Paper can hold water essay

In our daily study, work and life, everyone has probably dealt with composition. Through composition, we can gather our scattered thoughts together. Have no clue when it comes to writing an essay? The following is a collection of essays on paper that can hold water that I have collected for your reference. I hope it can help friends in need. "Paper can hold water" essay Part 1

"Paper can hold water" is incredible. No matter how I hear it, I don't believe it is true. An ordinary piece of paper can actually hold a glass of water. I don't believe it to death, but it is indeed true. Things have to start from the beginning.

I remember it was one afternoon during the winter vacation. I was concentrating on reading a book about scientific production. Suddenly, a line of eye-catching words came into my eyes: "Paper that can hold water". Isn't this? Maybe, it's just a fantasy. Out of curiosity, I always loved challenges and did the experiment according to the instructions in the book. First prepare a glass, a flat piece of paper and some water. First pour some water into the glass, then slowly cover the rim of the cup with flat paper so that the paper and the rim of the cup are tightly bonded, and then quickly turn the cup upside down. At this time, something unexpected happened. The water flowed out "unceremoniously" and spread all over me. Hey, what's going on? Did I follow the steps in the book? How could it not be successful? Thinking that Edison was not discouraged after tens of thousands of failures in inventing the electric light, what does my setback mean? Wouldn't it look too cowardly of me to just give up like this? The hard work paid off. After consulting the information, I finally found the reason for the failure: the cup should be filled with water, occupying the entire space of the cup, but I only filled half a cup of water and half a cup of air, so the water fell out. down. Paper can only hold water if there is no air in the cup. After I understood this principle, I tried the experiment again, and this time it was successful. Not only did the water not flow out, but it was also held firmly by the paper.

This experiment was so interesting. It not only allowed me to experience the loss of failure, but also allowed me to taste the joy of success. It also introduced me to the palace of scientific exploration. Paper Can Hold Water Essay Part 2

Only when you use your hands and brain can you create something. The magic of water, the mystery of ants, the existence of static electricity... let us travel in the ocean of science together!

"Paper can hold water!" Isn't this sentence incredible? Some students said: "It is impossible for a piece of paper to hold water. Are you kidding a child?" I don't think so. I think only experiments can let us know what is right and what is wrong, so I am going to do this experiment.

I learned this experiment from my brother who is in eighth grade. He told me to prepare three things before doing this experiment: a thin piece of paper, a small paper cup, and water. . I started to doubt my guess when I heard my brother talking about a thin piece of paper. He said: "Now fill the cup with water, seal the mouth of the cup with a piece of paper, and then turn the cup upside down. Huh? The water bursts. The piece of paper fell out and flowed out. I was very disappointed and felt that my inference was wrong. My brother was also puzzled. He thought: I succeeded last time. How could I fail this time? After a while, he hurried over and said to me: You did it wrong, you didn't fill it with water, so I did it again, and it was successful. I finally made those who thought the water would flow The classmates who came out and opposed me saw that they were wrong, and they were able to prove that my conclusion was right.

In the evening, when my parents got off work, I filled the cup with water. Seal the mouth of the cup with paper, wrap the remaining paper cup with your hands, and then turn the cup upside down. Not even a drop of water flows down. My parents smiled at me, and my brother looked at me approvingly.

But why did the water flow down in the first experiment? I checked on the Internet again and finally found the answer: It turns out that when the water cup is filled with water and covered with paper, the atmospheric pressure in the cup is lower than that outside the cup. Atmospheric pressure, the atmospheric pressure outside the cup presses the paper, and the water cannot flow out. But if it is half a cup of water, there is still half a cup of air, and the atmospheric pressure outside the cup is less than the atmospheric pressure inside the cup, so the water flows out of the paper. Can Hold Water Essay 3

"Can paper hold water?" The students were discussing this. In order to verify whether it is true or not, I decided to go home and do this experiment.

The materials that need to be prepared are very simple and are generally available at home: A5 size paper, glass cups, water and buckets.

