Knowledge points of small scientific experiments 1. Interesting scientific experiment
I have an experiment, which is simple and magical.
The experimental materials are as follows:
1. White sugar, 400g.
2. A new brush.
3. Paper cups, two (one for sugar water and one for water).
4. White paper, 2~3 sheets.
5. Lighter.
The experimental steps are as follows:
1. Make a cup of concentrated sugar water, it must be strong, and there is not enough sugar.
Take a piece of white paper and lay it flat on the table. Write or draw on it with a brush dipped in sugar water.
3. When the sugar is dry, bake it with lighter. Newly written words or pictures will appear.
The experiment is finished.
2. Scientific experiments should emphasize principles.
Think about the magical power of chopsticks: insert a chopstick into a cup filled with rice and lift it. Can chopsticks lift rice and cups? Materials: a plastic cup, a rice cup and a bamboo chopstick. Operation: 1. Fill the plastic cup with rice.
2. Press the rice in the cup by hand. 3. Hold the rice with your hands and put chopsticks between your fingers.
4. Gently lift chopsticks with your hands, and the cup and rice are lifted together. Description: Due to the extrusion between rice grains in the cup, the air in the cup is squeezed out, and the pressure outside the cup is greater than the pressure inside the cup, so that chopsticks and rice grains are closely combined, so chopsticks can lift the cup into rice.
Reflections on the bottle race: two bottles of the same weight, sand and water, roll down from a height, who will reach the finish line first? Materials: two bottles of the same size and weight, sand, water, a rectangular board and two thick books. Operation: 1. Make a slope with a rectangular board and two books. 2. Pour water into another bottle and sand into the bottle. 3. Put two bottles on the board and let them roll down at the same starting height. The bottle filled with water reaches the finish line earlier than the bottle filled with sand. Creation: change the substances in the bottle and let them compete! Thoughts on electrified newspapers: without glue, tape and other things, newspapers can stick to the wall and will not fall off.
Do you know why? Material: 1 pencil; 1 newspaper. Step: 1. Spread the newspaper out and lay it flat on the wall.
After a few quick rubs on the newspaper with one side of the pencil, the newspaper will not fall off as if it were stuck on the wall. 3. Lift a corner of the newspaper, and then let go, and the lifted corner will be sucked back by the wall.
Take the newspaper off the wall slowly and pay attention to the static sound. Description: 1. Rubbing a pencil charges the newspaper.
2. The charged newspaper was sucked to the wall. When the indoor air is dry (especially in winter), if you take down the newspaper from the wall, you will hear the crackle of static electricity.
Creation: Please have a try. What else can be stuck to the wall by static electricity without glue? Thoughts on the separation of pepper and salt: I accidentally mixed the kitchen seasoning: pepper and salt. How can I separate them? Ingredients: pepper, salt, plastic spoon, small dish operation: 1 Mix the salt and pepper together. 2. Stir well with chopsticks.
3. Rub the plastic spoon on the clothes and put it on the salt and pepper. 4. Pepper sticks to the spoon first.
5. Move the plastic spoon down slightly. 6. After salt, stick it on the spoon.
Explanation: Pepper is electrostatically adsorbed earlier than salt because its weight is lighter than salt. Creation: Can you separate other mixed raw materials in this way? Reflections on charged balloons: When will two balloons attract each other and when will they repel each other? Material: 2 inflatable balloons, 1 string, 1 cardboard. Operation: 1 Inflate two balloons separately and tie a knot in your mouth.
Connect two balloons with a thread. Rub the balloon on your hair (or sweater).
Lift the middle part of the rope and the two balloons will separate immediately. Put the cardboard between two balloons, and the electricity on the balloons makes them attracted to the cardboard.
Description: 1 The electricity on one balloon repels the electricity on the other balloon. The electricity on the two balloons attracts them to the cardboard.
