In daily study, work, and life, everyone often comes into contact with compositions. Compositions require a complete chapter structure, and compositions without endings must be avoided. In order to make it easier and more convenient for you to write essays, the following is an interesting 400-word experimental essay that I carefully compiled. I hope it will be helpful to everyone. Interesting Experimental Essay 400 Words 1

Let me tell you whether eyeballs will float or sink in water.

Kuangtian, the teacher took us to do an experiment. The materials include eggs, water, salt, transparent water cups, etc.

The teacher carefully placed the egg in the cup. The egg sank like a sleeping baby. The teacher fished the egg up, added some salt to the cup, and stirred it with a spoon. , the turbid water slowly became clear again. The teacher carefully put the egg in for the second time, and the egg sank again. We laughed happily, "Teacher lied to us! The egg didn't float up!" The clever guy said, "That's because there is not enough salt." The teacher. I added some more salt, stirred, and after a while, put the eggs in. Finally, the eggs floated like a baby waking up. The students shouted: "The egg floats!" The teacher pressed the egg down with a spoon, and the egg floated up again, as if to say: "Don't push me down, I want to see the wonderful world."

It turns out that what makes the egg float is the levitation force, and the principle of buoyancy is: when the water molecules are smaller than the molecules in the egg, the egg sinks. When a lot of salt is added, the molecules of salt water are larger than those in the egg. If the molecules have greater buoyancy, the eggs will float.

There are many mysteries in nature, waiting for us to explore! Interesting Experimental Essay 400 Words 2

In science class, my classmate Wang Yuanyuan and I did a very interesting experiment - a "volcano" eruption.

Our table is filled with materials needed for the experiment: volcano mold, baking soda water, citric acid and syringe.

I spent a lot of effort to open the volcano mold. Wang Yuanyuan tore open the bags of baking soda water and citric acid, and carefully poured them into the "volcano" for fear of splashing a little water.

"The next step is to fill the syringe with water. Leave such a piece of cake to me! And leave the terrible thing of making the volcano angry to my classmate Wang Yuanyuan, haha!" I Secretly happy.

When I expressed my thoughts, I looked at my classmate and saw a smile on her face, and she said cheerfully: "Okay!" She took it as she said it The syringe in my hand has been filled with water. "Hey! Am I a little too selfish? But it's too late to regret now." I thought guiltily.

The exciting time has come, the "volcano" is about to erupt! I saw the water in the needle slowly flowing into the "volcano".

"Huh? Why hasn't the volcano exploded yet?" So, I took a closer look. With a "bang", the "volcano" erupted! I was so scared that my heart almost jumped out of my chest!

The experiment was over, and my classmates and I laughed at each other! Interesting Experimental Essay 400 Words 3

Spring is the peak season for silkworm rearing. Our class also set off a "sericulture boom". Many students came to school with their beloved silkworm babies. The teacher said today that he would use silkworms for experiments, and the classroom seemed to be exploding.

The purpose of the experiment is to verify whether silkworms have vision and smell. The teacher announced the start of the experiment, and the stone in our hearts fell to the ground with a thud.

The teacher first asked the students for five silkworms and a few mulberry leaves. Then the teacher took out a box and put five silkworms in the corner of the box to see if the silkworms would look for mulberry leaves to eat. However, silkworms greatly disappointed us! They got entangled and started fighting. I really wanted to turn into a silkworm, run in and break up the fight, and push them to eat the mulberry leaves as soon as possible. About 20 minutes later, the silkworms were still spinning around in circles. After the teacher dispersed them, they unexpectedly got together again. The teacher had to bring the mulberry leaf closer. A silkworm saw it and ate it with great enthusiasm! Then, we used a magnifying glass to observe and found that the silkworm's head indeed had a pair of small black eyes, which showed that the silkworm had vision.

The teacher put the old mulberry leaves and the new mulberry leaves in different places, and many broad beans gathered at the new leaves. This also proved that silkworms can smell delicious food.

I didn’t expect that silkworms have eyes and can smell. This experiment allowed us to discover many interesting things. Interesting experimental composition 400 words 4

Eggs, salt, spoon, chopsticks, glass. Hey! What is Teacher Wu doing?

"Today we are going to do an experiment to make eggs float." Teacher Wu said. oh! So that's what happened.