I first filled the glass with 3/4 of the water, then placed the bucket on the table, and placed the glass on a flat surface of the bucket to prevent the water from "escaping" out, and then put the small The A5 paper was slowly placed on the cup, gently stroked back and forth, and finally the cup was quickly turned upside down. I thought: It will definitely work! In the end, I only heard a snap, hey! The water fell into the "bottomless pit" of the bucket; the paper fell into the water and began to dance, as if laughing at me, "You really shouldn't Proud!" As for me, I didn't know whether to laugh or cry. "It's true to that sentence. Pride makes people fall behind! But let me try again. Failure is the mother of success."

The second time, I put it down. The glass is filled with water. Looking from the side of the glass, you can see a flat semi-oval shape. I followed the steps above and redoed them, even more carefully. This time, the paper finally stuck to the glass. I counted it more than a hundred times before it was unwillingly put into the "water torture chamber" by me.

Later, I searched on Baidu and found out that the failure was because the cup was not filled with water and there was still air. The success is because the cup is filled with water, air cannot enter the cup, and atmospheric pressure holds the water through the paper. " Paper Can Hold Water Essay Part 4

As the saying goes, "When people go to higher places, water flows to lower places. "However, today I witnessed it with my own eyes in an experiment: the water did not flow downwards, just because of a piece of paper!

This experiment was completed by my mother and I together. The materials are very simple: two pieces of ordinary A4 paper, a glass, a basin of water and a thick needle covered with a quilt. Before the experiment, I was full of my mother's so-called "experience". I don't believe it. Let the paper "hold" the water? Are you kidding?

My mother ignored my question and just said, "Don't worry!" You will believe it later. "After that, she asked me to fill the cup with water, but I only filled it seventy percent. My mother said no, it must be completely filled. I said, "If you fill it too full, won't the paper be more likely to be soaked? "My mother insisted, so I could only do it. After filling it, my mother brought a piece of paper, covered it, and then quickly and without hesitation turned the bottom of the cup over. A scene that stunned me happened, I saw that the water did not pour down after being turned over, but was firmly "held" by the paper! After a long tens of seconds, it fell together with the paper.

When I understood what was going on, my mother took another piece of paper, held the symmetrical sides of the paper, and asked me to poke holes in it. I made twenty or thirty small holes in my heart. , although I was shocked by the facts just now, I didn’t think that the paper that was riddled with holes could bear this “heavy duty”. However, the facts once again shocked me: such paper could actually “support” it again. It even lasted longer than the intact paper.

Afterwards, my mother finally told me the principle: it turns out that after the water fills the cup, it will absorb the water in the cup. The air is squeezed out, and the paper can block the outside air. In this way, a sealed space is formed, so the water will not pour out!

But, you know, the paper quilt. Is the reason why the water still won't pour out after poking many holes? Because the size of each small hole is smaller than the volume of a drop of water, so even if there are many small holes, the water cannot drip out, and it is still a sealed space!

Such an incredible phenomenon actually hides such an interesting scientific truth! How awesome! Paper Can Hold Water Essay 5

Why are there so many in Classroom 8? Laughter? It’s so strange. Is it a cross talk, or is there a vegetable market in the class, and everyone is rushing to buy food? NO! Please come with me to find out.

The teacher looked at the students with a smile and said, "Today, we will do an experiment. Paper can hold water!" The students started talking about it: "What, paper can hold water?" "What a big joke!" "Sure, I've done it!" I thought: "Can paper also hold water?" It’s incredible! "But the teacher is a teacher after all, and he must have rich experience, so I have to believe it.

Otherwise, if the teacher becomes so "arrogant", wouldn't I become that soaked paper? Seeing the students "telling the truth" with great joy, the teacher just smiled mysteriously and started this amazing experiment.