Creation: Can other small experiments be used to illustrate that balloons are charged? Lovely watermark thinking: the beautiful patterns on rice paper are not drawn, but how are they made? Material: 1 washbasin, 1-2 rice paper, 1 chopsticks, 1 cotton swab, 1 bottle of ink and water (about half a basin) Operation: 1. Pour half a basin of water into the washbasin and gently touch it with chopsticks dipped in ink. 2. Wipe the scalp with a cotton swab for two or three times.
3. Then touch the center of the ink circle and see what happens. 4. Gently cover the calligraphy paper on the water, and then pick it up slowly. What patterns are printed on the paper? Explanation: 1 When the cotton swab touches, the ink will expand into an irregular circular pattern.
2. A small amount of oil on the scalp rubbed by cotton swabs will affect the mutual pulling force of water molecules. 3. The watermark will present irregular concentric circles.
Creation: Try other methods to change the ink pattern on the water surface. Intermittent thinking about water flow: why do many streams become a stream when you touch them with your hand? Material: a tin box, awl, water operation: 1. Drill five small holes in the bottom of the empty tin can box with nails (the hole spacing is only about 5 mm).
2. Fill the water tank with water, and five streams of water flow out from five small holes. Twist these streams together with your thumb and forefinger.
When the hand is removed, the five streams of water will merge into one. If you wipe the small hole in the jar with your hand again, the water will become five strands again.
Description: The surface tension of water separates and closes the water flow. Reflections on floating needles: Why do needles float on the water? Material: a bowl of water, needle, fork and liquid cleaner. Operation: 1. Pour a glass of water into the cup. Carefully put a needle on the water with a fork. Move the fork slowly, and the needle will float on the water. Drop a drop of detergent into the water and the needle will sink. Explanation: 1 It is supported by the surface tension of water.
Surface tension is the cohesive connection formed by water molecules. This cohesive connection is due to the fact that some molecules are attracted together and the molecules squeeze each other to form films.
This kind of film is called surface tension, which can hold the object that should sink. 2, detergent reduces the surface tension, the needle will not float.
Attention: The needle is dangerous, please ask parents to help you operate it. Magical toothpick thinking: Will toothpicks in water swim with sugar cubes in water or with soap in water? Materials: toothpick, a basin of water, soap, sugar cube operation: 1. Carefully put the toothpick on the water.
2. Put the sugar cubes in the basin, away from the toothpicks. The toothpick will move towards the sugar cube.
3. change it.
3. A simple scientific experiment
Original publisher: Yong Er 960.
55 scientific experiments easy to learn part 1 55 scientific experiments easy to learn 55 scientific experiments easy to learn < <; 55 easy-to-learn scientific experiments are at the top of the hidden form and at the bottom of the form part 1 Think about the magical power of chopsticks: insert a chopstick into a cup filled with rice and lift it up. Can chopsticks lift rice and cups? Materials: a plastic cup, a rice cup and a bamboo chopstick. Operation: 1. Fill the plastic cup with rice. 2. Press the rice in the cup by hand. 3. Hold the rice with your hands and put chopsticks between your fingers. 4. Gently lift chopsticks with your hands, and the cup and rice are lifted together. Description: Due to the extrusion between rice grains in the cup, the air in the cup is squeezed out, and the pressure outside the cup is greater than the pressure inside the cup, so that chopsticks and rice grains are closely combined, so chopsticks can lift the cup into rice. Reflections on the bottle race: two bottles of the same weight, sand and water, roll down from a height, who will reach the finish line first? Materials: two bottles of the same size and weight, sand, water, a rectangular board and two thick books. Operation: 1. Make a slope with a rectangular board and two books. 2. Pour water into another bottle and sand into the bottle. 3. Put two bottles on the board and let them roll down at the same starting height. The bottle filled with water reaches the finish line earlier than the bottle filled with sand. Creation: change the substances in the bottle and let them compete! Thoughts on electrified newspapers: without glue, tape and other things, newspapers can stick to the wall and will not fall off. Do you know why? Material: 1 pencil; 1 newspaper. Step: 1. Open the newspaper and put it
