Some people may ask, if you put an egg in a cup, will it sink or float? Let's do an experiment!
The teacher said that he would do an experiment. First, he took out a transparent glass with half a glass of water, a spoon and a glass of salt. When the teacher took out these things, the students were puzzled. Someone asked, "Do you want to make scrambled eggs?" Someone asked, "Does the teacher want to make poached eggs?" Others asked, "Are you going to make egg soup?"
After everyone asked a series of questions, the teacher said that we should do an interesting experiment to make eggs float on the water. Everyone is curious. I saw the teacher first take out a raw egg and put it in a glass with half a glass of water. However, it sank like a sleeping baby, as if asleep, and the teacher fished it out with a spoon. Then, the teacher put a few spoonfuls of salt into the cup with a spoon and stirred it gently. The originally clear water suddenly became turbid. Slowly, the water became clear again. The teacher gently put the egg in the salt water, thinking that it would float, but it sank like a sleeping baby. There was a burst of laughter in the classroom.
The third time, the teacher took out the egg and added more salt to the cup, and the clear water became more turbid. After a while, the water became clear again. When the teacher put the egg in the salt water, a miracle happened. The egg floated up, as if the baby had woken up and poked its head out of the water, as if observing the outside world.
The teacher said: "this is the principle of floating: if the density of water is less than that of eggs, eggs will sink, while the density of salt water is greater than that of eggs." Because of buoyancy, eggs will float. "
It turns out that there are many mysteries in life waiting for us to explore and discover, so we should be conscientious in life.
Seeing VC tablets today can make iodophor water transparent. I'm curious, so I want to try it myself.
When I got home, I rummaged through the wardrobe and found coke bottles, iodophors and VC tablets. First of all, I pour clean water into an empty coke bottle, which is about 150 ml, but how can I turn clean water into coke? That is to pour 50 ml of iodophor into clear water, so that the original transparent clear water becomes brown "coke". If you look with your eyes, you can definitely tell the truth from the false.
"The next step is to witness the miracle!"
Yes, this sentence is the mantra of magician Liu Qian, and I imitated it and said it to my parents.
I took out 5-6 pieces of VC from the side and threw them into the "Coke" one by one. Slowly, the color of coke faded.
In order to make it transparent faster, I covered it and shook it hard. In less than five seconds, the color of coke changed from dark brown to transparent. Wow, that's amazing!
Mom and dad felt incredible and asked me how it was done. But I don't know the principle, just follow the steps written in the book step by step. In order to know the principle, my parents and I searched online. It turns out that this is because elemental iodine is colored, while iodine ion itself is colorless. VC has a strong reducing performance, which can reduce iodine to iodine ions. So "Coke" will naturally become "Sprite".
Science is really amazing. It comes from nature and serves mankind after being discovered by human beings, so I should observe attentively and learn more knowledge. The little experiment made me fall in love with science.
The day before the holiday, the teacher gave us an assignment, whether the egg is heavy or floating in salt water. On Saturday afternoon, I hurried to do the experiment. Because the results can only be known through experiments.
Mother said, "You need to prepare a cup, a basin of water, a bag of salt and an egg." The experiment began. I took a glass of water first, and then put the eggs in the cup. Strange things have happened. I saw that eggs can float without salt in water. However, the teacher said that only by adding salt to the water can the eggs float. What happened? I asked my mother, and my mother said that this is the egg I bought before, which may be the reason why the egg is not fresh.
So my mother went to the supermarket to buy fresh eggs. My mother said to me, "son, I bought you fresh eggs." Please try again and see if the egg will fall to the bottom. " I can't wait to continue this experiment.
I took a fresh egg and put it in the cup. The egg suddenly sank to the bottom. Oh! Really like the bottom of a small submarine, motionless. I put a spoonful of salt into the cup, and the salt particles sank into the water with small bubbles, and soon the salt dissolved in the water and disappeared. But the egg still didn't move. Then, I added another spoonful of salt. This time, the salt didn't seem to melt as fast as last time, but fell in the cup and on the eggs. In order to make the salt melt faster, I found a chopstick and gently stirred it in the water, and the water flowed in the direction of the chopsticks. After stirring for a while, I stopped, the rotating waterline gradually stopped, and the salt particles disappeared, but the eggs sank to the bottom. I think I haven't added enough salt, so I'll add more salt. Finally, I added two spoonfuls of salt. When the salt was completely dissolved, the egg actually floated completely. I am very happy.