I saw Teacher Wu picking up the glass with more than half a cup of water and carefully putting the eggs into the water. There was only a gentle "plop" sound and the eggs sank to the bottom of the cup. At this time, I thought: Oops! If you hit the egg so hard, it will break! Oh, fortunately, the egg was not smashed, but lay peacefully at the bottom of the cup and fell asleep. The students were a little disappointed.

At this time, Teacher Wu seemed to have read our thoughts. He suddenly picked up the spoon and put a spoonful of salt into the cup. I suddenly got excited and thought: Haha! Teacher Wu has an idea. Little Egg, give up now! You're going to float! After Teacher Wu added the salt, he picked up the chopsticks and stirred it. The water became turbid. As Teacher Wu stirred with his chopsticks, the eggs slowly floated up, like a beautiful dancer dancing in the water. However, as soon as the chopsticks were taken away, the dancer in the water seemed to have lost his partner and went back to sleep at the bottom of the cup. Teacher Wu continued to add a second spoonful of salt and stirred again, but the eggs still returned to the bottom of the cup to sleep. Like a naughty guy who stays in bed and just doesn't want to get up. When Teacher Wu continued to add the fifth spoonful of salt, the eggs slowly rose with the stirring of the chopsticks. Suddenly, there was silence in the classroom, and everyone shouted in their hearts: "Don't sink, don't sink!" Teacher Wu slowly took away the chopsticks, and the egg turned a few times on the water, and finally floated on the water. Got it! The classroom suddenly burst into cheers.

Through this pleasant experiment, I learned that the specific gravity density of salt water is greater than that of eggs, so eggs can easily float on top of salt water. Interesting Experimental Essay 400 Words 5

Today I went to class at Little Judeng School, and the teacher played an interesting experiment with us, called boiling eggs in paper cups.

The teacher first prepared a cup and some quail eggs. The small quail eggs were round and beautiful. The teacher also prepared an alcohol lamp and an iron frame. The equipment was ready, and it was time to start the experiment. The teacher first filled the paper cup with water, and then placed the round quail eggs in the paper cup. Then the teacher lit the alcohol lamp and placed it under the iron frame. Finally Put the filled paper cups on the iron stand, everything is ready, we just have to observe quietly.

Not long after, I noticed that white smoke started to come out of the paper cup. I walked closer and observed that there were small bubbles coming out of the paper cup. But the strange thing was that the paper cup was unscathed. Why? Woolen cloth? Looking at the continuously flying white smoke, the students were very excited. Some were afraid that the quail eggs would not be cooked, some were afraid that the paper cups would leak, and some were worried that the paper cups would be burned... About ten minutes passed. , the paper cup is still safe and sound. The teacher said: "It's almost done. The quail eggs should be cooked."

In order to verify whether the quail eggs were cooked, the teacher peeled off the quail egg shells, revealing the round egg whites. Like a big pearl, very beautiful. Then the teacher broke open the quail egg yolk. We all saw that there was yellow egg yolk inside. Our experiment was successful.

I really enjoyed this class. It was really an interesting experiment. I hope I can do it if I have the opportunity. Interesting Experiment Essay 400 Words 6

Yesterday, I was at my friend’s house and watched them do an interesting little experiment.

As soon as I got up this morning, I found the materials for the experiment: a little salt, a glass of water, an egg and a wide-mouth bottle.

We are doing experiments. Step 1: Pour water into the wide-mouth bottle first, do not fill it too full. Step 2: Put the eggs into a wide-mouth bottle. If you don't want the water to overflow, put it in gently. Step 3: Add salt.

When I put the first spoonful of salt, the eggs were still lazily with a big belly, as if they were sleeping in the sun on the beach. If the eggs don't make you feel like they're soaring in the clouds, add another spoonful of salt and see if it's better. If the egg makes you feel like it ascended to heaven, that means you've succeeded. When I put in the second spoonful of salt, the egg shook and floated.

"Great, I finally succeeded!"

Only then did I realize that my sister was also doing this experiment next to me. I saw her putting the eggs into a wide-mouth bottle and adding a spoonful of salt. The eggs shook for a while and then stopped moving. My sister continued to put in a spoonful of salt. The egg shook again and seemed to slowly rise. When it reached the middle, it fell again.

My sister said angrily: "If you don't come up to the surface, I'll let your parents cook you." Then she added another spoonful of salt, and the egg seemed to understand and floated up obediently. . The sister's face immediately changed into a smile, and then she said: "You are very obedient, but I still have to cook you." At this time, the egg sank again.

I couldn’t help it anymore, so I laughed "hahaha".

