it on the platform, and the students flocked to the platform like a flood.
"Now I put the flowers on the water and put them smoothly." The teacher said seriously.
There was silence in the classroom, and all the students stretched out their necks like geese, staring at the water unblinkingly. That bud is like a little girl who just woke up from sleep. It stretched out first, stretching out one petal, then another, and soon spread out. It looked at us curiously and stared at it.
"Do you want to experience this experiment?" The teacher said.
"think!" We say.
"I'm ready for you." The teacher said mysteriously.
Everyone got a paper bud painted with pigment. As soon as I got the paper bud, I couldn't wait to fold it.
The teacher said, "Let's put the paper buds in the water together."
We did as we were told, and as soon as the paper buds entered the water, they rushed to bloom. They walked up bit by bit, looked up curiously, and then looked around slowly, as if they felt very fresh about everything around them. Those colorful flowers compete with each other and have the momentum of "spring can't close the garden". It took about a cup of tea, and all the paper buds showed charming smiling faces. These paper flowers are like a little girl lying lazily on the water.
In fact, this experiment is a physical phenomenon. The main component of paper is plant fibers, which are tiny capillaries. After the paper meets water, the water rises along the capillaries in it, making the fiber full, so the original folded petals open.
We suddenly realized that life is full of science!
Today, as soon as we got to the classroom, we began to have classes. But this class is really special! It turned out that Mr. Wang had two cups and a small piece of paper in his hand and said, "We are going to do an experiment today!" " "Experiment!" We cheered. After that, Mr. Wang began to do experiments.
The experiment began. Some students stood on the bench, some ran to Miss Wang, and even stood on the table! We saw that Mr. Wang poured a jar of water into the cup and buckled the paper on the mouth of the cup. Then cover the mouth of the cup with your left hand, press hard, and then cover the bottom of the cup with your right hand. Then I turned the cup over and moved my hand slowly. At this point, my heart is in my throat. I thought to myself: can this succeed? Everyone held their breath and waited for Miss Wang's "achievement". At this time, it seems that you can hear the sound of a needle falling to the ground. Suddenly, Mr. Wang let go of his left hand, and the piece of paper was washed down with a "wow" sound, and the water splashed all over the floor, and everyone burst into laughter. It turns out that Mr. Wang's paper is too small to cover the mouth of the cup, so air flows in, and the air inside and outside cancel each other out and disappear. However, Mr. Wang didn't lose heart and continued to do the experiment. Teacher Wang took another piece of paper, the same as before, but failed again this time. We laughed again. The teacher took another piece of paper, pressed it on the cup filled with water and turned it over. "Ah," we shouted. It turns out that teacher Wang succeeded. She held the cup high, and after a while, she put it down again and asked, "Why didn't the paper fall?" Later, the teacher called Zhang, and Zhang said, "Because when the paper is pressed on the cup, the air doesn't take up the position, so the paper won't fall." Teacher Wang said, "No, it's because there are things around us that are invisible and intangible. Its power is greater than water, and it is atmospheric pressure. Because we fill a cup with water, air can't get in, and then put a piece of paper on it without leaving a gap. On the contrary, the paper will not fall off. But if the water is not full, buckle a small piece of paper and the paper will be washed down. This is my second experiment. " "Oh!" We suddenly realized.
Through this experiment, I benefited a lot and learned the mysteries of nature.
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 been made, I believe they will be made in the future world. This is the wisdom that science brings to mankind.
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!
Gorky, the author of composition 8 with the theme of science, said: books are the ladder of human progress. Yes! Books are the nourishment of our whole world, which can make us grow and progress. There is a good book in each of us, and Madame Curie is one of them in my eyes.
The author of Madame Curie is Eve Curie, who is Madame Curie's daughter. This book is written around Madame Curie's life.
Madame Curie's full name is Maria Rodovska Curie, 1867+ 165438 10 was born in Warsaw, Poland on October 7th. She is a French physicist and chemist. As a world-famous scientist, she studied the radioactive phenomenon and discovered two natural elements, lightning and polonium. People affectionately call her "the mother of thunder" and she won the Nobel Prize twice in her life. In the process of studying Lei, it took her and her husband three years and nine months to extract 0 from tons of slag. 1 clay. But in middle age, Madame Curie's husband pierre curie (a great scientist) died unfortunately. As an outstanding scientist, Madame Curie has a lot of social influence that science does not have, especially as a pioneer of successful women, so her example has inspired many people.