4. Small scientific knowledge should be concise, reasonable and novel.
The scientific knowledge of primary school students is 1. Rabbits beat the ground with their legs to transmit information, mostly with their hind legs, which is a way for them to express their feelings to female rabbits. 2. The biggest monkey in the world is a baboon and the smallest monkey is a bonobo. 3. The real name of "Four Elephants" is Elk, which is a rare animal in China. 4. Why should sorbet take risks? The reason why sorbet bubbles is that there is a lot of invisible water vapor in the outside air. When it meets a very cold sorbet, it will liquefy into droplets and surround it when it is cold. The sorbet seems to be bubbling. 5. Why do sunflowers always face the sun? Sunflower stems contain a wonderful auxin. This auxin is very afraid of light. When it is irradiated by light, it will go to the backlight side, and the cells on the backlight side will multiply rapidly. Therefore, the backlit side will grow faster than the bright side, which will bend the sunflower to light. 6. Why do cicadas shed their skin? Cicada's shell (exoskeleton) is hard and can't expand with the growth of cicada. When the cicada grows to a certain stage, the cicada's exoskeleton restricts its growth, and the cicada loses its original exoskeleton, which is cicada slough. 7. How do bees make honey? Bees spit the sweet juice of flowers into an empty beehive. At night, they suck the sweet juice into their honey stomachs to make it, and then spit it out and swallow it. It takes 100~240 times before it becomes sweet. 8. Why do the stars twinkle? We see the stars shining, not because the luminosity of the stars has changed, but because of the occlusion of the atmosphere. The atmosphere separates us from the stars. When the stars pass through the atmosphere, they will be affected by the density and thickness of the atmosphere. The atmosphere is not absolutely transparent, and its transparency will change according to its density. So when we look at the stars through it on the ground, we will see that the stars seem to be flashing. 9. Why do people yawn? When we feel tired, our bodies have produced a lot of carbon dioxide. When there is too much carbon dioxide, we must supplement oxygen to balance our needs. Because these residual carbon dioxide will affect the functional activities of our body, our body will send out a protective reaction at this time, so we yawn. Yawning is a deep breathing action, which will make us breathe in more oxygen and expel more carbon dioxide than usual, and also achieve the effect of eliminating fatigue 10.00000000 1003 The snake has many scales, which is the outermost armor. Scales are not only used to protect their bodies, but also can be their "feet". When a snake crawls forward, its body will be S-shaped. Every scale except the S-shape will be tilted upward to help the snake grasp the uneven road when it moves forward. These scales cooperate with the muscles of snakes and can push their bodies to crawl forward, so snakes can walk without feet! 1 1. Why does hair turn white when people get old? There is a substance called melanin in our hair. The more melanin, the darker the hair will be. Without melanin, hair will turn yellow or white. When human beings reach old age, various functions of the body will gradually decline, and the formation of pigments will be less and less, so the hair will gradually turn white! 12. Why do fireflies glow? Fireflies emit light because there is a luminous body at the end of their abdomen, which is filled with a lot of phosphorus-containing luminescent substances and luminescent enzymes, so that fireflies can emit flashing light. Fireflies shine not only for lighting, but also for courtship, vigilance and trapping. This is also a communication tool for them. Different kinds of fireflies have different luminous modes, luminous frequencies and colors, so that they can convey different information. When you are hungry, you will make a purring sound. This is because the food you have eaten before has almost been digested. Although the stomach is empty, the gastric juice in the stomach will continue to secrete. At this time, the contraction of the stomach will gradually expand, and the liquid and gas inside will stir up and make a purring sound. Don't be embarrassed by the growling of your stomach next time! Because this is a normal physiological action. 