Today’s little experiment was so fun. We will do more interesting little experiments next time. Interesting Experimental Essay 400 Words 7

Today, the teacher said that we should do a small experiment by ourselves after we go home. The whole class immediately exploded with excitement, and everyone wanted to fly home right away. .

As soon as I got home, I couldn’t wait to prepare the materials for the experiment. First I bought a bag of white vinegar, and then I found a glass bottle and an egg at home. When everything was ready, I put the egg into the bottle according to the teacher's instructions, and then poured the vinegar into the bottle until the egg was submerged. until finally close the lid.

Less than a minute after putting it in the bottle, there were dense small bubbles all around the egg. And as it scrambles to rise, the thin outer layer of the eggshell begins to soften, and then slowly moves away from the egg.

The next day, the skin of the egg completely separated from the egg and floated on top of the egg, like a small umbrella specially held for the egg. Slowly, some light yellow stuff appeared in the white vinegar. On the third day, I touched it carefully with my hands. The egg was slightly soft, like a rubber ball. On the fourth day, another layer of skin began to float on the white vinegar little by little, like pencil foam floating on water. On the fifth day, a layer of soft broken skin floated on the egg. The egg was like a translucent glass ball, which made people want to take it out and play with it.

Through this small experiment, I understand that there are scientific mysteries hidden everywhere in life. As long as we observe more and work diligently, we will find more interesting things! Interesting Experimental Composition 400 Words 8

Today, Teacher Gao led us to do an experimental composition class, and we are looking forward to it very much.

The experiment began. The teacher told us that this experiment is to let paper hold water. I saw the teacher taking out a goblet and slowly pouring water into the cup. It was so full that it was almost overflowing. Then, he took out a piece of paper, carefully covered it, and then quickly turned the cup upside down. The water spilled out and the experiment failed.

Teacher Gao was unwilling to give in. He said, "Even if I run out of paper in the notebook today, I will still succeed in this experiment." After that, he tried it twice and failed. He did it again. This time the teacher was careful in every step, for fear of failure. After completing the last step, the water did not leak out. "Wow, teacher, it was successful! It's amazing." The students shouted. In order to verify that the experiment was really successful, the teacher took a cup filled with water and circled it around his head, but there was still no leakage. The experiment was really successful.

The teacher asked: "Who wants to come up and try this experiment?" I thought to myself: The teacher did it four times before succeeding, so don't we have to do it five or six times to succeed? Therefore, I doubt that anyone would dare to go up and do this experiment. But the reality was contrary to my imagination. The classmate next to me actually came forward and wanted to do experiments.

At the beginning of the experiment, the student first poured water into the cup, then covered it with paper, and then turned the cup upside down. The water did not leak. "Wow!" He succeeded the first time, better than the teacher. sharp. He sat back down, patted his chest and said, "The baby is scared to death." It turned out that he was also very nervous and scared.

What an interesting experiment this is! Interesting Experimental Composition 400 Words 9

In the weekly composition interest class, the teacher told us to do a very interesting little experiment in the next class. The students are all looking forward to the next composition class.

The day has finally arrived. "Ding ding bell, ding ding bell" the class bell rang again, and our eyes were fixed on the door. The teacher came in, holding a handbag in his hand. He first took out a transparent glass, a bottle of mineral water, a bottle of washing liquid, a sewing needle, a pair of tweezers, and a dropper from the bag. Go ahead, put these on the lab table one by one.

Start the experiment. The teacher first unscrews the cap of the mineral water bottle and pours clean water into the cup. After the water surface stabilizes, he carefully picks up the needle with tweezers and gently puts it into the water. Oh, the needle did not sink, but floated on the water. Then the teacher used a dropper to suck up the detergent and gently dropped the detergent into the water. In the blink of an eye, the needle quickly sank to the bottom of the water. Students, you look at me, I look at you. Why is this?

It was the teacher who solved the mystery for us: It turns out that there is tension on the surface of the water, and this tension holds the needle up. Pour in the detergent. The detergent dissolves into the water, reducing the tension on the surface of the water and destroying the film on the water surface. The needle will naturally sink to the bottom of the water.

Ah! How interesting. When I grow up in the future, I will definitely explore these interesting phenomena myself. Interesting Experimental Essay 400 Words 10

The lightness of spring brings the tones of the stream. Small goldfish come to the stream in groups to report. The cuckoos and tung trees on the side are also accompanying the tones of the stream. In bloom. The sun is reflected in the stream like a red balloon. The sky also looked particularly clear, and I was intrigued by the little goldfish.