In Madame Curie's glorious life, what moved me most was1April 9, 906, when pierre curie was unfortunately run over by a carriage. Madame Curie was very sad at that time, but he declined the state pension from the French government. After that, she still devoted herself to the scientific career she loved. I believe that time was the most painful time for Madame Curie.
Madame Curie's contribution goes far beyond this. Madame Curie told us that we should have the heart to love and serve the motherland and create our own world on our own. She persisted in difficulties and told us not to shrink back in the face of difficulties; She regards reputation as a cloud and money as dirt, telling us not to value money and reputation. Her education method is also perfect, and her eldest daughter Linda Curie also won the Nobel Prize. In her eyes, science is everything, and he can give his life for science (Madame Curie suffered from pernicious anemia while studying lightning). Madame Curie is such a "science enthusiast".
Writing on the topic of science 9 Scientific observation exercises These days we are studying the text about "observation", and I am very interested. So I decided to do an observation experiment myself-"Eggs soaked in vinegar".
I prepared a transparent glass, a raw egg and a bottle of white vinegar first. Then I gently put the eggs in the glass and slowly poured the white vinegar into the glass until the eggs were submerged by the white vinegar. At the same time, I stared at the eggs soaked in vinegar, and the eggshell was immediately surrounded by dense small bubbles. The bubbles keep rising and making a hissing sound. I touched the eggshell with my hand, and my fingers were numb slightly, just like the feeling of drinking coke. After a while, the egg covered with silver bubbles floated like a shy little girl. I pressed the egg hard, but as soon as I let go, the naughty egg floated again. I'm surprised: why do eggs bubble? Why did it float up? Is the small bubble on the egg acting as a lifebuoy?
When I looked at it the next day, I found that the eggs had gained a lot of weight and there were fewer and fewer bubbles around them. Eggs take off their brown-red coats and put on white shirts, like white pebbles on the beach. At the same time, there is a layer of brown mucosa in the cup, and a layer of white foam is formed on the mouth of the cup.
On the third day, the eggs changed again and the bubbles were almost gone. I tapped a few eggs with my forefinger, and the shell felt soft and tender, just like a bouncy ball.
On the fourth day, I found that the eggshell became transparent, and I could vaguely see the yolk inside. I couldn't help but be curious and gently fished up the egg, but because I was too nervous, the naughty egg fell to the ground. But it brought an amazing discovery: the "coat" wrapped in egg white and egg yolk cracked a big hole, and the egg white flowed out, but the egg yolk hardened, like wearing a thick coat.
Finally, I looked it up on the Internet and finally understood that when vinegar soaked eggs, calcium carbonate in eggshells reacted with acetic acid in vinegar to generate carbon dioxide gas, and eggshells were dissolved by acetic acid, so eggshells became soft.
There are many interesting and magical things in the world, but they all hide like elves. If you look carefully and think carefully, you will find them.
Writing on the topic of science 10 Life is progressing and cities are prospering, which are inseparable from the benefits brought by science and technology. In life, there are also many things around us that have been changed by learning.
One day when I was a child, I took a bath at home. The bathtub is full of water, and I am comfortable in it, humming a tune. Just when I was happy, a drop of cold water suddenly landed on my nose and scared me. What happened? I looked up at the ceiling and found that there were many small drops of water lined up, and a few drops were falling. I didn't understand what was going on, so I went to consult my mother. My mother said: "The water drops on the ceiling are the water vapor emitted from the bathtub. When the ceiling is cold, it will condense, and the surface of the ceiling is very smooth, so it will gather more and more, and it will fall down at a certain time." "Oh, I see." It suddenly dawned on me that another idea flashed through my mind: dripping water on the ceiling would make swimmers feel uncomfortable. How can I keep the ceiling from dripping?
As soon as I turn my head-if the ceiling of the bathroom is arched, the water droplets formed on the ceiling will flow down along the arch, and then a small sink will be made at the bottom of the arch to connect with the sewer, which can completely prevent the water droplets from falling off the ceiling during bathing. Yes, let's do it.
In the evening, I told my mother this idea. My mother said, "shall I take you to the sauna today?" "But I have washed it. Tomorrow? " "No, go today. You will understand when you go. " I didn't know what was in my mother's gourd, so I had to follow her, but when I got to the sauna center, I understood, because the ceiling there was arched and the water drops on it flowed down the beautiful dome. I scratched my head and smiled and said, "I see." My mother patted me on the shoulder and said, "Smart! This is the science around us. Scientific principles are everywhere in our lives and are closely related to our lives, so you should study hard, master more knowledge and meet new challenges. "
As long as we observe carefully, think more and pay attention to life, we can learn a lot of scientific knowledge and broaden our horizons.
