In study, work and life, everyone will inevitably come into contact with writing, and people can achieve the purpose of cultural exchange with the help of writing. What kind of composition can be called an excellent composition? The following are 8 scientific compositions of grade six that I collected for you. Welcome to read them. I hope you will like them. I wonder if people realize that science has deeply influenced our daily life and played an indispensable role in the present social development. Science, an invisible and intangible thing, is always in our lives. And we also need to discover it and explore it, in order to find more interesting things and phenomena and gain more knowledge.
on Sunday, mom and dad are not at home. I was so hungry when I just got up that I turned the kitchen upside down, but I didn't find any food to eat. And mom and dad left in a hurry and didn't make breakfast. This is really hard for me. Go out and buy food, and there is no money around; Don't eat, but I'm so hungry that I can't do my homework. Eyes shot at every corner of the house, and finally found a canned yellow peach in the pantry in the living room. I immediately jumped at it like a hungry wolf and caught this can of "help". However, how to open it has become a difficult problem. I'm so hungry that my hands are weak, and my strength is already small that I can't twist it hard. I am so anxious that I just want to cry-if you are in my state: you are too hungry to eat, but you can't eat delicious food in front of you, you will be so anxious. However, I chose to calm down first and think about the solution. Finally, I decided to ask the "computer teacher".
Sure enough, the "computer teacher" immediately gave me an answer: you can knock the lid of the can on a stone or other solid thing first, and when you hear a bang, it means the lid is open.
how come? Open it so easily? Forget it, let's try it. Maybe it can really be opened. However, I looked around and found nothing solid. On second thought, I suddenly remembered the stairs. So I opened the door, chose the stairs, put the can lid on the stairs and knocked. "Knock, knock, knock ..." I knocked many times, but the lid still didn't open. But I didn't lose heart and kept knocking. "Knock, knock ... knock, knock, knock!" Ah, it finally rings! But is the lid open? I picked up the can bottle with a grain of salt, twisted it gently and opened it! Inside, a scent of yellow peaches came to my face. I was so excited that I quickly went back to the house, took out my spoon and gulped down the canned food.
But while enjoying the delicious food, I can't help wondering what's hidden in it. Why does it open automatically when I knock on the lid of a can? So I went to consult the "computer teacher" again. The "computer teacher" is really rich in knowledge. There are not only solutions to problems, but also the reasons for these solutions. It tells me: "Knocking the bottle cap on the ground not only changes the shape of the bottle cap, but also knocks out the gap between the bottle cap and the bottle mouth, that is, the air leaks, so the bottle cap bulges, just like the bottle cap will inflate. In short, it is the gas that enters the bottle from the outside, increasing the pressure inside the bottle, so the lid is opened. "
Actually, it's not just the opening of cans. Every little thing in life may contain scientific knowledge and mystery. Therefore, we should carefully discover, boldly ask questions and try our best to explore, so as to enrich our knowledge, improve our practical ability and help us understand more scientific knowledge. The composition of science in the sixth grade 2
Science class is one of my favorite subjects, and I hope that the bell will ring slowly in every science class. This year's long-awaited "Xiamen Youth Fun Science Competition" finally arrived, and two other students and I went to participate in the competition with full confidence under the leadership of Teacher Fang.
At the entrance of the competition area of the Science and Technology Museum, clusters of contestants from all primary and secondary schools in the city who come to participate in the competition are waiting to be checked in with specially selected materials. Under the guidance of the teacher, the contestants checked in and arrived at the designated competition area in an orderly manner. With the announcement of the referee, the competition began: the contestants began to make model airplanes in an orderly manner according to their usual training steps. Our group cooperated in cutting the foam template, matching components, pasting process, etc. When fixing the wheel with glue, our group unanimously predicted that the airplane model would not work in the sink, so we decided to fix it again with 52 standby glue, but 52 glue was like a naughty and hot child. At first, it stayed in the bottle anyway. Impatient, I directly unscrewed the lid and squeezed it down with the power of the universe. All of a sudden, the spiritual 52 came out to the exit, and a big drop flew to the wheel. I looked down with a bang, and it was not an important problem to stick my hand to it. What was even more frightening was that the foam board was completely corroded by the high-temperature 52 glue and broke into two pieces. All of a sudden, the three of us stared at each other-silly!
