Science is everywhere, composition
Science is everywhere. Composition 1 "put the balloon here and tie the rubber band, right, ok!" You are finished! " I'm talking to myself. What? Originally, I was going to make a "weather forecast bottle". I saw this small production in a book, which is simple and can know the temperature change of the day. Why not give it a try? So I prepared the materials and started making them!
I took out a glass bottle containing milk, balloon scissors, rubber band, adhesive tape, cardboard, crayons and straws and put them on the table. Spread out the book and I began to follow it.
I'll finish the milk first, wash the bottle, tear off the package, and then unscrew the bottle cap and put it aside. Then I cut the balloon in half horizontally, and it took a lot of effort to put the upper part of the balloon on the bottle mouth, pulling it left and right to keep the middle of the balloon from sinking, and then tying the rubber band tightly. A bottle sealed by a balloon is like a closed air warehouse. According to the book, this is the main part of the meteorological instrument-a closed air storage chamber. Now, I will put a straw in the middle of the balloon.
Almost finished, I drew three lines on the cardboard with a colored pen: write the same next to the line parallel to the straw, write the temperature increase next to the line above the straw, and write the temperature decrease next to the line below the straw. Finally, put the cardboard vertically on the back of the bottle.
Finally finished!
In order to see if the experiment is really effective, I will leave for a while and come back later to see if there is any change. When I left, the straw pointed to "unchanged"
It's too cold today. I'll put on my gloves quickly. 10 minutes later, I went back to my room and found that the straw really pointed to "cooling down"! It seems that this "weather forecast bottle" is really useful! But I can't figure out why. After finding the answer in the book, I suddenly realized.
Although air comes and goes without a trace, it also has weight. The weight of air borne by the surface of an object is atmospheric pressure. Air pressure is closely related to weather conditions. Meteorologists have summed up a rule-areas with high ground air pressure are often sunny, and areas with low air pressure are often rainy. Therefore, on a sunny day, if the outside air pressure is greater than that of the bottle, the balloon rubber mold at the bottle mouth will be compressed and sunken downwards, which will drive the straw to tilt upwards and point to "heating up". On rainy days, the outside air pressure is less than the air pressure in the bottle, the rubber mold at the bottle mouth protrudes upward, and the straw will point to "cooling".
After reading it, I finally understood the truth. This popular science production not only let me know the weather accurately, but also let me know a little about popular science.
It turns out that science is not only high-tech, but also small inventions and ideas. In fact, from a piece of paper to a spaceship, science is everywhere around us.
This is science, and this is the science around us. Science is everywhere.
Science is everywhere. 2. science Everyone must have heard of this term. For our life, science is everywhere. Today, I will tell you a popular science story around me!
That day, I played outside, went home, took a sorbet and ate while having fun. Suddenly, I saw a strange piece of glass, picked it up and looked at the mung bean on the sorbet. The result gave me a big fright. That mung bean seems to be a big ball! I quickly threw away the cup for fear that there was a "ghost" in it. But after waiting for a long time, the "ghost" didn't come out. I picked up the glass and looked at many objects, and found that the images of the objects were magnified many times. I saw a pair of glasses again. I picked them up and wanted to see if the effect was the same as this glass piece. As a result, when I saw it, it was a big ball, which scared me a lot. The image of that ball is as small as a mung bean! It suddenly occurred to me that I didn't enlarge or reduce the image of the object when I looked in the mirror! I ran to the mirror and looked. Sure enough, my image shows no signs of enlargement or reduction. Gee, why are these three situations so different? Why don't the images we usually see in the mirror expand or shrink? Why do glasses reduce the image of an object? Why does that small piece of glass make the image of the object bigger? Numerous questions came to my mind, and I immediately searched the internet for information.
