Interesting little experiment 400-word composition 1 In science class, the teacher gave each of us a balloon, and everyone couldn't help blowing it up. Whew, I accidentally, the big balloon rushed into the sky, and then it fell weakly to the ground.
The teacher on the side suddenly spoke: "Why do balloons fly?" I frowned. "This is because the gas inside comes out backwards and pushes the balloon." The teacher then asked, "What is the relationship between the direction of gas injection and the direction of the balloon?" "On the contrary." "We call this force recoil. Can you use this force to make the car run? " "Of course! Of course! " We are all eager to try.
After careful observation, I found a short tube on the car, one large and one small. The experiment began. Let's first put the mouth of the balloon on the big mouth of the pipe in the car, aim the mouth at the small mouth, summon up our cheeks and blow hard, blow up the balloon, and hold down the mouth with our hands to prevent the gas from escaping. Then put the car straight, loosen your fingers, and the gas in the balloon suddenly spurts backwards, and the car rushes forward quickly, which is really a bit like the feeling of a rocket taking off. "success!" Everyone cheered and jumped up. Later, we also set up a 45-degree slope, which easily rushed over.
When I got home, I told my father about this interesting little experiment I did at school. Father added, "In life, many things also use the recoil principle. One of the firecrackers? Flowers? When gunpowder burns violently, it will produce gas.
When it pops up from the lower end of the flowerpot at a fast speed, the flowerpot itself rises upward. In nature, some animals can escape by recoil!
A small scientific experiment can get so much knowledge, no wonder the teacher often says to us, "Practice makes true knowledge"!
This morning, when I was sleeping, I suddenly heard several urgent calls from Ding, so I had to call my mother to answer them.
I was awakened by the phone, so I had to wake up. Suddenly, a row of neat words appeared in front of my eyes: why can I hear the other person's voice clearly when I make a phone call, even though it is thousands of miles away?
After breakfast, I asked my mother this question. My mother told me the truth of this problem, but I didn't understand it after listening for a long time. Mother said, "OK, let's do a little experiment." You go and find two cans and a long line. "When I heard that I was going to do a small experiment, I suddenly got up and found two cans for my mother.
Mother found a hammer and a nail from the parts box and asked me to do as she said. First, I carefully opened the lid of the tank and cut two small holes in the bottom of the tank with a hammer and nails. Then put the two ends of the long line into the small holes at the bottom of the two cans respectively, and finally make a summary at both ends of the long line to make it firm. Looking at the finished "telephone", I can't wait to pick it up and use it, so that my mother can put the can to her ear and listen to me for a few words. However, my mother always said that I couldn't hear. I picked up the phone in frustration, looked at it several times and tried again. But, yes! Seeing my helplessness, my mother said to me, "straighten the rope and try again." I tried again, and sure enough, I finally succeeded.
Through this small experiment, I suddenly realized that talking to the microphone is to make the metal diaphragm at the bottom of the microphone vibrate with the sound, and it is vibrating with a magnetic spring. Induction current is generated in the electromagnetic coil, and the current is transmitted to the receiver through the wire, so that the diaphragm on the receiver vibrates accordingly and the sound is restored.
This is really an interesting little scientific experiment, which benefited me a lot. It's really practice that makes true knowledge!
I watched Happy Camp for two hours yesterday. The program lasted for about an hour, and finally it reached an exciting moment-the last activity of Happy Camp: "Ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah, ah. . In this activity, there are many experiments, such as chemical ice cream, but what I am most looking forward to is the terrible whole person experiment.
The way to do this is: prepare a bucket of hot water and a bucket of cold air, pour the hot water into the bucket of cold air, and suddenly a white gas will come out. Seeing this scene, I opened my mouth in surprise. This experiment is really fun. I really want to try it myself!