"redo"-we have to face these two words, starting from the original state: scribing, cutting, pasting, assembling ...... but when pasting, the referee's voice came from the microphone, saying that the competition time is coming, and students should hurry up! At this time, we were extremely nervous, and I felt that I was sweating all over. Everyone grasped the work in their hands and was forced by time to finish the model airplane in a hurry. However, after being put into the sink, the model airplane stood motionless under the drive of electricity. Obviously, the model airplane made by our group failed in this model airplane competition! It is obvious that our group scored' duck eggs' in the model airplane competition in the morning. Looking at our dejected teacher, he encouraged: "Failure is the mother of success! Don't lose heart, learn a lesson, there will be a competition in the afternoon, come on! "
after listening to the teacher's words, we raised our heads and United again, striving to make the afternoon project the best and earn back what we lost in the morning. In the afternoon competition, the paper folding boat carries things, and our group keeps the stress area of the paper boat as small as possible, so the heavy objects carried by our paper boat will not capsize. Our group was the first among all the primary school groups to finish, so the referee made our group's paper boat carry things twice. In every transportation process, we are afraid to handle it lightly, for fear that the paper boat will capsize into the water because of us. Our group has achieved good results in this paper boat loading competition.
The one-day science competition has ended, but I didn't feel it was over in my heart. This competition ended in failure because of my impatience and mistakes. I feel very guilty and uneasy! But the teachers and team members didn't blame me. In the afternoon, we still cooperated and encouraged each other and got good grades. Therefore, through this competition, I learned a lesson: in the future, no matter in study, examination, competition, life, etc., the most undesirable thing is "impatience", because once people are impatient, it is not easy to control their emotions, and unpredictable mistakes or mistakes will occur. I must guard against arrogance and rashness in my future study and life and be a down-to-earth person. In the science class, the teacher gave us an interesting experiment, and I want to practice it myself. I couldn't wait to prepare the experimental materials as soon as I got home.
I went into the kitchen, opened the cupboard, first took out white vinegar and baking soda, then took out the detergent from the cupboard and put it on the table, and finally took out a small glass and stick. I brought a pen with blue ink in order to see more clearly and make white vinegar more beautiful.
with all the tools ready, I started the experiment. I selected a glass from the materials and took out a white vinegar bottle. This bottle of white vinegar is still new, and it has packaging. I carefully cut a small hole in the plastic that tightly wrapped the bottle mouth. With this breakthrough, the package was torn in half. Exposing the bottle cap, I pulled it off and poured white vinegar into the cup. After half a cup, I stopped pouring and began to drip ink. As soon as I took out the pen, I smelled a smell of white vinegar, which was particularly pungent, like the north wind in winter. Cold and sour, several times more sour than lemon. Although lemon can sour your teeth, it has a fruity fragrance. White vinegar, on the other hand, not only lacks the fragrance of fruit, but also is mixed with the spicy taste of alcohol, which makes me blind. I thought to myself, "White vinegar is so sour and smelly. It's not easy to do an experiment." My heart beat a retreat. However, an example in which a scientist tried a thousand times and finally succeeded emerged in my mind, and my heart revived.
I clean the tip of the pen and put it on the rim of the cup. Holding my breath, I slowly squeezed the ink sac down with my hand and squeezed out five drops of blue ink. The five drops of ink fell one after another and sank into the bottom of the cup, quietly, like a blue coral reef. I accidentally touched the cup with my hand, and the cup moved forward a little. The coral reef moved, swayed with the shaking of the water, swayed upward, and "diffused", and gradually dissolved into the water. The water became blue, like the light blue when the sea met the sky, with silk in the blue.
I squeezed a few drops of fragrant detergent, which bounced down from the bottle like naughty elves, and a faint lemon smell floated along the way. A burst of sweetness suddenly filled the cup, covering up the sour white vinegar, and a clear film formed at the junction of vinegar and air. I stirred clockwise with a small stick, and the sound of "ding dong" was endless. In a short time, vinegar was covered with foam, and hundreds of small bubbles were like pearls, colorful under the sunshine, and thick, like a layer of broken glass slag. You can see your figure through the glass. I thought contentedly: It should be good to stir like this.