My second buoyancy experiment finally succeeded. I ran to ask my mother out of curiosity. What is the reason? My mother told me that because of adding salt to the water, the buoyancy of the water became greater, and the eggs were lifted out of the water by the buoyancy of the water. Oh, I see.
There are many interesting things in life, which require us to do more work, use more brains and observe more, in order to discover many scientific mysteries and learn a lot of knowledge.
The teacher asked us to do a small experiment. The teacher wrote on the blackboard: dancing scraps of paper. Seeing this topic, we feel that the teacher is whimsical. There are many question marks in students' minds.
When the teacher wrote those words, there was a lot of discussion in the classroom: "What dance does the confetti dance? How can confetti dance? Is confetti useful? Is confetti a mechanical dance? " Anyway, it was written by the teacher. It's possible. The teacher said mysteriously, "Today I will let you meet the dancing scraps of paper."
The teacher has finished, so let's begin to witness the miracle with experiments!
The teacher took out the experimental materials: pen, paper and scissors. First cut the paper with scissors, and "Yi Yi" becomes scraps of paper, then rub your hair with a pen, and finally suck the scraps of paper with a pen. Wow! The scraps of paper are actually absorbed on the pen, but when the pen rubs against the hair, the scalp is worn out. I saw the paper that the teacher sucked up, and it seemed to be dancing. But it's no use rubbing it. As soon as the teacher said that we could rub our heads, the students rushed up.
I rubbed it for three minutes, then gently took off my pen and sucked the paper. Wow! I sucked, and my heart was as sweet as honey. Unsuccessful students are depressed.
When the paper is sucked up, it seems to be enchanted, and some dance on the tip of the pen, which is beautiful; Some people are afraid of heights and jump down in fear; Others stick together in strings, as if playing football.
It turned out that the friction between the pen and the hair produced static electricity, some of which were absorbed by static electricity, and some were not.
It's amazing, science has brought us a lot of fun!
My grandfather is a special chemistry teacher in middle school. The first chemical experiment he asked me to do was the crystallization of alum.
Prepare the experimental supplies first. Experimental supplies include: alcohol lamp, tripod, asbestos net, alum, balance, beaker, medicine spoon, mortar, glass rod, purified water and thermometer. Then I began to do experiments. Meanwhile. I also look forward to the success of the experiment.
Under the guidance of grandpa, I first weighed 25 grams of alum with a balance and poured it into a mortar. I grind alum with a mortar, then divide the alum into two parts, set up a tripod, put an asbestos net on the shelf, put a small beaker on the asbestos net, and pour 100 ml pure water into the beaker. Then put an alcohol lamp under the tripod and light the alcohol lamp.
Next, while the alcohol lamp heats the water, put the alum spoon into the beaker, two spoons at a time. Stir gently with a glass rod every time you put it in, until the alum in the cup melts. Grandpa has been measuring the water temperature with a thermometer to keep it at about 90 degrees Celsius. When all the alum melts in the water, turn off the alcohol lamp. Then, grandpa asked me to take out a piece of alum crystal as big as my little finger belly and gently put it in the alum solution in the beaker as the crystal nucleus.
After the crystal nucleus dissolves a little, it stops dissolving. This phenomenon is called saturation. We sent the beaker out of the window to observe it carefully. An hour later, I saw that the crystal nucleus was covered with small crystals, which looked like sharp needles. The next day, I found that these crystals grew rapidly, and their shapes were very similar to the original crystal nucleus, which was already as big as the whole thumb. If you look at it horizontally, there are some flat triangles on its left, and other places are uneven and easy to break.
The first time I did the experiment, I learned a lot of very important knowledge, such as: knowing the melting point of alum and knowing what the crystal shape of alum is; I also exercised my hands-on ability, which was really rewarding.
Can 6 stitches float on the water? Can the needle "backstroke"?
Today I did an interesting little experiment-the needle floated on the water.
Every household has a needle, but how can it float on the water? I was curious and started the experiment. First, prepare a sewing needle, a big bowl filled with water, an ordinary napkin and a toothpick for my mother.
