In real life or work and study, when it comes to composition, everyone must be familiar with it. Compositions can be divided into time-limited compositions and non-time-limited compositions according to different writing time limits. Have no clue when it comes to writing an essay? Below are 400-word essays on interesting experiments that I have collected and compiled. They are for reference only. You are welcome to read them. Interesting Experiment 400-word Essay 1
In science class, the teacher gave each of us a balloon, and everyone couldn't help blowing it up. Phew, I accidentally shot up the big balloon into the sky, and then fell to the ground weakly.
The teacher on the side suddenly said: "Why does the balloon fly?" I frowned: "It's because the gas inside spurts out backward, pushing the balloon." The teacher then asked: "The gas spurts out." What does the direction of the balloon have to do with it? "On the contrary." "We call this force the recoil." "Of course!" We are all eager to try! .
I looked carefully and found that there was a short pipe on the car, one end was larger and the other was smaller. The experiment begins. We first put the mouth of a balloon on the big mouth of the tube on the trolley, put our mouth to the small mouth, puffed up our cheeks, and blew hard to blow the balloon big. We held the blowing mouth with our hands to prevent the air from escaping. Then he put the car upright, released his fingers, and the gas in the balloon suddenly shot out backwards, and the car rushed forward quickly. It really felt a bit like a rocket taking off. "Success!" Everyone cheered. Later, we also set up a 45-degree slope, and it rushed over easily.
When I got home, I told my dad about this interesting little experiment I did at school. My dad added: "In life, there are many things that use the principle of recoil. There is a kind of firecracker "Flower", when the gunpowder burns rapidly and the generated gas is ejected from the lower end of the flower tube at a very fast speed, the flower tube itself rises upward. In nature, some animals can also do this. Use the recoil to escape!
A small scientific experiment can gain so much knowledge. No wonder the teacher often says to me, "Practice brings true knowledge"! 400-word essay on interesting small experiments 2
This morning, I was sleeping, and suddenly there were several urgent "ding-ring-ring" phone calls, and I had to call my mother to answer it.
I was awakened by the phone and had no choice but to wake up. Suddenly, a neat row of words appeared in front of my eyes: Why can I hear the other party’s voice clearly when I’m on the phone?
After breakfast, I asked my mother. This question came up. My mother told me the reason for this problem, but I didn’t understand it for a long time. My mother said, “Okay, let’s do a little experiment. You go find two cans and a long string. "As soon as I heard that I was going to do a small experiment, I suddenly became energetic, found two cans and long cords and gave them to my mother.
My mother found a hammer and an iron nail from the parts box Let me do what she said. I first carefully removed the lid of the can, used a hammer and a nail to drill two small holes in the bottom of the can, and then inserted the two ends of the long wire into the small holes at the bottom of the two cans. hole, and finally tied a small knot on each end of the long wire to make it strong. Looking at the completed "telephone", I couldn't wait to pick it up and use it, and asked my mother to put the can into my ear to listen to me say a few words. However, mother. I always said I couldn't hear it, so I picked up the "phone" dejectedly and looked at it several times, and tried a few more times, but, yes! Seeing my helpless look, my mother said to me: "Stretch the rope straight." Try again. "I tried it again, and sure enough, I finally succeeded.
Through this small experiment, I suddenly realized that speaking into the microphone caused the metal diaphragm at the bottom of the microphone to vibrate with the sound, and there was a vibration. The magnetic reed vibrates, causing an induced current in the electromagnetic coil. The current is transmitted to the receiver through the wire, causing the diaphragm on the receiver to vibrate accordingly and restore the voice.
This is really an interesting little scientific experiment, which has benefited me a lot. Real knowledge comes from practice! Interesting little experiment 400-word essay 3
Yesterday I watched the program "Happy Camp", which lasted for two hours. After about an hour of the program, the exciting moment finally came - the last activity of Happy Camp: "Ahhhhh Science Experiment Station". In this activity, there are many experiments, such as chemical ice cream, etc., but what I am most looking forward to is the terrifying experiment on people.
Here’s how to do it: 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. When I saw this scene, I opened my mouth in surprise. This experiment is really fun. I really want to try it myself!