next comes the most important step-adding baking soda. I put the little Su in the bag in a spoon. The baking soda is white, as white as snow. When I am ready, I slowly lift the spoon and hang it at the mouth of the cup. Suddenly, a little bit of baking soda fell into the cup and into the vinegar, making a "zi zi" sound, accompanied by some small bubbles. Then, I poured the baking soda into it all at once, and there was a "rushing" sound. Blocked baking soda fell into the sea of vinegar like a huge iceberg, and was swallowed up at the fastest speed. It was only two seconds before it reached the bottom of the cup. Soon surrounded by baking soda that did not melt in vinegar, the whole iceberg was swallowed up like this, and the resulting clouds of foam rose rapidly like a volcanic eruption, like a fountain spouting spring water, from the original half cup to the half cup. "Not enough, not enough!" I poured some baking soda again. This time, baking soda was like a waterfall, and it made a big hole in the foam and went straight to the white vinegar. I put the stick in and stirred it. Now, like a hornet's nest, the foam went straight up. I was too surprised to blink for fear of missing something. Through the glass wall, I saw that the baking soda deposited on the bottom of the glass was constantly melting and bubbling, and the foam had rushed out of the bottle mouth against the foam, which was unstoppable. I was quick of eye and load, so I took out a basin and put the cup in it. This dreamy blue foam floated into the basin like a fog for a long time, and squeezed the sticks in the middle. After the "volcanic eruption", the foam receded after a few minutes, and the peace before the experiment was restored. This spectacular sight made people very shocked and happy at the same time-the experiment was successful, and it took me a long time to calm down.
what is the secret of "volcanic eruption"? I decided to ask the secret: white vinegar reacts with baking soda to generate carbon dioxide. Although the thermal effect of this reaction itself is almost zero, carbon dioxide increases the surface area of water, makes the evaporation speed of water faster and cools it down. Little Suda is sodium bicarbonate. After mixing with vinegar, it will react violently and produce a lot of carbon dioxide. I suddenly realized, picked up a pen and paper and began to record the experiment.
This experiment not only enriches our scientific knowledge, but also makes us understand that as long as we have a pair of eyes that are good at discovering and a heart that is brave in exploring, we can discover the science in life. A bad thing happened today. I accidentally dropped the book into the water, and I quickly fished it up, but it was too late, and the book had become a "drowned rat". I put the book in the sun to dry sadly, and when it dried, it became wrinkled.
I went to ask my mother what to do. My mother said, "Put it in the refrigerator! Water will form ice below degrees Celsius, and when the ice directly volatilizes into water vapor, the book can be restored. " "Is this true?" I think I finally put the book in the freezer with the idea of giving it a try.
a few days later, I opened the refrigerator, and the book had turned into ice, and the surroundings were sealed by ice, but the book remained flat and not wrinkled at all. A few days later, I opened the refrigerator again, and the book was still frozen, but the top was dry and remained flat a few days ago. In the later days, the area of ice became smaller and smaller, and finally it was all dry.
I am happy to hold my hands and feet flat. This is really a good way. I will never be afraid of books getting wet again.
In fact, there are many small scientific methods in life, which contain scientific principles. As long as you are willing to use your head, the methods will be much more difficult. Everyone has a dream, but there are differences. My dream is to be a scientist and invent something useful to human beings like Edison.
As for why I have this dream, because I feel that modern technology is still not convenient enough, I want to invent something that is good for human beings. I have already figured out the direction of invention, that is, housing and travel, to make people more convenient.
The ideal is a cup full of water, the reality is that cup, and the effort made in it is the water added to it. If this glass of water is full, it means that you have successfully completed your ideal. Besides, you can only be happy if you realize your dreams by yourself, just like Francisco in Spain? Pizarro said: If you want to go high, use your own legs! Don't let others carry you aloft; Don't sit on other people's backs and heads.
On this day, I got on the travel tool invented by myself. This is a spaceship that can sail at the speed of 3 million light years per hour, which is the latest product. I started the spaceship and came to the 42,124 th scientific and technological parallel universe discovered by human beings. This is the most developed universe. Today is an important day, because I have to test an epoch-making travel product I invented recently-teleport machine. This machine can be teleported to any position, which is a milestone in the history of human invention. When I arrived at the experiment, many people paid the highest tribute to me. The test began. The brave experimenters sat on the equipment and only heard a ding. They appeared at the target location, and the test was successful! My tears gushed out like a torrent. I was so excited! My day and night work has paid off!
In order to be a good scientist, I watched many science and education films and related articles.