I spread the napkin flat on the table first, and then put the needle on the napkin; Then, I picked up both ends of the napkin with both hands and gently put it on the water with the paper tape needle. Suddenly, the white napkin became transparent and floated evenly on the water. I couldn't wait to pick up the toothpick and take it out of the bowl. I didn't expect the needle to fall into the bottom of the bowl and the experiment failed. I think it is possible that the paper is not completely saturated.
The second experiment began, and this time I was not as anxious as last time. After the four corners of the napkin sank, I saw that the middle part of the paper was still motionless, and the needle and the paper were still tightly together. So, I picked up the toothpick, gently pressed the napkin into the water, and then gently fished it out of the bowl with the toothpick. I did it very carefully, and I didn't even dare to blink, for fear of touching the needle. When the napkin was completely fished out of the water, I saw the needle floating firmly on the water. I am happy to take a toothpick and say loudly, I succeeded! I made it!
But why can the needle float on the water?
Then I thought of the computer, so I looked it up on the Internet. It turns out that the surface of water has a certain tension, and the surface tension of water supports the needle, so the needle will not sink. I know that needles can float on the water. Seeing the sewing needle floating freely on the water, my heart is really unspeakable.
It turns out that a small sewing needle has such a big mystery. You must do more experiments in the future to enrich your knowledge and bring fun to yourself.
Today, in science class, Miss Huang brought some eggs. The students are confused. Does the teacher want us to bump eggs or eat them? But there are so few eggs that we can't finish them.
When everyone was wondering, Mr. Huang began to say that he mixed raw eggs with cooked eggs when cooking them. Let's distinguish them now. As soon as the students listen, you speak word for word. Some students said, "Shake the egg in your ear. There are raw eggs with sound and cooked eggs without sound. " Some students said, "If you put an egg in water, it will sink into cooked eggs, but it will not sink into raw eggs." Some students said, "Hold the egg in your hand. The heavy ones are cooked eggs, and the light ones are raw eggs. " Some students said even more outrageous: "Don't crack the eggs." Finally, under the guidance of Mr. Huang, we decided to use the most scientific method-turning eggs.
The experiment began. The teacher put two tables together, let the students next to them sit and watch, and let the students behind them stand up and watch. The students stared at it, even if they missed a detail. Always take out the first egg, put the tip down, stand on the table and turn around hard, dancing like an egg-scented ballet dancer. The students shouted, "Cooked! Cooked! " Always take out another egg and flip it in the same way. The egg fell like a drunk. The students said in unison, "It's raw! It's raw! " In this way, the teacher took out one egg after another. Finally, we separated three boiled eggs and four raw eggs.
At this time, a big question mark appeared in my mind: Why can cooked eggs be turned, and why do raw eggs fall off as soon as they are turned? Teacher Huang seemed to see the big question mark on our faces and said humorously, "The yolk and egg white in raw eggs are liquid, and the center is unstable and will not turn, while the center of gravity of cooked eggs is stable and will turn."
This experiment made me understand a truth: science is everywhere, as long as you observe it carefully, you can find it. "
Today, my aunt took me to do an interesting scientific experiment.
First, prepare the materials for the experiment: a glass cup, a bag of salt, a chopstick and a raw egg. I first poured half a glass of water into the glass, then put the raw eggs into the water, and the eggs slowly sank to the bottom in the glass. Then I put five spoonfuls of salt in a row, and the eggs wanted to float a little. Under the guidance of my aunt, I put 3 spoonfuls of salt in a row. Look! The egg gradually moves from the bottom of the cup to the mouth of the cup, and the small area touching the bottom of the cup slowly separates. I'm starting to worry, why not all float!
At some point, I started directly. Let me help you climb out of the bottom of the cup, little egg! I took out my eggs, picked up chopsticks, and stirred the salt water vigorously, just like the Monkey King made a scene in the Dragon Palace with a golden hoop stick and turned the bottom of the cup upside down. The salt at the bottom of the cup finally melted under my beating, and then I put the egg in, and the egg kept floating up and down, and then stood still in the middle of the water; Then add 4 spoonfuls of salt, and the eggs gradually surface, and finally the eggs show their naughty little heads.