For the first time, the teacher brought a red bucket and half a piece of white paper. The teacher put the bucket on Chai Zhiyan's table and said, "Chai Zhiyan, put the paper and notebook in quickly." Chai Zhiyan immediately obeyed the order and hurriedly put the book and paper into the drawer, for fear of putting these two innocent people The "little baby" got wet. Zhou Yazhenyi curiously poked her head over like a newborn baby, wanting to see what was going on. But the teacher stopped her like a policeman and said, "Don't peek! You little guy." She could only go back in despair. The teacher first took a cup with half-full water in it. Then she covered the half piece of paper on it and said, "This is the moment to witness the miracle!" The students shouted together: "One, two, three, pour it down." !” The teacher poured the water glass suddenly, wow! All the water and paper in the water cup fell away. The class was quiet for a second, and then burst into laughter. The teacher's face was full of surprise, as if he was wondering why the experiment failed. After a while, she told us: "Because the water was not full, air entered the cup, and the atmospheric pressure generated rushed the water and paper into the bucket." Everyone suddenly realized.

The second time, the teacher looked eager to try. I saw the teacher pour a full glass of water, put the white paper on the cup, and started counting: "1, 2, 2.1, 2.2, 2.3, 2.4...2.91, 2.92, 2.93...2.99, pour it!" But the water and paper fell into the bucket again. It turned out that the counting time was too long, the water soaked the paper, and air got in again. fail!

For the third time, the teacher filled up the water, placed the paper, and flipped the paper and water cup over with a "swish" sound. Sure enough, two to one was no more than three, and the experiment was successful!

The teacher said that because the cup is filled with water, there is no air and air pressure. The atmospheric pressure outside holds the water and paper. This experiment is so interesting! Paper Can Hold Water Essay Part 6

Do you believe that paper can hold water? I don't believe it! Today, Teacher Zhou revealed the answer to us in class.

"Paper can hold water." Teacher Zhou wrote five big words on the blackboard. The quiet classroom suddenly became lively and the students started talking about it. I stared at Teacher Zhou with confusion on my face. She took out a bright red plastic bucket, and then took out a cup filled with more than half a glass of water. Next, Teacher Zhou put a piece of paper on the cup and raised the cup high. The students held their breath one by one, stretched their necks, and stared at the teacher intently. Wait for the teacher to turn the cup upside down. One, two, three, before Teacher Zhou finished speaking, the cup turned upside down made a fool of itself, and the water washed the paper into the bucket. Fortunately, there was a bucket to catch it, otherwise the students in the front row would have suffered!

"Let me just say, this is impossible." The tweeter at the same table sounded. "No, no, Teacher Zhou failed in his performance." Another student retorted... The classroom seemed to explode, and everyone started talking about each other. I couldn't help but laugh secretly: It's just nonsense, paper How is it possible to hold water?

Teacher Zhou said calmly: "Students, failure is not terrible. Failure is the mother of success. What is the reason for this failure? Because the cup is not filled with water. , the air got in. Can we do it again? "I understand, Lao Zhou did it on purpose.

The second experiment is about to begin again. Classmate Chai sitting at the first table is so funny. The scene just now scared him so much that water splashed on him. In order to prevent him from "suffering" again , he put the clothes on his head. The advantage of this was of course that he would never "shower" passively again. As for classmate Zhou Yazhenyi, her eyes were round and round, but she could not help but move towards Teacher Zhou. She wanted to take a closer look, but was "mercilessly" sent back to her position by Lao Zhou. If the students in front are all surrounding Lao Zhou, how can the students in the back observe? Look, Lao Zhou picked up the cup unhurriedly and saw her filling the cup full of water. Look at Lao Zhou's calm demeanor, this experiment must have been a success! But the result was unsatisfactory and it ended in failure.

At the end of the experiment, there were bursts of sad sighs in the classroom...

But Lao Zhou showed a proud smile on his face and said: The second time failed because the paper had been left on the water for a long time and became damp. The air has entered, so the water cannot hold it. It turns out that Lao Zhou did it on purpose again.

The third experiment began, "Experiment No. 3" - another piece of blank paper appeared. The students all hoped that it could inherit the unfinished work of the "ancestors". I was so excited that my throat It's almost smoking. As for Lao Zhou, he picked up the cup with determination and filled it up again. "1---2---3..." She quickly turned the cup over. A miracle happened! Half a sheet of snow-white A4 paper actually held up the heavy water. The experiment was a success! Warm applause and long-lasting cheers erupted in the classroom.