Let’s do it. First, I will find a pot of boiling water that grandma has just boiled. But how should I get the air conditioner? Ah, yes! I opened the lower shelf of the refrigerator, took out some ice cubes, and put them in an empty bottle. When the cold air was enough to fill the entire bottle, I found another bottle and covered it with the cold air filled bottle. Then I brought the pot of hot water, stood on a high place, and slowly poured the hot water onto the glass bottle from top to bottom. When the hot air meets the wall of the glass bottle filled with cold air, a stream of white water vapor comes out. Oh, it turns out this is water vapor!
This experiment turns out to be based on the principle of thermal expansion and contraction, as well as the rising of hot air and the falling of cold air. It is really interesting. Come and try it! Interesting Experiment 400 Words Essay 4
In Friday’s math class, we did a very interesting thing: burning sugar. When I heard the name of this experiment, I was very curious and thought: What will the sugar look like when it burns? Is it white or black? Is it dry or wet? ...wonderful ideas appeared in my mind one by one. After listening to the teacher's key points of the experiment and the key points to be observed, we started to do the experiment.
With a "click", the match lit up, and we quickly lit the candle. Since we were burning sugar with candles, we put a napkin underneath to prevent the wax from dripping onto the table. Before burning, the sugar is white particles, but after only burning for a while, it changes. At first, the sugar began to melt and bubbles were still bubbling. After a while, it expanded, turned earthy yellow, and kept bubbling, and the bubbles got bigger and bigger. "Puff" a bubble burst. Another bubble popped up, like a volcano 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 the sugar in other groups was burning, we ran over to find out what was going on. It turned out that they tilted the spoon so that the black stuff on it came into contact with the outer flame. After a few seconds, the sugar started to burn. But we didn't pay attention to control the direction of the flame, and the flames jumped to the napkin, which only frightened us. After a frantic rush to put out the fire, the fire went out and the candle went out. Looking at the candle again at this time, I saw that it had become much shorter and the wax no longer evaporated. The burned white sugar in the spoon was jet black, completely different from its previous appearance, and was so brittle that it would break when poked with a pen.
Through this experiment, I learned what white sugar looks like after burning, and learned a lot of knowledge that cannot be known without experiments. This is a meaningful experiment. Interesting Experiment 400 Words Essay 5
My homework has been finished today. I was bored, so I took out a book from the bookshelf and read it with interest. Suddenly I saw an experiment, and I Want to try it myself.
So I took the experimental materials and conducted the experiment: I first filled 3/4 of the water in the Coke bottle, then inserted a straw into the water, and then inserted a curved straw into the bottle. Next, I plugged the mouth of the Coke bottle with soaked tissue paper to seal the Coke bottle. Finally, I followed the instructions in the book and blew hard on the straw that was not in contact with the water. Guess what? The water turned out to be like As the book says, it squirted out of the curved straw.
After completing this experiment, I was very curious, "Why did the water spurt out of the Coke bottle?" For this matter, I specifically checked online, 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 of the other straw, forming a fountain.
After understanding this, I was very curious and thought if I. Instead of blowing, how about sucking? I did another experiment: the water in the bottle started to bubble, so I checked the computer again, and then I realized that the air pressure in the Coke bottle became smaller after inhaling. , 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 this, and she said to me after hearing it. “Doing more small experiments will be very helpful to you. ” 400-word essay on interesting small experiments 6
This afternoon, our school held a small science and technology experiment competition. Everyone was in high spirits.
When we arrived at the gymnasium on the third floor, we found a seat to sit down. , waiting for the start of the game. The game started, first was the performance of "The bottle is flat" by Class 5 (1), followed by the performance of Class 5 (2). After a while, our class came on stage, and the students were all excited. Xin Bochao and the others cheered. The small experiment done by Xin Bochao and Kang Youhua is called: "The Magic of Air Pressure". The required materials are: a bowl of water, a plate, a glass, a bottle of ink, a candle and a lighter. Xin Bochao was responsible for explaining, and Kang Youhua and Xin Bochao's mother were responsible for the operation.