Why did the little goldfish die?

I accidentally put a little goldfish in the sun. The little goldfish suddenly became less lively. As time passed, the little goldfish lost its vitality, but in the end it did not die.

This time I gave the little goldfish regular and rationed food, such as noodles, rice, and bread crumbs. Not only did the little goldfish not die, but it was still playing briskly in the cool stream. Isn't it afraid of holding on? There is no proof for each conjecture.

So, I put the little goldfish in a ventilated place. For about 10 minutes, the little goldfish seemed to have no strength. As time passed, the little goldfish finally died completely. I understand the reason why the little goldfish died: changes in temperature can cause the little goldfish to become uncomfortable or die.

Through this experiment, I solved one of the reasons for the death of the little goldfish.

Small goldfish are chore eaters and can eat processed foods. The little goldfish is closely connected with nature. We need it, and it also needs me. Nature and human beings are inseparable.

Interesting Experimental Essay 400 Words 11

Do you know what this small, red, wolfberry-like fruit is? The name of this small fruit is the miracle fruit, also known as the flavored fruit. It is native to West Africa, Ghana, and the Congo. I heard that this fruit is very magical. Today, my grandpa’s mystery fruit is ripe, so I picked one and used it for testing to see what magical effects it has.

First, I cut the passion fruit in half, picked up a spoon, scooped a little bit, put it in my mouth and tasted it. Oops, I spit out the passion fruit from my mouth like a reflex, why is it so sour! Then, I picked up a mysterious fruit that exuded a light fragrance and put it into my mouth and took a bite. Although it had no taste, it made people feel extremely refreshed. After eating the miracle fruit, I couldn't wait to stuff a mouthful of passion fruit into my mouth. Suddenly, I jumped up, oh my god! Why does this passion fruit become more sour! Seeing my embarrassed look, my grandpa standing aside couldn't help but said: "After eating the miracle fruit, you must wait three minutes before eating anything else, so that the miracle fruit can exert its magical effect, otherwise the sour food will only Becoming more sour. "Oh, so that's it. I had to wait patiently for another three minutes, then quickly stuffed a big spoonful of passion fruit into my mouth and chewed it, wow! Passion fruit actually becomes as sweet as honey!

I didn’t expect that the miracle fruit can turn sour things into sweet ones. I wonder if it can also turn bitter things into sweet ones? If possible, then we can plant many miracle fruits and give them to children who are fighting the disease, so that they can take medicine every day as if they are eating candy. That would be great!

This experiment allowed me to understand the magical effect of miracle fruit on turning sour things into sweet ones. It also made me realize that there are so many magical things in nature waiting for us to explore, discover and utilize. What a fun experiment! Interesting Experimental Essay 400 Words 12

One day, my friends and I were playing outside. Suddenly, we saw a group of ants busy. I had a flash of inspiration and remembered that ants seem to be very afraid of the smell of moth balls, so I wanted to confirm it and conduct a small experiment.

First, we caught two ants. A "starting line" was gently drawn in front of them. The two little ants turned around for a while, shook their little heads, and broke through the "starting line". Hey! How strange? Aren't ants always afraid of mothballs? Is there something wrong with moth balls? I picked up the mothballs, looked at them, smelled them again, and thought: There is nothing wrong with the mothballs! Is it not strong enough? No, I have to do another experiment. Out of curiosity, we caught two more ants.

As before, we drew a circle with mothballs, placed the ants inside the circle, and observed quietly. The two ants seemed to want to break out of this defense line, so they approached the "blockade line" step by step, as if to say: "Huh! You are so naive and underestimated that you still want to trap us with your little ability." Let's do it! Hahaha..." The ants were scurrying around in the circle, bumping into each other, really "ants on a hot pot, spinning around." After a few minutes, the tenacious ant was finally exhausted and lost its previous energy. It began to wander in the circle, slowly looking for a way out. Looking at the two poor little things, we couldn't bear it anymore and used branches to pick them out of the camphor ball circle.

Why are ants so afraid of mothballs? With puzzled questions, I immediately went online to look up information after I got home. It turns out that mothballs contain naphthalene or trichlorobenzene, which are highly toxic to insects, which is why ants are so afraid of mothballs. oh! So that’s it!