The original mirror that can shrink an object is called a concave lens, which diverges light. A mirror that magnifies an object is called a convex lens, which can converge light. The mirror we usually use to look in the mirror is called a flat mirror, which is basically the same size as the original object. Our eyes are actually a convex lens. Plane mirror, convex lens and concave lens are three kinds of virtual images, all of which are upright; The real images formed by concave lenses and convex lenses are all inverted without exception. Of course, concave lenses and convex lenses can also form virtual images, and the two virtual images they form are also upright. The structures of concave lenses and convex lenses are also different. A convex lens is composed of a transparent mirror, and both sides of the mirror are ground into spheres. A convex lens consists of a transparent mirror, both sides of which are ground into concave spheres. Unexpectedly, they are so magical! Little body, behind it lies the truth!
Knowing this information, I feel that although the mirror is different, the essence is still the same. Later, I also tried to put the convex lens and concave lens together, and it felt as if I had directly brought the distant things closer! So this is the basic telescope, the basic body of galileo telescope! I accidentally built a telescope!
Science is so magical that our life is even more magical. Now, our school has a "maker" space about science. Do you want to come too?
Science is everywhere. On Sunday, my mother will cook a dish by herself. When cooking, she needs broken egg yolk slurry. So I went to get eggs for my mother.
I watched my mother knock on the table with an egg, and the shell was broken. I wonder: why do you have to knock on the table with eggs? Just pinch it by hand, save trouble!
In order to prove that my idea is correct, I asked my mother. I think my mother knows everything. But my approval was refuted by my mother, who said that eggs should not be pressed by hand. I don't think so.
No, I took an egg and thought I could crush it with a pinch. But later, I had to admit that my mother was right. I tried my best, but I still couldn't succeed. The egg still didn't "break".
Afterwards, I rummaged through the encyclopedia with this question, and finally got the answer that is a difficult problem in my opinion. It turns out that when we are pinching an egg, the strength of our hands is scattered to all parts of the egg, which is not enough to crush it. People also use this principle to make arch bridges, because arch bridges are the most stable in the modeling kingdom. Although such a bridge looks thin, the traffic has been run over and it still stands after the storm. Zhao Zhouqiao, for example, has been standing for thousands of years, bending down and staring at the rolling river flowing far away, escorting many troops across the other side. People also build arches and design cars, planes and helmets. So the arch has brought more and more benefits to people.
One egg can't be crushed, but have you tried pressing two eggs with one hand? You must think that one egg can't be crushed, let alone two. Actually, it doesn't take much effort to crush them. Why is this? In fact, when we pinch two eggs in one hand, the strength of our hands is concentrated on the contact point of the two eggs. Because the contact point is the stress point and the area is very small, the egg is broken at once. Not to mention pinching two eggs, even two walnuts in one hand can be crushed. This is the same principle.
It turns out that there are so many knowledge points in nature that science is everywhere! If you want to know more about science, observe it carefully. In order not to regret tomorrow, hurry up and get the jewels back!
Science is everywhere. Today, the sun is shining, and everyone's heart is full of happy atmosphere. The second class in the afternoon is undoubtedly our happiest moment, because at this time, our school will welcome brothers and sisters, uncles and aunts from the Science and Technology Museum to perform scientific sketches for us. Go ahead, look.
The performance has already started. A sister played the role of "Dragonfly Man", which immediately aroused the appetite of many children, because we all like fairy tales very much. Dragonflies began to blow bubbles as soon as they came up. She said helplessly, "We all like to blow bubbles, but small bubbles can't hold my big dreams." At this moment, an idea suddenly occurred to her, as if it were an epiphany: "Oh, I remember. Adding cod liver oil can make bubbles bigger! " Sure enough, as dragonfly and others said, bubbles appear bigger and brighter in the sun. ...
We also learned a lot in this program. For example, the experiment of "atmospheric pressure" is done with the famous "Madeleine Hemisphere": the two hemispheres are combined to make a sphere. I can't pull it out no matter how hard I pull it out. Does this make you feel strange? It turns out that the air inside was evacuated, while the air outside was squeezed in, forming a kind of pressure-atmospheric pressure. When you open the hole in the ball, the naughty air baby comes in, and the atmospheric pressure disappears quietly, so the ball can be opened.