Let's get started. I went to find a pot of boiling water that grandma had just cooked, but how to make the air conditioner? Ah, I found it! I opened the bottom of the refrigerator, took out some ice cubes and put them in an empty bottle. When the cold air was enough to fill the whole bottle, I found another bottle to cover it. Then I brought the pot of hot water, stood high and slowly poured it on the glass bottle from top to bottom. When hot air meets the glass bottle wall filled with cold air, a white steam comes out. Oh, so this is steam!
This experiment was originally operated by using the principle of thermal expansion and cold contraction, hot air rising and cold air falling. It's really interesting. Let's try!
Interesting experiment 400-word composition 4 In the math class on Friday, we did a very interesting thing: burning sugar. I was curious when I heard the name of this experiment. I thought: What happens when the sugar is burned? Is it white or black? Is it dry or wet? ..... One by one, whimsy came to mind. After listening to the main points of the experiment and the key points to be observed, we began to do the experiment.
With a bang, the match was lit, and we quickly lit the candle. Because we burn sugar with candles, we all put a napkin under it to prevent wax oil from dripping on the table. Before burning, white sugar was white particles, and it changed after only burning for a while. At first, the sugar began to melt, and it was still bubbling. After a while, it swelled and turned khaki. It is still bubbling, and it is getting bigger and bigger. "poop!" One bubble burst, and another bubble popped up, as if the volcano was about to erupt. After burning for a long time, the spoon began to smoke and the sugar gradually solidified. We thought it was over, but when we saw that the other group of sugar was actually burning, we ran over and quietly learned what was going on. It turned out that they tilted the spoon so that the black thing on it touched the external flame. After a few seconds, the sugar burned. However, we didn't pay attention to the direction of the flame. It was the flame that jumped on the napkin that scared us. After crazy fire fighting, the fire went out and the candle went out. At this time, when I look at the candle again, I see that it has also become much shorter and the wax oil has not taken off. Moreover, the caramel in the spoon is dark, not like it just now, and it is very brittle, and it will crack with a pen.
Through this experiment, I know what sugar looks like after burning, and I also know a lot of knowledge that I can't know without doing experiments. This is a meaningful experiment.
Interesting little experiment 400-word composition 5 I have finished my homework today. I was idle and bored, so I pulled out a book from the shelf and read it with relish. I suddenly saw an experiment and wanted to do it myself.
So I carried out the experiment with experimental materials: I first filled a coke bottle with 3/4 water, then inserted a straw in the water, and then inserted a curved straw in the bottle. Next, I sealed the coke bottle with soaked facial tissue. Finally, I blew away the straw that didn't touch the water according to the instructions in the book. Guess what? As the book says, water actually comes out of a bent straw.
After this experiment, I was curious, "How did the water in the coke bottle come out?" For this matter, I specially looked it up on the Internet, and the computer immediately gave me the answer, "After blowing, the air pressure in the water in the bottle increased, so the water was squeezed out from another straw, thus forming a fountain.
After understanding this truth, I was curious and thought, what if I used suction instead of blowing? I did another experiment: as a result, the water in the bottle bubbled, so I checked the computer again. I just know that the air pressure becomes smaller after the coke bottle is inhaled, the air outside the bottle will enter the bottle through another straw, and the water in the bottle will bubble.
Afterwards, I told my aunt about it. After listening, my aunt said to me, "It is very helpful for you to do more small experiments."
Interesting little experiment 400-word composition 6 This afternoon, our school held a science and technology little experiment competition. Everyone is in high spirits.
When we arrived at the gymnasium on the third floor, we sat down and waited for the game to start. The game has started. First, the performance of Class 5 (1) is "the bottle is flat", and then the performance of Class 5 (2). After a while, it was time for our class, and all the students cheered for Xin Bochao. This little experiment done by Xin Bochao and Kang is called "the magic of air pressure". The materials needed are: a bowl of water, a plate, a glass, a bottle of ink, a candle and a lighter. The experiment began. Xin Bochao is responsible for the explanation, and Kang and Xin Bochao's mother are responsible for the operation.