Writing on scientific topics 1 1 I have always felt that the world is wonderful and I am curious about many things and phenomena. For example, what does the tree "breathe"? Why do people fly away as soon as they get close to flies ... then they go to school, and now a lot of knowledge that they didn't understand before is slowly understood. In science class, I know that the "small nose" of a tree is its leaves, and the tree breathes on the leaves. In extracurricular books, I learned that flies can observe 360 degrees, so they can detect the smallest activities around them as quickly as possible. So when people get close, it will fly away immediately ... But there are still many phenomena around me that make me curious.
One day, I finished my homework and went to the balcony to see some goldfish raised by my grandfather. I brought fish food to feed the small fish, and then I lay down in front of the fish tank to watch the small fish eat. Suddenly I found out that the goldfish I saw in the water through the fish tank was much bigger than the goldfish I just saw through the water. So, I stood up again to see the fish through the water, and the little goldfish became smaller again. I was shocked and shouted, "Mom, no, the little fish has become a Transformers!" " "My mother heard me crying and ran to see it. I said to my mother anxiously, "Fish will get bigger and smaller. "After listening to my story, my mother smiled and said to me," It's not that small fish will get bigger and smaller, but that light is becoming a magical magic! ""I became more curious and asked, "How can light do magic?" So my mother found the encyclopedia and turned to the page about light. I couldn't wait to pick up the book and read it. After reading the book, I finally understand that it is really not the small goldfish that will become bigger and smaller, but the principle of light refraction: when light hits from one medium to another, the propagation direction of light changes at the interface, and some light enters the second medium. This phenomenon is called light refraction. I also learned from books that light can become other "magic". For example, when I look in the mirror, I hold it in my right hand, while when I look in the mirror, I hold it in my left hand. This is the principle of light reflection. Light can also do a lot of magic!
If there is no science in life, there will be no fun, no exploration and pursuit; The world is full of mystery, full of magic ... science is like the key to solve the mystery, and all questions need to be answered without it. We need to keep exploring in the future study in order to know more scientific mysteries.
During the summer vacation, my father took me swimming in the Olympic Sports Center. When I came to the swimming pool, I took off my underwear and went swimming. I swim happily. Suddenly I felt a little pain in my ear, but I felt that it was nothing serious, so I endured it and swam down for a while. Oh, no, my ear hurts again and I don't want to surface. So I asked my father, "Dad, why do I feel my ears hurt when I swim?" Dad told me, "Maybe you dive a little deep. The pressure of the water is too great for your ears, so it hurts."
So I became curious about the pressure of water and wanted to know what determines the pressure. When I got home, I flipped through "100,000 Why", and there were too few things written on it to understand. I looked up the information on the Internet and learned that the pressure of water is determined by its depth. The deeper the water, the greater the pressure, and the shallower the water, the less the pressure.
To this end, I did an experiment. The materials are: 1 rectangular vertical carton filled with milk, 1 rolled tape, 1 nail, 1 flat plate.
I put away the milk carton and poked three holes in both sides with nails. The positions of the three holes are bottom, middle and upper respectively. Then seal the three holes with adhesive tape, fill the carton with water, put the flat plate under the perforated side and tear off the adhesive tape. Do you know what happened? Is there a difference between three-hole water spraying? Of course not. The water from the bottom is sprayed farthest, followed by the water in the middle, and the water from the top is sprayed closest. This proves that the pressure of water varies with the depth of water. The deeper the water, the greater the pressure, and the shallower the water, the less the pressure. Therefore, the depth of my swimming pool is different, and the pressure felt by my ears is different.
In order to know what other factors are related to stress, I did another small experiment: I inserted a straw into the mouth of a small paper box and plugged it tightly. Then I use a straw to add water to the carton. When the water reached the suction pipe, the bottom of the small carton cracked. After many experiments, the results are the same. It turns out that water pressure is also related to weight. Because the bottom of the carton bears the maximum weight of water, the water pressure is the greatest, so the bottom of the carton cracks.
Pressure is everywhere, including water pressure and atmospheric pressure, which are closely related to our lives. The pressure is far away and close at hand!