14. Why can't ostriches fly? A giant ostrich, but they can't fly into the sky! This is not because their wings are useless, but because their feathers are too soft and their wings are too small to fly at all. In addition, the ostrich's muscles are underdeveloped and its sternum is flat, which is not conducive to flying. Ostrich has lived in Africa for a long time, and in order to adapt to the environment, its body has gradually evolved into what it is now. Why can't the food in cans go bad easily? Lunch meat, black beans and ketchup beans are all delicious canned food. They can be kept for a long time and are not easy to go bad. Because the can is sealed, bacteria can't get in. When people make canned food, the air inside is pumped out and then sealed. Without air, even if the food inside is stained with a little bacteria, they can't survive or reproduce! 16. Why does the baby cry all the time when it is born? Babies cry when they are born, not because they are unhappy, but because they are taking the first breath of air! When babies leave their mother's body and are born, the first breath of air will rush to their throats, violently impact the vocal cords, make them vibrate, and then make a sound similar to crying. 17. Why does the lizard keep bouncing when its tail is broken? In order to protect themselves, many lizards also protect their eyes and ears; On the other hand, when some lizards are attacked, their tails will be broken due to the severe contraction of their muscles. Some nerves in the broken tail are still alive and will keep bouncing, thus distracting the enemy and running away. Don't think that their lives will end like this. In fact, it only takes a few months, and their tails will grow back and continue to live. 5438+08, why is the squirrel's tail so big? Don't look at the relaxed mouse tail! The squirrel's tail played a great role when it jumped on the tree. It can keep balance when the squirrel jumps to the tree to avoid falling and being injured. In addition, this big tail can play a protective role in winter, tightly surrounding the squirrel's body, which is convenient and practical. Why can't a human thumb have one or three knots? The average person has five fingers, each with a different length. However, has anyone noticed that besides the thumb, other fingers are also there.
5. Learn more science 200 points.
Why does scientific sorbet get angry? The reason why sorbet bubbles is because there is a lot of invisible water vapor in the outside air. When it comes to cold sorbet, it will liquefy into droplets when it is cold. It seems that the sorbet is bubbling.
Why do sunflowers always face the sun? Sunflower stems contain a wonderful auxin. This auxin is very afraid of light.
When it is illuminated, it will go to the backlight side, and the cells on the backlight side will multiply rapidly. Therefore, the backlit side will grow faster than the bright side, which will bend the sunflower to light. Why does cicada shed its skin? Cicada's shell (exoskeleton) is hard and can't expand with the growth of cicada. When the cicada grows to a certain stage, the cicada's exoskeleton restricts its growth, and the cicada loses its original exoskeleton, which is cicada slough.
How do bees make honey? First, the bees spit the sweet juice of the flowers they picked into an empty hive. At night, they suck sweet juice into their honey stomachs to make it, and then spit it out and swallow it. It takes 100~240 times to make sweet honey. How do birds sleep? During the day, birds shuttle in the branches, chirp and fly freely under the blue sky. At night, they should rest, sleep and recover their strength like us, but the sleeping posture is different! Beautiful mallard ducks and swans hunt and play in the water during the day, but they can't rest when they leave their favorite water at night.
They bend their beautiful long necks, bury their heads in their wings, and then let themselves float on the water, dreaming a beautiful dream, drifting with the tide, very leisurely. Long-legged birds such as cranes, storks and herons always sleep independently on one foot, and when they are tired, they change their other feet, which is a model of combining work and rest.
Partridges like to form a big circle in groups when resting, and then their heads are outward and their tails are inward. In this way, no matter which direction the enemy attacks, they can find and escape in time.
Birds with sweet voices, such as blackbirds and larks, usually bend their legs when sleeping, and their claws bend to firmly grasp the branches without worrying about falling from the trees. And the owl, a "night-shift" raptor, you can always see it standing on a dense branch with one eye open during the day, actually sleeping.
Isn't the owl's sleeping position very different? Is to always monitor the surrounding environment and guard against enemy attacks! = = = = = = = = = = = = = = = = = = Will the fish drown? Fish has gills and can breathe in the water, while fish has swim bladder and can float freely in the water. However, some people say that fish living in water will also drown. Is it true?/You don't say. It sounds ridiculous, but it's true.