I think the photo was taken by my aunt and should be sent to Teacher Zhou to see our experimental results. Aunt communicated with the teacher several times and showed me the teacher's experimental results. Wow! I am surprised! It's two eggs, and two small heads are exposed on the water. I already feel that I am excellent, but I didn't expect the teacher's experiment to be worse! Why do eggs float? I asked my aunt a question. Aunt said: "Teacher Zhou said that when the egg was first put into the water, it would sink to the bottom because its specific gravity was greater than that of water and its buoyancy was less than its own weight." After the salt is released, water dissolves the salt, and the proportion of water increases. When the proportion of salt water and eggs is equal, eggs will float in the middle of water. If you continue to add salt, when the salt water is greater than the proportion of eggs, eggs will float on the salt water.
My aunt told me that all these phenomena are a kind of physical knowledge called "buoyancy law", which I will learn in the future. It doesn't matter if I don't understand now, it's to popularize physics knowledge in advance. I didn't expect so much magical scientific knowledge in a small family experiment, which really surprised me!
I am very grateful to my two family science teachers for their small experiments again and again, which not only enriched my colorful life, but also increased my extracurricular knowledge.
One day I read a passage in a magazine that eggs soaked in vinegar for two or three days will become flexible and have the elasticity of table tennis.
After reading this passage, I feel incredible. "I think it's an armchair strategist. I don't know if it should be done." I told my parents the idea of the experiment.
My parents looked at me with an eager look and agreed.
Everything went well at the beginning of the experiment, but two days later, when I took out my egg to witness the miracle, I found it was broken. Excitement and curiosity turned into depression.
It's a few years in a flash.
Time has tempered me and made me understand that success comes from failure. "How can you see a rainbow without experiencing wind and rain?" I decided to try it again.
Now I am more mature than before, no longer just concerned about the results, but more curious about the process of egg exchange. Since the beginning of the experiment, I have been observing the changes of eggs almost all the time by the cup filled with eggs and white vinegar.
At first, the size of the egg gradually became smaller, and the eggshell was densely and irregularly covered with tiny, transparent bubbles, which were close to a sphere in shape. Some are motionless, as if waiting for something; Others wander around like fish, as if looking for something. I touched the eggshell with my hand, and with a slight stroke, I peeled off a layer of eggshell. It's really "the world is full of wonders"! I was too surprised to blink, for fear that I would miss the most wonderful scene in the blink of an eye.
On the third morning, it has lost its eggshell, and the solidified protein has wonderful colors, white, gray, yellow and orange. White is permeated with gray, gray contains white, yellow is inlaid with orange, and orange sets off yellow.
The phenomenon in the experiment puzzled me. "If you can't learn, ask if you don't understand." I asked Baidu with a question mark in my heart, and the result was this:
The main component of eggshell is calcium carbonate, which reacts with acetic acid contained in white vinegar to produce calcium acetate and carbon dioxide. Those bubbles are carbon dioxide, and the reason for the decrease in volume is the decrease in calcium carbonate content. With the continuous chemical reaction, eggshells will become more and more brittle and eventually disappear.
It is really "paying attention everywhere is learning"!
Small experimental composition 10 On Sunday, the chemistry teacher performed a trick for the children in the same hospital, the content was that clear water turned into "soybean milk" and "soybean milk" turned into clear water. I saw the chemistry teacher holding a colorless and transparent bottle with half a bottle of water in it, and then covered it with a rubber stopper. Then he said to the small audience, "I can turn this bottle of clear water into soybean milk" and then turn soybean milk into clear water. "Say that finish, I saw her gently shake the bottle and say" change ".The clear water in the bottle immediately turned into milky" soybean milk ". The chemistry teacher told her little friend: "Please note that this soybean milk can only be seen, not drunk!" " "Then she called" change "and saw that she shook the bottle a few times. Sure enough, the white" soybean milk "turned into clear water again. The onlookers are puzzled. Please guess, how did the chemistry teacher's tricks change?
Answer:
It turned out that the chemistry teacher put a small amount of alum (chemical name is potassium aluminum sulfate) in the clear water in the bottle in advance. Because alum is soluble in water, the bottle is still colorless and transparent water. When the chemistry teacher called "change" for the first time, because the chemistry teacher gently shook the bottle, a small part of caustic soda (chemically called sodium hydroxide) stuck in the concave part of the rubber stopper was dissolved in clear water. At this time, caustic soda reacts with alum to produce milky precipitated aluminum hydroxide, and clear water becomes milky solution, which looks like soybean milk. The reaction is as follows:
2kal (s04) 2+6nahoh = 3Na2S04+K2S04+2al (OH) 3 (milky white)
When the chemistry teacher asked for a change for the second time, she shook the bottle a few times. At this time, the liquid in the bottle dissolves all the caustic soda tablets in the concave part of the rubber stopper, and the caustic soda and aluminum hydroxide continue to react chemically to generate colorless sodium metaaluminate soluble in water, so that the white "soybean milk" becomes clear again. The reaction is as follows:
Aluminum hydroxide+sodium hydroxide = sodium aluminate +2H2O
The chemistry teacher's trick proved that aluminum has extremely special chemical properties-metallic and nonmetallic.