First, Kang Youhua poured water into the plate, inserted a candle, and lit it. Then, he added a few drops of ink, and then, Cover the candle with the glass. After a while, the water actually rose. The students were all stunned. Then, Xin Bochao confidently said: "The principle of this experiment we did is that when the candle burns, it needs oxygen. When the cup When the candle is covered, 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 he finished speaking, Kang Youhua carefully held the plate to show the judges the magic of air pressure. Then, we also watched the sixth grade's small experiment, which was very exciting...
After watching this competition, I Got it: Science comes from our lives. As long as you look at things with an inquiring eye, you will find more interesting things! 400-word essay on interesting experiments 7
Today, Teacher Xiao Liu brought a candle When I came to class with a plastic can, am I going to do another experiment? When I was puzzled, Teacher Xiao Liu smiled and said, "Let's do an experiment today! "What experiment?" "I couldn't wait to ask. Teacher Xiao Liu said kindly: "The candle went out. ”
Let’s help Teacher Liu push the table to the middle, and start as soon as we say we’re going to start, open the plastic can, and take out the lighter. At this time, I was scared and didn’t dare to let Teacher Liu light a fire. But the lighter The alcohol in it seemed to be saying: "Quick, quick, set us on fire. "We watched Teacher Xiao Liu lighting the fire. I squatted down and stood up to watch. Ni Yihan kept shouting: "Teacher, we can't see, teacher." "I asked Xiao Ni to come to my high-definition video. After a while, my place was also blocked, so I had to change the 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 need." "The teacher slowly put the candle on the table. I was worried that it would burn Teacher Liu. Then he put the lid on the candle and extinguished it. Zhu Ziyu explained the reason. If there is not enough air, the candle will "suffocate to death." The candle needs oxygen to burn. .
In this experiment, I understood that oxygen is needed for combustion. At the same time, it also made me realize that we should observe more and think more about interesting experiments in our daily life. 400-word essay 8
Continuously add salt to a cup of hot water and stir with chopsticks until the salt no longer dissolves. Then take a piece of cotton thread 20 to 30 centimeters long and tie a paper clip to one end. , then immerse the cotton thread in concentrated salt water for a few minutes, take it out, clamp the cotton thread with plastic clothespins and hang it up to dry.
Soak the dried cotton thread in concentrated salt water, take it out and dry it, repeat this many times.
Okay, now you have a special treated cotton thread. Since the appearance of this cotton thread is not much different from ordinary cotton threads, you can invite children to watch when you perform the following experiment, and they will definitely applaud your "magic".
You can tie one end of the special cotton thread to the wire and let the end with the paper clip hang underneath. Then, you can first ask the children: "What will happen if I use a match to burn this cotton thread?" The child's answer is exactly what you expected - "Of course it will burn." At this time, you can Use a lit match to light the lower end of the cotton string. The flame will burn upward slowly as everyone imagines, until it reaches the wire and goes out. Your children will soon scream: "Wow, this burned cotton thread is not broken, and the paper clip is still hanging there!
Now, you can reveal this "magic" to your children "Mystery. You can also tell them the scientific principle: the special cotton thread is full of salt crystals. After being ignited, although the fibers of the cotton thread have been burned, the salt with a melting point as high as 800°C is not affected, so it can still maintain The cotton thread has its original shape and looks like it has not been burned. Interesting Experiment 400-word Essay 9
There are many mysteries worth exploring in life. I have done many small experiments. Experiments, but the most interesting thing is the experiment of sucking up small pieces of paper when a ruler is rubbed on the hair.
One day, I had nothing to do and suddenly came up with it. I have a weird idea. Anyway, I have nothing to do, so let me do a small experiment. First, I opened the newly purchased 100,000 Whys to see if there is any interesting experiment. In my sight, the ruler could absorb small scraps of paper after being rubbed on my head. I couldn't wait to take a ruler and rub it on my hair, and then cut the paper into small pieces. Then I placed the ruler next to the scraps of paper, but found that the ruler did not touch the scraps of paper, but the small scraps of paper consciously "jumped" onto the ruler. Why was this? After thinking hard for a while, I realized that the ruler was actually a ruler. After rubbing with hair or leather, it carries many invisible charges. These charges like to attract small objects, so the charged ruler attracts the small pieces of paper.