The swim bladder is the "lifebuoy" for fish swimming, and it can adjust the specific gravity of fish by inflating and deflating. In this way, when swimming, the fish can maintain a stable state and not sink or float in the water with minimal muscle activity.
However, when the fish sinks to a certain depth (that is, the "critical depth"), the huge external pressure will make the volume of the swim bladder irreparable. At this point, its buoyancy is less than its own gravity, so it will involuntarily sink to the bottom of the water, can not float up again, and will eventually drown because it can not breathe.
Although fish can still float upward by swinging their fins and tails, it won't help if they sink too deep. On the other hand, fish living in the deep sea can live freely in the deep water because their bones can bear great pressure.
If we quickly let the fish living in the deep sea reach the "critical depth", it will continue to "swell" until it comes to the surface because the pressure inside its body cannot be balanced with the smaller pressure outside. Sometimes, it even spits out its internal organs and "explodes" to die.
= = = = = = = = = = = = = = = = = = Greedy children become stupid. Gluttony will reduce the blood flow to the brain. If you eat too much at a time, or eat all the time, you will mobilize a lot of blood in the human body, including blood in the brain, to the gastrointestinal tract. Adequate blood supply is the premise of development, and if it is often in ischemic state, its development will inevitably be affected.
Gluttony will lead to overeating in the "obese brain", especially if you eat too much nutritious food, the calories you consume will greatly exceed the calories you consume, and the heat energy will be converted into fat and accumulated in the body. If there is too much fat in brain tissue, it will cause "brain obesity".
Studies have confirmed that human intelligence is related to the number of wrinkles in the sulcus gyrus of the brain. The more obvious the sulcus gyrus, the more wrinkles, and the higher the intelligence level. The obese brain makes the sulcus close, wrinkles disappear, the cerebral cortex is smooth, the neural network is poorly developed, and the intelligence level will be reduced.
Overeating can inhibit the physiological function of the intelligent area of the brain. The way of human brain activity is that excitation and inhibition induce each other, that is, when some parts of the brain are excited, some areas of its adjacent parts are in a state of inhibition. The stronger the excitement, the deeper the inhibition on the surrounding parts, and vice versa. Therefore, if the autonomic nerve center responsible for gastrointestinal digestion is excited for a long time because of overeating, it will inevitably lead to the suppression of adjacent brain intelligent areas such as language, thinking, memory and imagination.
If these areas are often suppressed, their intelligence will get worse and worse. Overeating can damage the brain because of constipation. Snacks for children are mostly high-nutrient fine foods, which are easy to constipation.
When constipation occurs, the metabolites accumulate in the digestive tract for a long time, and after the action of intestinal bacteria, a large number of harmful substances are produced, which are easily absorbed by the intestine and enter the blood circulation, causing chronic poisoning of brain nerve cells and affecting the normal development of the brain. Overeating can also promote premature aging of the brain. In a study, scientists found that a substance that can promote premature aging of the brain-fibroblast growth factor, will increase tens of thousands of times after meals because of overeating. This is a substance that can promote arteriosclerosis, so overeating will cause premature aging of the brain in the long run.
Simple and easy-to-learn scientific knowledge The mystery of automatic rotation: Why do cartons filled with water rotate? Materials: empty milk cartons, nails, 60 cm long rope, sink, water operation: 1. Punch five holes in the empty milk box with nails. 2. One hole is in the middle of the top of the carton, and the other four holes are in the lower left corner of the four sides of the carton. 3. Tie a rope about 60 cm long on the top hole. 4. Put the paper box on the plate.
6. Steps and conclusions of the scientific experiment in the fifth grade of primary school
This manual was compiled by Chen of Dayang Road School in Liandu, and nearly 40 experiments were arranged. Each experiment is described from eight aspects: experiment name, subject and page number, experiment purpose, experiment equipment, experiment steps, experiment record sheet, phenomenon and conclusion, and remarks.