In fact, science is around us, and science is everywhere. Let's discover the science around us and tap the treasure of the future!
Science is everywhere. Science is a developed science and technology. It is the crystallization of human technology; It is people's daily necessities; It is the dribs and drabs of life. For example, computers, electric lights, televisions, automobiles, and even rice cookers, induction cookers, and microwave ovens. These are not the crystallization of wisdom.
In our countryside, when my father was young, people still used plows, preferably animal power. Now that we have a tractor, we don't have to work so hard when plowing.
In ancient times, people recorded by knotting, and later invented Four Treasures of the Study: pen, ink, paper and inkstone, so people wrote on paper with pens. At that time, if you want to contact your relatives and friends, you have to write it on paper, and then you can give the letter to the other party after ten or even dozens of days of delivery by the post office. Modern people invented the mobile phone, which can not only make phone calls, but also edit what they want to say into short messages, which can be transmitted to each other instantly. Nowadays, computers are indispensable in our work and life. If you want to write a letter to a distant relative, you can send it by email on your computer, and the other party will receive it in a few seconds. It turns out that when people cook, they still use stoves and firewood as fuel. Now scientists have developed better stoves, such as microwave ovens, induction cookers and liquefied gas stoves. Just put the food to be cooked in advance, then set the function and time, and it will automatically keep warm after it is done.
All these examples can prove that science is everywhere in modern society. I firmly believe that China's scientific career will rank first in the world!
Science is everywhere. In daily life, as long as you pay a little attention, you will find many interesting sciences. If you don't believe me, please see:
Oh, no, raw eggs are mixed with cooked eggs. This situation is often encountered in daily life. So what should we do?
Don't worry, all you have to do is pick up one end of the egg and spin it on the table. If it can stand up straight and turn around the table several times, it is a boiled egg, otherwise it must be raw. When you spin all the eggs one by one, you can separate them. Why is this? Because the protein and yolk in the boiled egg are integrated with the eggshell, it can rotate; And those raw eggs, like children's internal contradictions, refuse to unite, then it will certainly not rotate. Don't you think there is interesting science in it?
For example, everyone likes reading books, but if the books are kept for a long time, the paper will turn yellow. Why? Is there any science in this?
Yes, it's scientific. It turns out that most of these papers are made of fibers from trees and grass. In this kind of fiber, besides white fiber, there are lignin, pigment and other things. Uncle worker tried his best to remove some lignin and pigment when making paper. But there will always be some left. As a result, after a long time, the paper turns yellow and brittle as soon as it is dried. You see, this ordinary little thing has a little science!
Look again, in our daily life, we often use dry batteries, but after using them, you will find that their shells are wet, and sometimes sticky liquid will flow out, that is, after being wiped with paper, it is still sticky. What's going on here?
It turns out that the shell of the battery is a cylinder made of zinc plate, which contains a lot of paste liquid containing chlorine atoms. Chlorine atoms and liquid on the zinc plate generally do not flow out. However, due to our use of the battery, the chemical reaction inside the battery continues. Every time two electrons are generated, a zinc atom in the zinc skin will be consumed, and zinc will be continuously damaged. Therefore, when the zinc skin of the dry battery is almost used up, the liquid inside will become wet. Look, isn't this science?
Gee, carrying a big schoolbag, my shoulders are really sour. What method can make the shoulder not hurt? Of course, this is to increase the area of the schoolbag belt, that is, to increase the stress area. Because the pressure is certain, if you increase the stress area, you can reduce the pressure. If the pressure is reduced, the shoulders will naturally not be sour. Look, isn't this very common? But it also includes science.
Science is actually everywhere. It is not difficult to find it as long as you look hard.
Science is everywhere. In this long summer vacation, I finished reading a book like We Love Science. This book is rich and colorful, with plants of different shapes, fierce and cruel animals, grotesque microorganisms and so on. Besides, there is a lot of scientific knowledge. The plot in the book is lively, interesting and fascinating, which makes people feel like swimming in the ocean of science.