Is this cup magical? No, atmospheric pressure plays a vital role. When the cup is turned upside down, because there is no air or atmospheric pressure in the cup, but the outside is full of air, the atmospheric pressure holds the paper firmly. Every scientific experiment contains a wealth of knowledge. I will do more experiments in the future, which will make me more knowledgeable! Paper Can Hold Water Essay Part 7

Today, Teacher Zhou wrote a few words on the blackboard: Paper can hold water!

The students’ faces were full of questions, and I laughed secretly, what’s going on? Even the serious Teacher Zhou makes such an international joke? Ha, there’s a good show to watch!

Teacher Zhou began to do the experiment. She squatted down behind the podium, and curious classmates gathered around to see what was going on. Suddenly, Teacher Zhou stood up abruptly, holding a big red bucket in his hand, and placed it on the table with a thud. Everyone was so frightened that they either threw their things into their schoolbags or ran to the last row to "take refuge." Then Teacher Zhou took out another piece of white paper, folded it and tore it in half, then took out a transparent glass and scooped a glass of water into the bucket, but it was not full. Teacher Zhou pressed half of the paper on the water cup. After counting one - two - three, he immediately turned the water cup over, and the paper jumped into the water with a "pop" and took a bath.

The students laughed: some laughed so much that their stomachs hurt, some laughed so hard that they staggered, and some laughed so much that they shed tears. "Quiet! Quiet, students, the failure just now was because the cup was not filled with water and there was air in it. If it were filled with water, the experiment would be successful! Let's try again!" Teacher Zhou said. The students said in unison: "It's impossible! Hahahaha..." However, a few students were against it and said it could be done! I thought to myself: This play is good!

The second time, Teacher Zhou held the cup in his right hand. This time the water cup was full. He put paper on the cup with his left hand and said one - two - two point one - two point two - Two point three... When Teacher Zhou said two point nine, I thought she was going to turn it upside down. However, the humorous Teacher Zhou said two point nine one, two point ninety two, two point nine three... It made us laugh. The whole class burst into laughter.

At this moment, Teacher Zhou quickly turned the cup upside down, and a miracle happened, the paper held the water! Oh my gosh! A miracle really happened! My eyes instantly opened as big as bells. At this time, Teacher Zhou began to count the time proudly: one, two, three... The students also followed: seven, eight, nine... As they kept counting, some students were so excited that they climbed onto the table, and some rushed to the table. In front of me, I puffed up my cheeks and wanted to blow the paper off, and some students even wanted to reach out and pull the paper off. Fortunately, Teacher Zhou dodged... Anyway, the paper was firmly stuck to it like 502 glue.

At first, the teacher held the cup with his left hand and counted in a jumping manner. But after a while, his left hand stopped working, so he switched to his right hand. Later, his right hand also stopped working, and he continued to hold it like this. Teacher Zhou's tennis elbow was hurting again. When he counted to "one hundred and thirty-three", Teacher Zhou, who was no longer impatient, patted the magical white paper and "let" it jump into the bucket to take a bath. .

A thin piece of paper can actually hold a glass of water. What is the reason for this? The teacher finally told the "truth": It turned out that the first failure was because the water was not full. There was air and atmospheric pressure inside. When it was turned upside down, the air pressure and water washed the paper down, so it could not hold the water. The second success was because the water was full, there was no air in the cup, and the atmospheric pressure outside held the water and paper.

This experiment really opened my eyes and I understood that it is not the magic power of paper, but the atmospheric pressure that is the creator of magic.

Paper Can Hold Water Essay Part 8

"Wow! Wow! That's wonderful!" "Oh my God, that's great!" Eh? What happened in Classroom 8 today? This classroom has always been quiet, but today it is as lively as a concert... Come, let's go and take a look.

During class, Teacher Zhou wrote a row of words on the blackboard and said he was going to do a small experiment. I felt ecstatic, wow! Teacher Zhou, you are so interesting! But as soon as I looked at the blackboard, I almost fainted or something. Can paper hold water? What a big joke! However, I like doing experiments in class, so I’d better wait and see the fun!