Unit 1 ups and downs experiment name: observing the ups and downs of objects and page number: "Is an object sinking or floating in water?" Second experimental purpose: 1. Ask the students to guess according to their existing life experience and show their initial concept of judging the ups and downs. 2, observe the ups and downs of different objects, and compared with the forecast, found the problem.
3. Initiate thinking, and initially discuss what factors will affect the ups and downs of objects. Experimental equipment: small stones, foam blocks, paper clips, candles, empty bottles with lids, apples, erasers and sinks. Experimental steps: 1. Predict the ups and downs of seven objects in the water and explain the reasons.
2. Put seven kinds of objects into the water in turn, and observe and record. 3. Compare the experimental results with the prediction, and discuss the factors that affect the fluctuation.
Experimental record sheet: small stone, foam block, paper clip, candle, empty bottle with cover, apple rubber, my prediction of experimental results, phenomena and conclusions: sinking objects include small stone, paper clip and rubber, while floating objects include foam block, candle, empty bottle with cover and apple. The ups and downs of different objects in water are different.
Remarks: 1. It is tedious to record the reasons for the prediction. Students are advised to communicate orally. 2. Put the object in the middle, and then observe the ups and downs of the object, observe the ups and downs of the object.
Experimental Name: Observing the ups and downs of objects of the same material in water Theme and Page Number: Is the object sinking or floating in water? Face 3-4 Experimental purpose: 1. Knowing that an object made of the same material changes its weight and volume, the ups and downs will not change. 2. Learn to study ups and downs by dividing overlapping objects.
Experimental equipment: rubber, apple, paper clip, small piece, knife, adhesive tape, sink Experimental steps: 1. Put the rubber and apple into the water and observe the ups and downs. 2. According to the requirements of 1/2, 1/4, 1/8 and smaller, cut the rubber and apple into smaller pieces, predict the ups and downs, and explain the reasons.
3. Put the paper clips and small pieces of wood into the water and observe the ups and downs. 4. String several paper clips together and stick two small pieces of wood together to predict the ups and downs and explain the reasons.
5. Observe the records and discuss the experimental findings. Experimental record sheet: my prediction of the smaller glue of full glue 1/2 glue 1/4 glue 1/8 glue.
7. Find a simple scientific experiment
The magic toothpick In science class today, the science teacher brought a big basin of water, and then he held a toothpick in his hand, saying that he was a magician and could move the toothpick at will. With that, he threw the toothpick in his hand into the basin of water. I didn't expect toothpicks to really move around under the "manipulation" of science teachers. After returning home, I also learned "magic" from my science teacher.
I poured a basin of water first, then took out a toothpick and soap, turned out the sugar cubes and began to "change" into "magic". I carefully put the toothpick in the water and threw the soap next to the toothpick. A miracle happened! I saw the toothpick slowly leave the soap and swim farther and farther until it touched the edge of the basin. Wow! Amazing, I fished out the soap again and threw a big piece into the water. Toothpick seems to be playing acrobatics again. After turning around, it floated to the cube, slowly approaching the cube and floating above it. Ha ha! I am really amazing. I succeeded in my first experiment, but why do toothpicks stay away from soap and close to sugar cubes? So I looked it up online, oh! It turns out that when I put the sugar cube into water, it will absorb some water, so there will be a small water flow in the direction of the sugar cube, and the toothpick will move with the water flow.
But when I put the soap in the basin, the surface tension of the water in the basin is strong, and I will pull out the toothpick. Suddenly, another question sprouted in my mind. What happens to toothpicks if you put sugar cubes and soap in the basin at the same time? I started the experiment again. I put sugar cubes and soap together in water, and then put toothpicks in it. Suddenly, the toothpick spun quickly, turning round and round. Finally, the sugar cubes melted first, and the toothpick ran to the edge of the basin.