There is so much knowledge in the book. Look, here is a secret of treating diseases with plants. Among them, it is said that the reason why medicinal plants can cure diseases is that they contain some active substances for treating diseases, including alkaloids, flavonoids, phenols, terpenoids, glycosides, volatile oils, organic acids and multivitamins. These chemicals mainly exist in the roots, stems, leaves, fruits and seeds of plants, and some even spread all over the whole plant. Plants can be described as human natural pharmacies.
See, this is the secret of plant healing. Did you feel suddenly enlightened after reading it? In the book, there are some small scientific experiments. Once, I saw a title "Rice Dance" from the catalogue. Out of curiosity, I followed suit and prepared the necessary materials: transparent cup, water, vinegar, baking soda, ink, dropper, rice and spoon. I first put some water and vinegar in the cup, and then slowly added a spoonful of baking soda, because there were many bubbles when I first put it in the club. Add another spoonful when the bubble is gone, and add a little ink when the bubble is gone. Finally, the interesting part: put the rice in, the rice will sink at first, and then float again, which looks like the rice is dancing.
After reading this book, I learned a lot of scientific knowledge and gained a lot. At the same time, it also makes my summer vacation rich and colorful.
Science is everywhere. Science is everywhere. Even a small watch contains a lot of science: running-in of gears, calculation of time ... So, what's the use of science? There are too many, such as aerodynamics for gliders, mechanics for roller coasters, streamlining for ships and so on.
Many interesting things can be made by using science, such as small toys such as wind turbines and electric paper planes. In view of these, the school has designed many competitions, which constitute the Science and Technology Festival.
Let's talk about wind turbines first. The wind driven vehicle consists of a vehicle body, two 1.5V batteries, a motor, a battery box,
A fan. When the current drives the motor, the motor drives the fan and uses the reaction force to make the car move forward. If you want to adjust the angle of the car, you can do it through the front wheel.
Let's talk about the electric paper plane again. The electric paper airplane consists of a paper airplane, a capacitor, three 1.5V batteries, a battery box, a propeller and a small motor. Firstly, the capacitor, propeller and small motor are fixed on the paper plane, and then the battery box and capacitor are connected to charge. After about 20 seconds, the plane can be thrown out. A paper plane with a propeller can fly for 90 seconds, but the direction is uncontrollable.
Science is everywhere. I hope you can get more new knowledge and pay more attention to the science around you in the science and technology festival. Come on!
Science is everywhere. In the summer vacation, I carefully read the book 1 19, the great moment when science changed human life. This book presents a classic moment when science has changed life at home and abroad since the 20th century. Through reading, I found that science is so fascinating and the world I live in is full of surprises. This book contains the intellectual achievements of human scientific development. After reading it, it helps me to know more about myself, our planet and our future.
Grandpa Lu Yongxiang, former president of China Academy of Sciences, said in the preface: "Since the 20th century, driven by the growing economic and social needs and people's endless curiosity and interest in innovation and creation, science and technology have changed with each passing day, bringing new surprises and changes to human economic and social development and injecting new impetus and vitality." Yes, from the plane flying in the blue sky, the rocket flying in the sky, to the advent of the first computer; From the invention of penicillin, the birth of cloned sheep "Dolly" to synthetic chromosomes; From the use of toilets, the introduction of air conditioners and washing machines to the popularity of mobile phones ... science affects us all the time.
What impressed me most in the book were the three inventions of bar code, hybrid rice and Tencent QQ. They are very common in life, giving people a common feeling, but it is their appearance that has changed our lives.
Barcode was invented by American college student Joe Woodland and his friend Bernie Seward. This is an automatic method to read product information. The first product scanned was Wrigley gum, which cost 69 cents. Since the invention of 1949, this magical and changeable stripe has been scanned around the world about 8 billion times a day. It can be said that our life can't be separated from bar codes: taking medicine at the hospital pharmacy, checking in at the airport, borrowing books from the library ... Last year, we experienced a "checkout counter" in Wal-Mart supermarket, and it was really convenient to count the total price of goods with bar codes!