First, Kang poured water into the plate, inserted a candle and lit it. Then, he put a few drops of ink in it and covered the glass with a candle. After a while, the water really rose. It's amazing! The students were dumbfounded. Then, Xin Bochao said confidently: "The principle of this experiment we did is that when a candle burns, it needs oxygen. When the cup covers the candle, the oxygen in the cup is quickly consumed by the candle, causing the air pressure inside the cup to be less than the air pressure outside the cup, so the water will rise. " As soon as the voice fell, Kang carefully held the plate to show the judges the magic of air pressure. Then, we watched the sixth grade experiment, which was wonderful. ...
After watching this competition, I know that science comes from our lives. As long as we look at things with an exploratory eye, we will find more interesting things!
Interesting little experiment 400-word composition 7 Today, Teacher Liu brought a candle and a plastic jar to class. Is it necessary to do another experiment? Just when I was puzzled, Teacher Liu smiled: "Let's do an experiment today!" ""what experiment? " I can't wait to ask. Teacher Liu said kindly, "The candle is out. "
First, help Mr. Liu push the table to the middle, say to start from the beginning, open the plastic can and take out the lighter. At this point, I dare not let Mr. Liu light the fire. But the alcohol in the lighter seems to say, "Quick, quick, light it for us." We watched Mr. Liu light the fire, and I squatted down and stood up to watch. Ni Hanyi kept calling: "Teacher, we can't see, teacher." I asked Xiao Ni to come to my HD video. After a while, I was stuck here, so I had to change my angle. After the teacher lit the fire, my deskmate said, "Teacher, give you some water to put out the fire." But teacher Liu said, "No." The teacher slowly put the candle on the table. I'm afraid it will burn Miss Liu. Then put the lid on the candle and put it out. Zhu Xiang explained the reason. If there is not enough air, the candle will "suffocate" and it needs oxygen to burn.
In this experiment, I understand that combustion needs oxygen? Yes At the same time, it also made me realize that I should observe and think more in my daily life.
Interesting experiment 400-word composition 8 Add salt to a cup of hot water and stir with chopsticks until the salt no longer dissolves. Take another 20-30 cm long cotton thread with a paper clip at one end, then soak the cotton thread in concentrated salt water for a few minutes, take it out, clamp it with plastic clothes, and hang it to dry. Soak the dry cotton thread in concentrated salt water again, then take it out and dry it, and so on for many times.
Now you have a specially treated cotton thread. Because this kind of cotton thread is not much different from ordinary cotton thread in appearance, you can invite children to watch the following experiment, and they will certainly applaud your "magic".
You can tie one end of that special cotton thread to the iron wire and let the end with the paper clip hang under it. Then, you can ask the child first: "What will happen if I burn this cotton thread with a match?" The children's answer is exactly what you expected-"Of course it will burn out." At this time, you light the lower end of the cotton thread with a burning match. The flame will burn slowly as everyone imagined until it burns out on the wire. Your child will immediately exclaim, "Wow, this burnt cotton thread is not broken, and the paper clip is still hanging there!" "
Now, you can reveal the mystery of this "magic" to the children. You can also tell them the scientific principle: special cotton thread is full of salt crystals. After ignition, although the fibers of the cotton thread have been burned, the salt with a melting point as high as 800℃ has not been affected, so the cotton thread can still maintain its original shape and does not seem to be burned out.
There are many mysteries worth exploring in our life. I have done many small experiments, but I think the most interesting experiment is that when a ruler rubs your hair, it can suck away small pieces of paper. Let me introduce you.
One day, I was idle and suddenly came up with a bad idea. I have nothing to do anyway, so I'd better do a little experiment. First of all, I opened the newly bought 100,000 whys to see if there were any interesting experiments. Ah, an amazing experiment appeared in my sight. The ruler can absorb small pieces of paper after rubbing on the head. Actions speak louder than actions. I'll start. I couldn't wait to wipe my hair with a ruler, then cut the paper into small pieces and put the ruler next to the paper, only to find that the ruler didn't lean on the paper, but the paper consciously "jumped" on the ruler. Why? I thought hard for a long time before I realized that there was a lot of invisible charge on the ruler after rubbing it against hair or leather. These charges like to attract light and small objects, so the charged ruler sucks up small pieces of paper.