This experiment is really interesting, not only gaining knowledge, but also getting happiness from it! I wrote this myself. I took it to the competition last year. I hope it can be adopted. There is absolutely no plagiarism, but it is too popular. Agree with 2| Comment Report | 20 12-3-22 17:05 Enthusiastic netizen "Ding Lingling". As soon as the bell rang, the teacher came into the classroom with a big smile.
"Students, have you brought all the eggshells?" "I brought it!" We answered with one voice. "But what can eggshells do?" "Be a tumbler?" We whispered to each other.
"Today, we are going to do a small experiment with these two and a half eggshells. Before you do it, please guess, I use this pencil to stab the eggshell vertically, and see which half of the eggshell breaks first? " "The next mouth is broken first!" Most boys pointed to half a shell and said.
"Mouth up first!" My deskmate said flatly. Many girls are sitting and hesitating.
"That's great! Let's do it and see whose answer is correct. " The teacher turned to a classmate for help. He put his mouth against the teacher's hand and pointed a pencil at the eggshell. As soon as his hand was released, the pencil fell on the eggshell, which was not broken.
The second time I dropped the pencil, but it fell into the teacher's hand, and then fell to the ground. pencil lead broke it. The teacher took out another pencil, this time she made it herself. The pencil was dropped only twice, and the eggshell with the bottle mouth up was broken.
Then, the teacher picked up the pencil and poked the eggshell with his mouth down. "Once, twice, three times ..." We counted them together, but this half eggshell looks like wearing armor, and it won't break after being stabbed for more than a dozen times.
"Yes! I guessed right! " The deskmate danced with joy. "good! Next, I will let the students do it themselves to see if this is an accidental phenomenon. "
"Yes, don't be too proud!" We don't believe it. After doing this little experiment ourselves, we finally understand that the same two and a half eggshells are tied vertically with a pencil, because the downward eggshell is concentrated, so it is easier to be tied; However, the eggshell with its mouth facing down is scattered and not easy to be punctured.
No wonder all the workers and uncles in our school construction site are wearing face-down safety helmets. It turned out to be the same thing! Small experiments contain great truth. This course is really interesting! An interesting experiment. From grade one to grade four, science has always been my favorite subject. I have done countless experiments in science class, but among these countless experiments, the only thing I remember vividly is the coin experiment I did not long ago.
In science class that afternoon, the teacher announced to us: "Today, I will do a very interesting experiment with you!" " ""yes! "As soon as the voice fell, the students cheered." Is it an experiment of throwing coins into the water? "A classmate is a prophet.
"That's right! Who has a coin around you? " "I! Me! I have! " The students are scrambling to hand in the coins. The experiment began, and the teacher threw coins into a full cup. I crowded in front, my eyes wide open, staring at the cup tightly, for fear of missing any tiny link.
"One, two, three ..." Coins "jumped" into the glass one by one, and the water surface was rising. The teacher suddenly stopped and asked, "Students, guess what will happen next?" "The water will overflow!" The students said in unison.
"Wrong! We continue to look down! " "Who has a coin?" The teacher "ferreted out" six coins from his classmates and carefully put them into the water one by one. After the last coin plopped into the water, it turned 360 degrees in the water like a trained diver before falling into the bottom of the cup. At this point, the students were surprised to find that the water surface actually exceeded the cup mouth, and it was half a centimeter! The students immediately surrounded the teacher and asked why, but the teacher bought a pass and asked us, "What do you think?" We're all monks-we're all at sea.
After repeated inquiries from the students, the teacher finally opened his mouth and said mysteriously, "This is the tension of the water surface. It is this invisible force that supports the water surface beyond the mouth of the cup without overflowing. " I see! We finally understood the truth.
This experiment taught us that we should not draw arbitrary conclusions about anything, but be brave in exploration and practice in order to solve the mystery. There are many secrets in nature, and I believe we can solve many mysteries as long as we keep exploring.
An interesting experiment "Volcanic eruption", you must have seen it on TV, but have you seen it with your own eyes?