Hybrid rice is called "Oriental magic rice". Its birth enabled China to feed 22% of the world's population with 7% of the world's arable land. Inventor Yuan Longping is known as "Father of Hybrid Rice", "God of Rice" and "Contemporary Shennong", and even regarded hybrid rice as "the fifth great invention" of China internationally. Grandpa Yuan Longping is over 80 years old, but he is still struggling for "super hybrid rice". He said, "I had a dream that the stalks of hybrid rice were as high as sorghum, the ears were as big as brooms, and the rice clusters were like grapes ..." What a beautiful dream!
If barcode is a magical black-and-white world and hybrid rice is a great green revolution, then Tencent QQ is the "little penguin" that everyone loves. * * is a communication network tool based on Internet technology. According to the survey, QQ has become another communication tool for China people after telephone and mobile phone. In terms of frequency of use, QQ even exceeds fixed telephones and mobile phones, and almost everyone has it. Even I, a primary school student, have my own QQ account, and there are many QQ groups ... I think in the beginning, people in ancient China used bonfires and post offices to exchange information. "After three months of war, a letter from home is worth a ton of gold" and "Folding flowers to welcome express delivery and sending them to leading people" all reflect the backward communication situation at that time. Nowadays, people all over the world can connect instantly with each other just by moving their fingers. This is the charm of science!
It is difficult to change human life. Only persistent people can bring good news to the world on the wings of science. For example, Einstein, a famous scientist, faced unprecedented pressure when he published his theory of relativity. Many scientists opposed his theory, but a few years later, more and more colleagues began to admit his research, and his amazing new ideas were proved to be correct by more and more people. Another example is Ma Yun. 1999, he led his 17 people to establish Alibaba in Hangzhou. It is said that when he started his business, the company was in the "Lakeside Garden", which is very close to our Xue Jun primary school! Today, Alibaba is the largest Internet company in China, the second largest Internet company in the world, and a famous brand of global B2B e-commerce. Dream, passion and responsibility are the secrets of Ma Yun's success.
What is science? Science is the endless curiosity of human beings. Science has opened one magical door after another for us, and there are always surprises waiting for us ahead. As a primary school student, we should study hard, swim in the ocean of knowledge and bravely climb the peak of science. We should not face science across the bank, but become friends with science, because science is full of power and everywhere!
Science is everywhere. Composition 10 Students, whenever you hear the word "magic", what do you think of? Aladdin lamp? Flying carpet? Or the magic flute? Oh, please don't think that magical things only exist in myths. In fact, seemingly boring science is also amazing.
Do you like to drink coke? I like drinking coke in summer best. The moment when the cold coke touched my mouth was really comfortable, but did you notice that the straw in the coke wouldn't sink? I did an experiment like this today.
I brought a coke and a cold boiled water first, and then put a straw on each cup. Then, something magical happened-the straw in the cold water suddenly sank and hit the bottom of the cup, but the straw in the coke floated up. I felt very strange in my heart, thinking: What magic does this coke have to make the straw float? This must be a coincidence. Let me try again! Then I poured another coke and replaced the boiling water next to it with juice. The result is the same as before. I couldn't help shouting, "What is this? How so weird! " My sister, who is doing her homework, heard the sound and my experiment. She couldn't help laughing: "Don't be silly! There are certain scientific principles. The density of coke is like a big net. Straw will bounce back when it touches this big net, just like playing trampoline! You will understand when you go to junior high school! " Sister said and smiled. I suddenly realized.
Although my sister's words made me a little unconvinced, I was still very happy to solve this mystery. The straw in the coke can float because of that magical density! It seems that when exploring the mysteries of science, we really need to consult others, do more experiments and observe carefully! Science is everywhere!