After listening to my introduction, you must find it interesting to do experiments! Then let's go into the vibrant nature and discover more scientific secrets that no one knows!
Interesting little experiment 400-word composition 10 Recently, I was reading an adventure Little Tiger series novel "Disappeared in the Witch's Carnival Night". The last few pages of that book are full of small scientific experiments.
On that day, after reading the whole book, I couldn't help sighing: "Ah! Wonderful! " Then, I turned to the next page, which read: Little Tiger's secret record. Secret records? What secret record? Curiosity drove me to have a look. Then, I opened and read all these pages. I'm not interested in anything except one thing: secret letters without ink. I watched it several times again. I think I should also do this experiment. I read a book first. The first step is to prepare two pieces of paper, a pencil and a piece of glass. I quickly tore off two pieces of paper from my homework book and took out a pencil from the pencil case. Just use the glass on the window! All right! I'm ready. Then dip a piece of paper into the water, then pick it up and spread it on the glass, then cover it with zhangqian's paper, and then write down your information with a pencil. I finished it at once. Let's see the results! I soaked the paper in water again, ah! The handwriting appeared! I don't know what happened, but it's amazing and interesting!
Now science is really amazing! Now my scientific knowledge is not very rich, so I must learn more!
Interesting experiment 400-word composition 1 1 Today I'm going to do an interesting scientific experiment about the power of chopsticks.
Of course, materials are indispensable for doing experiments. I can't wait to prepare the experimental materials: a plastic cup, a cup of rice and a bamboo chopstick. I first poured rice into a plastic cup, held the rice in the cup with my hands, put bamboo chopsticks between my fingers, and then gently lifted the chopsticks with my hands, but neither the cup nor the rice was lifted. I tried several times again, but it didn't work. What happened?
I took my father's mobile phone and looked at the experimental principle, and then I suddenly realized. It turns out that chopsticks can lift the cup and rice because the air in the cup is squeezed out when rice is pressed by hand, and the pressure outside the cup is greater than that inside the cup, so that chopsticks and rice are closely combined and chopsticks can lift the cup full of rice. The reason why I failed was that I didn't squeeze all the air out of the cup. Failure is the mother of success! Try again! This time, I pressed the rice hard, and then pressed it with my fist, thinking: This time, I must squeeze the air out of the quilt. Then gently insert chopsticks, and finally I gently lift chopsticks haha! I finally succeeded!
Through this small experiment, I understand a truth: you can't give up easily when you encounter difficulties in doing anything, you should think more and try to succeed, and don't make excuses for failure.
Interesting little experiment 400-word composition 12 Today, the teacher gave us a little experiment called "X eggshell disappears". I was very surprised at the moment I saw the experimental results. I think the teacher must have put a spell on the eggs. I want to try it myself!
I prepared a raw egg, a bottle of white vinegar and a glass first. Then clean the raw eggs, put them in a glass, and then pour white vinegar into the glass until the eggs are submerged. Then, you can see that the eggs are wrapped in many small bubbles!
A day later, the eggshell of the egg disappeared and a layer of soft skin floated in the cup. Then take the eggs out of the cup, clean up the impurities in the cup, and then soak the eggs in white vinegar.
Soak for another day, take out the eggs, wash them and dry them. There is a soft and translucent film outside the eggs. The egg feels soft and elastic, like a translucent elastic ball.
I put it next to my pillow when I sleep at night. At night, I put the flashlight under it and turn on the power. Eggs glow! I think: I'll name it, just call it the night pearl!
The next day, I asked my father why the eggshell was missing. Dad said: "Egg shells contain calcium carbonate, and the main component of white vinegar is acetic acid. When they are put together, chemical reactions will occur to generate water-soluble substances and carbon dioxide. "
It turned out that the egg shell was dissolved by white vinegar. Scientific knowledge is really interesting!