Teacher Zhou looked confident and poured water into a delicate cup, but did not fill it up. Then he lightly covered the surface of the cup with half a piece of snow-white A4 paper and filled it with He pressed the paper lightly with his hand. 1! 2! 3! The cup was turned upside down, and with a "crash" sound, the water rushed out, and the white paper rushed into the bucket that Teacher Zhou had prepared. Haha, the first time, it failed.

The failure of the first experiment made Mao Xinze sitting below as anxious as an ant on a hot pot. Teacher Zhou saw his anxious look and asked him to complete the second experiment. Mao Xinze poured water into the cup and filled it, then covered it with paper and wrapped the paper with his hands, hoping that the paper would stick to the mouth of the cup more firmly. Then he poured it down quickly, and with a "swish" sound, the water spilled out mercilessly. There is no doubt that we failed again in the second experiment.

At this time, the classroom immediately exploded. Some students said: "I'll just say this is bragging!" Some said: "Failure is the mother of success, keep trying." Others said: "When will you try this?" Teacher Zhou also looked very anxious. After all, time was limited. If the experiment failed, how could he write the essay?

The third experiment was about to begin. All the students in the class ran up and rushed to help, but the experiment failed unfortunately.

I thought to myself, well, let me just say, this is impossible! At this time, Teacher Zhou said: "Don't be arrogant when you win, and don't be discouraged when you lose. As long as we continue to try, we will definitely succeed!" This sentence encouraged everyone, and we continued to start the fourth experiment. Teacher Zhou was very straightforward this time and poured the cup over at once.

A miracle happened. The paper actually stuck to the cup as if it was glued, and not a drop of water leaked out. This made us so happy, "Great! Awesome!" "How interesting!"... The complaints and anxiety just disappeared.

It turns out that the first failure was because Teacher Zhou did not fill the water with water and there was air in the cup. The second and third times were also because the air escaped from the small gaps in the soaked paper. When it entered the cup, there was no effective pressure difference; but for the fourth time, there was no air in the cup and the paper was not wet. The atmospheric pressure outside the cup firmly held the water in the cup through the paper, so it was successful. A small scientific experiment contains so much knowledge, how interesting it is! Paper Can Hold Water Essay Part 9

"Wow!" "Ah!" "Ah!" screams came from classroom No. 8. What's wrong? What happened? Don't worry, come with me to find out!

"Paper can hold water." As soon as Teacher Zhou wrote these five words on the blackboard, there was a commotion in the classroom. Some students shouted at the top of their lungs: "Impossible! How is this possible?" But some students said firmly: "Yes! I believe Teacher Zhou!" I couldn't help laughing. Water can barely hold up the paper, how can the paper hold up the paper? Live on water. Teacher Zhou still makes such vulgar jokes? Yep, it’s better to fail, keep failing, so we don’t have to write an essay today.

Teacher Zhou looked triumphant and said, "If you don't believe it, just watch!" She was seen firmly holding an empty cup in her left hand and a bottle of water in her right hand, and kept pouring it. Filling the empty cup with water, before it was full, he said: "It's almost done." He took out a piece of white paper, covered it with the cup, pressed the paper gently, and then moved the cup over a large bucket, confidently Said: Look at me! Before he finished speaking, he suddenly turned the cup upside down, and with a burst of water, the paper and water fell into the bucket. The classmates in the front row all became "little refugees", especially the "victim" Shen Fanfei, who was frightened and hurriedly hid aside. Unfortunately, the notebook was already wet. The whole class burst into laughter immediately. I thought: Teacher Zhou, Teacher Zhou, please stop joking. We have already said that this is impossible.

Teacher Zhou stood aside awkwardly. After a while, he calmed down and said, "Failure is the mother of success. The water in the cup was not full just now. There was air in it, and the atmospheric pressure generated would push the water away. Push down. Do it again!” The second experiment begins again!