Small experiment composition 1 1 On the weekend, Teacher Zhao assigned a task to our class to do a small science experiment. I've thought about it for a long time, but I have no clue. Finally, my father suggested doing this little experiment.
First, we prepare the basic materials for the experiment. They are a transparent glass, some tap water and a piece of cardboard.
Dad showed me first. First, fill a transparent glass with water; Then press the cardboard tightly on it; Then quickly turn the cup upside down, which is called lightning hand; Finally, dad pushed the cardboard up. At this time, a miracle happened. The cardboard sticks tightly to the glass, just like glue, and there is not a drop of water in the glass. I saw my father turn the glass in the air several times, but it didn't fall.
Then my father asked me to have a try. I thought: Do you still want to hit me? I did this little experiment for the first time like my father, but the paper card suddenly fell off and the water spilled all over the floor. I worked hard the second time, but the result was the same as the first time. Dad saw it and patiently said to me, don't worry! Take your time! Then he corrected some wrong actions for me. The third time, I learned the lessons from the previous two times, so I got up the courage to do this experiment again. Through my unremitting efforts, I finally succeeded. Dad told me: Because the cup is full of water, there is a vacuum between the cup mouth and the paper, so the external atmospheric pressure can press the paper on the cup mouth, so I also understand that the pressure of the water in the cup is equal to the atmospheric pressure, so the water stays in the cup and will not leak. Give the respondent a gift and a kiss. Words: What a handsome answer! The landlord sent a kiss to express his sincere thanks! I am ecstatic, and this joy is self-evident.
Through this little experiment, I learned a lot, and at the same time, I realized that I had to learn more. Science is around us, and in one experiment after another, as long as we carefully observe and study, we can discover the mystery.
Small experimental composition 12 First of all, we prepared materials: two teacups, a piece of paper, a bottle of baking soda and a bottle of vinegar. Then we began to do the first experiment on the table. The teacher poured half a glass of water into the cup, and then put the paper on it. As soon as the button was pressed, water rushed down at once, wetting our books and clothes. Pupils have written an excellent composition and a small experimental composition. We talked about it one by one. The water has fallen, and our mood is also low. But after listening to Liu Bo's speech, we became quiet: "That's because the water is not full. Be sure to fill it up when you do this experiment. " After he finished, we chatted again. "Can he do it?" Is he bragging? "I don't think he can do it well! "Although I don't believe it, I looked at it hopefully, only to see that the water was full, the paper was covered on the glass, and some people took things far away, afraid of spilling them on things. As expected, the water splashed on a button table, but it stayed on the paper for at least three or four seconds before he barely passed.
Next is the acid-base reaction experiment. I saw the teacher pour vinegar into the second teacup, let the "audience" sitting in front taste it, and then let them tell their feelings. They said it was very sour. The first time the teacher put baking soda in it, they said it was not too sour. The second time I put it in, they said it was tasteless. The other audience present were already dumbfounded. The teacher put baking soda in it for the third time, and the audience tasted it and said that the water was salty.
Finally, the teacher told us a chemical principle: acid and alkali become salt and water together, because salt is heavier than water, so it sinks to the bottom. I think: if I can know a chemical principle every day, I will have no problem in junior high school in the future.
Small experiment composition 13 science experiment is really interesting!
Every morning, my mother drives me to school. When the traffic lights pass by, I always take pains to watch the traffic lights change, and sometimes I will see the traffic police uncle standing next to the control cabinet and manually changing the traffic lights. How I wish I had the opportunity to control the traffic lights by myself!