In science class the other day, the teacher asked us to prepare a small light bulb, a 1 battery and some wires. When I got home, I asked my mother to find me a small light bulb, and then I took out the wires and batteries and began to do the experiment.
First cut off the skin on both sides of the wire to expose the wire inside. Then tie the wire to a small light bulb, put the other end of the wire on the "-"pole of the battery, and put the small light bulb on the "+"pole of the battery, and the small light bulb will light up. , "ah, the little light bulb is on! Finally lit up! " I cheered happily and my heart was filled with great pride. I wanted to see if the other light bulb could light up, so I switched the light bulb to the wire. As a result, the light bulb is only a small part of the wick, emitting faint light, just like a firefly emits light from its tail. I found three more batteries, connected them in series, and then tried again. The light bulb is very bright. I bought two more batteries and added them to make the light bulb brighter. As a result, the small light bulb suddenly flashed and the light went out. I am depressed at this moment.
What's going on here? I was puzzled, so I asked my father. Dad drew the experiment clearly on the paper. Through the picture, I finally know that the voltage of the battery should be the same as that of the small light bulb. Only when the current passes through the filament can the small bulb light up. If the positive and negative poles of the battery are directly connected, it will also lead to short circuit.
This interesting experiment enriched my scientific knowledge.
Interesting little experiment 400-word composition 14 electricity has many uses. Can be used in lights, air conditioners, mobile phones, and can also make things turn. I thought, "What other uses can electricity have?" So I did a compass experiment.
I first prepared two round one-dollar coins, a thin toothpick and a thin, long and smooth straw. When I was ready, I put the materials on a flat table and couldn't wait to start the experiment.
I put the smooth side of one coin on the table, and then put the other coin vertically on it. He is like a naughty boy and doesn't listen at all. I tried again and again, and finally succeeded in standing the coin upright.
Next is the most critical moment. I carefully put the toothpick on the two millimeter thick coin. Although I was careful, it fell, but I was not discouraged. I put the toothpick on the coin intently, and even my breathing became lighter, for fear that I would blow hard, and all my previous efforts were in vain. I took a soft towel and straw, wrapped the straw tightly with the towel and rubbed it hard. After rubbing it repeatedly for about 50 seconds, I approached the toothpick gently. Something magical happened. The toothpick seemed to be enchanted and turned with the straw. Straw to the left, toothpick to the left; Straw to the right, toothpick to the right. Like an arrogant conductor. My experiment was successful, and my heart was full of joy!
Why does the straw rotate with the toothpick! It turns out that the friction between the plush fabric and the straw drives the toothpick to move.
This is the mystery of the wand. There are many other secrets in life that we should discover and explore by ourselves.
Interesting little experiment 400-word composition 15 As soon as I saw the word "interesting", I couldn't help thinking of the interesting little scientific experiment I did at home.
I remember it was in the fourth grade. I read Adventure Little Tiger and learned how to write secret letters in it. I can't be calm for a long time. I thought: how interesting this is! If I learn this method, I can write my little secret on it. The method of making a secret letter is very simple. Just write the words on paper with white vinegar. After that, you won't see anything. When you want to read it, you can see it clearly with fire. From the beginning, I found white vinegar and paper and started the experiment! I laid the paper flat on the table first, then dipped my hand in white vinegar and wrote the words "See you in the park". As soon as I finished writing, I couldn't wait to take it outside to dry, waiting anxiously ... Finally, the white vinegar on the paper dried up. I can't see anything outside. I brought a lighter and carefully put the secret letter on the fire to bake. I didn't expect the words in brown to appear clearly on it. How interesting! However, why is this? I got the answer online. It turns out that the acetic acid in white vinegar will slightly corrode the fiber of paper, making it easy to be burnt at high temperature. Under the flame baking of a lighter, the corroded place is more likely to be burnt than the non-corroded place, so the brown handwriting is actually a slightly burnt color.
This little experiment not only exercised my practical ability, but also made me understand a scientific principle. This is really an interesting experiment!