Listen to me. Introduction, you must find it very interesting to do experiments! Then let us go into the vibrant nature and discover more scientific secrets that no one knows! 400-word essay on interesting experiments 10
Recently, I was reading a book called "The Witch's Carnival Night" from the Adventure Tigers series. The last few pages of the book were full of science experiments.
That day, I read the entire book. After reading the book, I couldn’t help but sigh: “Ah! So exciting! "Then, I turned to the next page, which read: Secret records of the Little Tigers. Secret records? What secret records? My curiosity drove me to see what happened. I continued to turn down and read all these pages. It was over. I was interested in nothing but one: the secret letter without ink. I read it several times. I thought I should do this experiment. The first step was to prepare two pages. Paper, a pencil and a piece of glass. I quickly tore off two pieces of paper from the notebook I was copying and took out a pencil. As for the glass, let’s get ready! Soak a piece of paper in water, then pick it up and spread it on the glass, then cover it with the dry paper, and then write your information with a pencil. I'll do it in a flash. Come and see the results. Now! I soaked the paper in water, and the writing appeared! Although I don’t know what happened, it’s so amazing and interesting!
Now science is so amazing! My scientific knowledge is not very rich, so I must learn some knowledge! Interesting little experiment 400-word essay 11
Today I am going to do an interesting little scientific experiment on the magical power of chopsticks.
Of course, materials are indispensable for conducting experiments. I couldn’t wait to prepare the experimental materials: a plastic cup, a cup of rice, and a bamboo chopstick. First, I poured the rice into the plastic cup, pressed the rice in the cup with my hand, then pressed the rice in the cup with my hand, inserted the bamboo chopsticks from the middle of my fingers, and then gently lifted the chopsticks with my hands, but the cup and The rice was not mentioned. I tried a few more times without success. What's going on?
I took my dad’s mobile phone and looked at the experimental principle, and then I suddenly realized it. It turns out that chopsticks can lift the cup and rice because when you press the rice with your hands, the air inside the cup is squeezed out. The pressure outside the cup is greater than the pressure inside the cup, making the chopsticks and rice tightly combined. Chopsticks You can lift the cup filled with rice. The reason 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. While pressing, I thought: This time I must squeeze the air out of the quilt. Then I inserted the chopsticks gently, and finally I lifted the chopsticks lightly haha! I finally succeeded!
Through this small experiment, I understood a truth: Don’t give up easily when encountering difficulties in anything, use your brain to think more, think of ways for success, and don’t make excuses for failure. Interesting little experiment 400-word essay 12
Today, the teacher did a little experiment for us called "x eggshell disappeared". The moment I saw the experimental results, I was extremely surprised. I felt that the teacher must have cast magic on the eggs. I wanted to try it myself!
I first prepared a raw egg, a bottle of white vinegar, and a glass. Then wash the raw eggs, put them in a glass, and then pour white vinegar into the glass until the eggs are submerged. Immediately afterwards, you can see that the egg is wrapped in many small bubbles!
A day later, the shell of the egg disappeared, and a layer of soft skin floated in the cup. Then take the eggs out of the cup, clean the impurities in the cup, and then soak the eggs in white vinegar.
After another day of soaking, after the eggs were taken out, washed, and dried, there was a soft, translucent film on the outside of the eggs. The egg feels soft and elastic, like a translucent bouncy ball.
When I went to bed at night, I put it next to my pillow. I put the flashlight under it at night, turned on the power, and the egg glowed! I thought: I’ll name it Ye Mingzhu!
The next day, I asked my dad why the egg shell disappeared? Dad said: "Egg shells contain calcium carbonate, and the main component of white vinegar is acetic acid. When the two are put together, they will react chemically to produce water-soluble substances and carbon dioxide."
It turns out that egg shells are made of The white vinegar is dissolved. Science knowledge is so interesting! Interesting Experiment 400-word Essay 13
A few days ago, I was in science class, and the teacher asked us to prepare a small light bulb, an AA battery, and a few wires. After I got home, I asked my mother to find me a small light bulb. Then I took out the wires and batteries and started doing this experiment.