One day in the summer vacation, I dug out my sister's junior high school physics and science experiment box. I am very excited. Afraid of being scolded by my sister, I closed the door, sat in a chair and devoted myself to the experiment of traffic lights. After a while, several wires were intertwined, but they could not be untied. I am impatient and want to click with scissors. Mom saw me pull some wires and came to help, saying, be careful at the traffic lights. "With the help of my mother, I finally sorted out every wire. I was impatient, so I wound the copper wire around the copper piece at random and made a hasty decision. My mother looked at me angrily and grabbed me without saying a word. One by one, she carefully untied the messy copper wires as thin as hair, twisted them tightly with her fingers, passed through the copper hole, circled it again, then locked it tightly and turned many times. Then pass it to me to check the firmness. I also watched my mother's every move without saying a word. I appreciate it very much. Mom said, "It's not difficult to connect the wires, but not everyone can guarantee that they are all right. Why? " I lowered my head and silently connected the wires in my hand. Every time I see messy copper wire and hair, I will untie it immediately and start over. Finally, after the installation of the signal lamp, it is also clear that we should strive for perfection. At this time, I saw the lampshade leaning to one side, trying to reinstall it, but I had to untie a lot of hard-won wires. My mother came over and said, "What if there are traffic lights on the road at this time?" "Good!" This seems to give me motivation. I untied the wire and reassembled it, and I was very careful at every step. ...
The scientific experiment of this traffic light is not only interesting, but also makes me understand how important "accuracy" is. Everything can't be separated from "accuracy".
I have a potato and a straw. Potatoes are hard and straw is soft.
I tried to crush the potato, so I tried my best, but I still couldn't crush it. I slammed it on the table again and only heard a bang. I picked up the potato and saw that it was only peeled a little. What a stubborn and hard potato! As for the straw, it bends when I break it gently, and it is very soft.
Would you believe me if I said that potatoes can be inserted into straws?
First, I press the potatoes hard with my hands. Remember, I have to hold it down. Then I picked up the straw and held it hard. I held it high and quickly inserted it into the potato. For a moment, I didn't even have time to look at the speed of my hand. The straw has been inserted into the potato. I measured it with a ruler and inserted it about four centimeters. Understand? Even if the straw is soft, as long as it is strong enough and fast enough, hard potatoes can be inserted. If you don't use your strength. Insert slowly. Without speed and strength, it is difficult to insert the straw into the potato.
From this, I thought of my classmates, both excellent and backward, but will those who are backward never learn well? No, as long as he is willing to work hard, insist on making a little progress every day and persevere, he will certainly catch up with or even surpass excellent students. Similarly, if students who study well are complacent, don't take classes seriously and don't study hard, their grades will drop and they will become underachievers.
Hard work and persistence are the magic weapon of learning and the strength and speed of life-saving straw. As long as you set a goal, you will certainly achieve it.
A contest between hard and soft
Small experimental composition 15 There is an interesting experiment in the summer vacation paradise: What happens when you put eggs in water and vinegar respectively? What is the difference? In order to solve this mystery, I will do it.
That day, I began to do experiments. First, I took two transparent cups, one filled with water and the other filled with vinegar. Then I put two eggs in water and vinegar respectively. After about a minute, the egg in the vinegar poked its head out to see how beautiful it was outside, but the egg doll in the water did not move and slept quietly in the water. Just when I was surprised, my father told me that it was because vinegar was more buoyant than water. About five or six minutes later, the egg in the vinegar poked out a small piece, while the egg in the water was still sleeping comfortably. About ten minutes later, bubbles appeared next to the eggs in the vinegar, but the eggs in the water remained motionless. I thought about this question: "Why do eggs in vinegar foam, but those in water don't?" I can only ask my learned father, who said he didn't know, and let me explore for myself. I had to consult my computer master, who gave me the answer quickly. The answer is-the eggshell of an egg reacts with vinegar to produce carbon dioxide, which becomes bubbles and comes out. At this moment, I suddenly realized. I continued to observe carefully. After half a day, I touched the egg in the vinegar with my hand and was surprised to find that the eggshell of the egg became soft and thin. There is still no response in the water. Two or three days later, I looked at the eggs in two cups. There was only a film left in the eggs in the vinegar. Why? I'm confused. Think about it or consult a computer expert again. The answer given by the computer expert is that the eggshell has melted because of the chemical reaction between the main components of eggshell and the main components of vinegar.
Although I don't quite understand the mystery, I think this experiment is very interesting and I have gained a lot of scientific knowledge, so I have to do everything myself, so I will know more knowledge.