This time, Teacher Zhou filled the cup with water, and then, "Experiment No. 2" - another piece of white paper appeared, and it was also covered on the cup, waiting to complete itself mission. Teacher Zhou stood up in a serious manner and started counting: 1, 2, 2. 1, 2. 2, 2. 3... She counted until 2. 99, then she carefully turned the cup over. As a result, "Experiment No. 2" was not a "strong man" and failed to hold the water, so the experiment failed again. The reason for the failure this time was that because Teacher Zhou counted for too long, the water soaked the paper and the air got in.

The third experiment began. A classmate was really impatient, so he volunteered to be Teacher Zhou’s little helper. The little helper kept preaching beside him, but to no avail, the experiment failed again!

This is good news. More students rushed forward and enthusiastically gave Teacher Zhou advice, hoping to help Teacher Zhou succeed. Teacher Zhou did a funny Tai Chi move and "rushed" the students to their seats. As for the "Experiment No. 4", it seems to be saying: I'm scared, I don't want to be a "guinea pig". Teacher Zhou ignored it and covered the mouth of the cup with it without hesitation. He turned the cup over very simply, "Wow"! The paper holds the water! The paper finally holds the water! One, two, three...no paper fell for 42 seconds. My eyes widened, it was impossible, right?

Is paper the "Hercules"? No, it’s actually the atmospheric pressure that plays a role. When the cup is filled with water, there is no air. There is air everywhere outside the cup, and the atmospheric pressure generated holds the paper and water firmly!

This experiment has given me a lot of insight, and I want to try it when I get home. Paper Can Hold Water Essay Part 10

I like doing experiments very much. Because the experiment is full of unknowns and very mysterious, and doing experiments can also help me gain a lot of knowledge. Today, in the classroom of Class 3 (8), an eye-opening experiment was performed: the magical atmospheric pressure.

As soon as the class time came, the students were already sitting quietly, staring at the inconspicuous water cups and pieces of paper on the podium. It turns out that Teacher Zhou told us to do experiments before writing this time. We are all so excited!

Teacher Zhou took out a large red bucket from a corner and placed it on the table. Then, he took out a piece of A4 paper and tore it in half. At this time, there was silence in the classroom, and the students were all staring at the big bucket with confusion in their eyes, as if they were thinking: What magic trick is Teacher Zhou going to do? "Today, we are going to do an experiment about the 'magic atmospheric pressure'." Teacher Zhou's voice came from the other end of the podium, "We are going to fill the water cup with water, put the piece of paper on the cup, and then turn it over like this to see if the paper will fall off." As soon as Teacher Zhou finished speaking, The classroom burst into laughter and an uproar. How is this possible? Will the water wash away the paper? None of us were impressed.

Teacher Zhou saw everyone’s disdain and complete disbelief, and said, "Then we will wait and see!"

The experiment began. Teacher Zhou poured some water into the cup, covered it with paper, and shouted: "One, two, three!" As soon as he finished speaking, the teacher turned the cup over. "Coax..." A pot exploded in the classroom. It turned out that the pieces of paper fell and all the water was poured out. I thought to myself: As expected, this experiment must have failed!

When Teacher Zhou saw the students laughing, he said: "There are always failures and successes in experiments. Let's do it again. You must learn to observe carefully."

The second experiment begins. . Teacher Zhou still followed the steps just now, but this time, it seemed that the cup was full of water. Teacher Zhou and his classmates counted down together: "Three, two, one!" The cup turned over.

Wow, a miracle happened. The piece of paper was safe and sound. It didn't fall off and the water didn't leak out. "1, 2,...25, 26, 27..." We counted the time loudly together to see how long this piece of paper could last.

Teacher Zhou was the most excited and said proudly: "Look, this piece of paper seems to be firmly stuck with 502 glue. Do you believe it?" She was even more proud when she saw that it had not fallen off after counting "40" , she made a Tai Chi luck movement with her hands, as if she was trying to transfer some magical power from her body to the white paper, so that it could continue to "fight", but before she could finish the movement, this "lucky person" was in 42 seconds. "Heroic sacrifice", he fell into the bucket with the water with a "swish" sound, startling the unsuspecting teacher Zhou, screaming and raising his feet.