First, cut off a little of the skin on both sides of the wire to expose the metal wire inside. Then tie the wire to a small bulb, place the other end of the wire on the "-" pole of the battery, and place the small bulb on the " " pole of the battery, and the small bulb will light up. , "Ah, the little light bulb is on! It's finally on!" I cheered happily, and my heart was filled with great pride. I wanted to test whether another small light bulb could also light up, so I replaced the small light bulb on the wire. It turned out that the small light bulb was only a small part of the wick and emitted a faint light, just like a firefly using the light from its tail. Bright. I found 3 more batteries, connected them in series, and tried again. The small light bulb was very bright. I bought two more batteries and added them to make the little bulb brighter. As a result, the little bulb suddenly sparked and the light went out. I was feeling very depressed at this time.
What's going on? I couldn't figure it out, so I asked my dad. Dad drew the experimental diagram clearly on the paper.
Through the drawings, I finally learned that the voltage of the battery must be the same as the voltage of the small light bulb. Only when current passes through the filament can the small light bulb light up. If the positive and negative poles of the battery are directly connected, a short circuit will occur.
This interesting experiment has increased my scientific knowledge a lot. Interesting Experiment 400-word Essay 14
Electricity has many uses. It can be used in lamps, air conditioners, mobile phones, and can also make something rotate. I thought to myself, "What else can electricity be used for?" What? "So I did a compass experiment.
I first prepared two round one-yuan coins, a thin toothpick, and a thin, long, and smooth straw. After preparation, I put the materials on the flat table and couldn't wait to start the experiment.
I put one of the coins with the smoother side facing up, flat on the table, and then placed the other coin vertically on it. He was like a naughty child, not obedient at all. I tried After trying again and again, I finally succeeded in putting the coin up.
Next came the most critical moment. I carefully placed the toothpick on the two-millimeter-thick coin. Although I was careful, it still fell off, but I was not discouraged and kept putting the toothpick on it. On the coin, I remained motionless and even my breathing became soft, for fear that if I blew hard, all my previous efforts would be wasted. I took a soft towel and a straw, wrapped the straw tightly with the towel, and rubbed it hard. After repeated rubbing for about fifty seconds, I gently brought the straw close to the toothpick. Something magical happened. The toothpick seemed to be under magic. , rotate together with the straw; when the straw moves to the left, the toothpick also moves to the left; when the straw moves to the right, the toothpick moves to the right. It is like a majestic conductor. The experiment I did was successful, and I felt happy!
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 magic wand. There are many other secrets in life, which we need to discover and explore ourselves. Interesting little experiment 400-word essay 15
As soon as I saw the word "interesting", I couldn't help but think of the interesting little science experiment I did at home.
I remember it was when I was in the fourth grade. I read a book called "Adventure Little Tigers" and learned about the method of making secret messages in it. I couldn't calm down for a long time. I thought to myself: How interesting this is! If I learn this method, I can write my own little secrets on it. The method of making a secret letter is very simple. Just write the words on the paper with white vinegar. After it dries, you will not be able to see anything. If you want to read it, it will be clear after you bake it with a fire. Just do it, I immediately found white vinegar and paper and started experimenting! I first spread the paper flat on the table, then dipped my hand in a little white vinegar and wrote the words "Meet in the Park". As soon as I finished writing, I couldn't wait to take it outside to dry, and waited anxiously... Finally, the white vinegar on the paper dried. No writing can be seen at all on the outside. I brought a lighter and carefully placed the secret letter on the fire to heat it. Unexpectedly, the brown words appeared clearly on it. It's so much fun! But why is this? I got the answer online. It turns out that the acetic acid in white vinegar will slightly corrode the fibers of the paper, making it easy to be scorched by high temperatures. When baked by the flame of a lighter, the corroded areas are more likely to be scorched than the non-corroded areas, so they turn brown. The writing is actually a slightly burnt color.
This little experiment not only exercised my hands-on ability, but also allowed me to understand a scientific principle. It was really an interesting experiment!