Oh! As long as we observe carefully, there is knowledge everywhere in life. Interesting Experimental Essay 400 Words 13

In the blue sky, the big sun shines on the ground, the clouds are turned light yellow by the sun, cicadas keep shouting, and there are almost no people walking on the road. If you don't hold an umbrella, there is an occasional breeze, which brings a bit of coolness to people in summer.

I came to the classroom and saw the teacher taking out two cups and several boxes of paper clips, and said, "We are going to do an experiment today." The teacher took a box of paper clips, poured them on the table, and put them on the table. A cup was handed over to a classmate and she was asked to get a cup of water. Then, the teacher asked me to go to the podium and put the paperclip into the cup filled with water. I walked up, picked up a paperclip, and gently , carefully put the paperclips into the cup. I saw the water rising millimeter by millimeter, and my heart lifted up little by little, almost to the point of my throat. Fortunately, I didn't... "Accident", a box of paper clips was put away, but the water was still safe. The teacher invited another classmate. She had the same expression as me, very nervous. She was breathing softly, for fear that if she moved, the water would fill up. The classmates all held their breath and opened their eyes wide because of the water. It was much higher, but later on, the water still wasn't full.

The teacher said that the surface of water has tension, which holds the water molecules together tightly. If a water molecule is about to fall, the water molecules in the middle will hold it tightly, and the water molecules will hold it tightly. The molecules can no longer fall. Oh, that’s what it looks like. What an interesting experiment.

Interesting Experimental Essay 400 Words 14

Today the science teacher said, "Science is endless, it is an eternal mystery. Let us do a bubble blowing experiment together today!"

The science teacher asked the team leader to come up and give each of us a small box of science supplies. A small bar of soap, a plastic cup, and a long straw. The science teacher said to us, "Surprise is the seed of science, let's get started." The science teacher gave us another instruction manual for blowing bubbles.

My deskmate and I were eager to try it, but we didn’t know how to start. My deskmate suddenly thought of something and said to me, "Didn't the teacher give us an instruction manual? Can't we just follow the steps above?" I said, "Yes, why did I forget the instruction manual?"

I followed the steps above. I first took out the water cup and poured some water into the plastic cup, then put the soap into the water, and then waited for the soap to melt. I dipped the long straw into water and blew hard. What blows out is not bubbles but water. I think a few more tries might work. I tried it over and over again several times, but the water still came out.

I tried blowing gently, and I really blew bubbles. Ah, my experiment was successful. the teacher asked us. "Do you want to know why soapy water can blow bubbles?" "Yes!" we said in unison.

The teacher told us, "Because soapy water can form a soap film, the soap film is not easily broken. When you blow air, the soap film will expand little by little. When it turns into soap bubbles, it will Like blowing up a balloon."

Ah, in this lesson we learned why soapy water can blow up bubbles. Interesting Experimental Essay 400 Words 15

Today we had a special Chinese class, which was to do experiments on silkworms.

The students listened and talked a lot. Some took out a few silkworms and teased them, some guessed what experiment to do, and some were looking forward to the teacher starting soon. Everyone's face was full of excitement. An expectant look.

The teacher first took out a box and borrowed five large and small silkworms from the students. Then he put the silkworms in one corner of the box and put the newly picked mulberry leaves in the other corner. We observed carefully for a while. Some silkworms looked around as if looking for food, some looked up at the sky as if looking for an exit, and some silkworms hugged each other as if they were playing. I thought to myself: "They are so stupid! They can't even see what they like to eat." The teacher brought the mulberry leaf closer, and one silkworm quickly pounced on it, and the other four slowly crawled towards the mulberry leaf. The largest silkworm Eat voraciously.

The teacher took out a magnifying glass again. In order to prove that silkworms really have eyes, the teacher invited Peng Zeyi to go up and observe. The students could not wait for the results. Some students even rushed to the podium, eager to take a look. after all. Peng Zeyi said calmly: "There is a black spot on both sides of the silkworm's head." I was very surprised when the teacher told us that these were the silkworm's eyes.

So do silkworms have a keen sense of smell like other animals? The teacher put the fresh mulberry leaves and the old mulberry leaves on one side. Originally, a silkworm was going to eat the old mulberry leaves, but when it smelled the fresh food on the other side, it quickly turned around and went to eat. It seems that the "nose" of the silkworm is also quite smart. !

The bell rang for the second period. I looked up and saw that the silkworms were lined up neatly, like a silkworm army marching forward. During the two classes, only a big mulberry leaf was eaten. Scumbag.

This experimental class not only taught me that silkworms have eyes but also a sense of smell. I love this interesting experimental class.