The steps in these two experiments are the same, so why are the endings so different? It turns out that this is the magical atmospheric pressure at work! The first time, the water cup was not filled with water, there was air in the cup, and the cup was turned upside down. With the impact of water from top to bottom, the paper naturally fell down. The second time, the water cup is filled with water. There is no air in the cup, and there is no atmospheric pressure. When the paper is covered and the cup is turned upside down, the outside atmospheric pressure holds the paper and water, and the paper will not fall. It fell.

This experiment was really interesting and I learned a lot. I was eager to get home and try the experiment myself. Paper Can Hold Water Essay 11

Strange, strange, really strange! A thin piece of paper can actually hold a glass of water. Do you think it is strange?

Today’s topic In the composition class, as soon as we saw the teacher bringing a glass and some blank paper, we were all excitedly looking forward to the wonderful experiment. The teacher filled the cup with water and asked Wan Feng, who was experienced in experiments, to perform "The water does not flow when the mouth of the cup is turned down". Wan Mang walked up confidently, calmly covered the mouth of the cup with paper, held it tightly, and quickly turned the cup 180° - turning it upside down. At this time, the air in the classroom seemed to have solidified. The students were all staring at the mouth of the cup tightly, not daring to blink for fear of missing this wonderful scene. I was a little worried that if the paper couldn't hold up, the water would spill out. I saw Wan Neng slowly remove the hand holding the piece of paper - the piece of paper seemed to be possessed and stuck to the mouth of the cup motionless. The water that used to be restless is now docile, like a piece of paper being "sucked" to the mouth of the cup and being firmly locked inside. It’s incredible! Everyone applauded in unison. I was stunned with surprise. Could it be that Wan Meng is the apprentice of magic master Liu Qian? Is there glue on this piece of paper? The teacher saw our puzzled faces and asked Wan Mang to reveal the secret to us: "Around us, there is an invisible and intangible atmospheric pressure. The atmosphere The pressure is greater than the pressure of the water in the cup, so the water will not flow out and the paper will not fall. Just be careful not to let air slip in from the mouth of the cup. "It turns out that this is the case, and I suddenly realized.

What’s even more incredible is yet to come! At this moment, the teacher suddenly had a sudden idea and punched a few small holes in the paper. He smiled mysteriously and asked, “I’ll use this paper with holes to make this again.” Experiment, will the water leak?" Many people said in unison: "It will definitely leak!" The teacher showed a sly smile, and some who were not determined immediately hesitated: "Maybe it won't leak." Some seemed to have figured it out. The teacher understood what he was thinking and said: "It will definitely not leak!" The teacher was ready. Almost all the students in the class stood up, and some even ran to the podium and stared expectantly at the water glass in the teacher's hand. My heart seemed to be hanging. When the teacher turned the cup upside down and the water was still intact, the students cheered. Those students who guessed correctly were dancing with joy, but some students refused to admit defeat, thinking that the holes were poked too small and nothing could be missed by chance. The teacher simply poked a few more larger holes in the paper. It seemed that the teacher was going to take on a more difficult challenge! "Now is the moment to witness the miracle!" When the teacher turned the cup upside down again, the scene in front of me made my mouth open. We were able to swallow a big watermelon - not even a drop of water was lost! But we still felt that the paper would fall off in a few seconds, so we shouted in unison: "One! Two! Three..." and Some shouted like a prank: "Fall! Drop! Drop!" The classroom was really excited. But after we counted to ten, the piece of paper was still firmly attached to the rim of the cup. This is so amazing! Can paper with holes plug the holes on its own? We are all like monks who are two feet long - scratching our heads. Finally, the teacher revealed the answer to the mystery: "The reason water will not leak out from small holes is because water has surface tension, and water forms a thin film on the surface of the holes, preventing water from leaking out. This is like an umbrella made of cloth. Although there are many small holes, it still won’t leak.” The teacher’s words made me enlightened.

This class really benefited me a lot! It turns out that science is all around us if we use our hands and brains.