I found a place to sit down. Looking around in the seat, we found that our experimental materials are: salt, ice, iron cups filled with 1|3 water, and semi-dry and non-wet towels.
After a short class, we started the experiment:
1. Let's measure the water in the cup by temperature first.
Put the ice cubes in the cup and see how much the temperature of the water has dropped.
Put five spoonfuls of salt in the water and measure the temperature again.
4. Add ice cubes, add two spoonfuls of salt and mix well. During the measurement, it was found that the temperature plummeted, and soon, the temperature dropped below zero.
We'll talk about it later. After class, we picked up the cup, only to find that the towel was firmly stuck to the towel and had to peel it off.
This is really a special science class!
2. Science is like an ocean ten thousand times larger than the universe. We are like some fish. Although we swim freely today, there will be no oxygen in the water tomorrow, so we have to change places and the ocean will be polluted by us. At this time, we will look for another ocean.
This is the new science we are looking for. Only by constantly updating can we have a better life. In 2 1 century, science will become human life.
If you don't know science, you can't survive in this society. If you have a seed of science and cultivate it carefully, it will take root, sprout and bear countless fruits over time ... The Nobel Prize in Science is an award that inspires people to love science and create our better life with science.
466 scientists from more than 20 countries won the Nobel Prize. When they walk to the podium of the Nobel Prize, they represent that they have great wealth created by science. Therefore, we should study science, love science and show science.
But how can we do it? Scientists tell us that curiosity is one of the most important aspects of human nature and the main driving force for exploring scientific mysteries; The best way to satisfy this strong desire is to have the courage to ask why, to try and innovate, to overthrow the previous words and conclusions, and finally to get your own results. For example, Galileo, Copernicus and others bravely pointed out the wrong arguments of their predecessors regardless of pressure and opposition from all sides.
Through personal practice and experiments, I proved that my point of view was correct and gained my own success. I heard that there are three senior one students in a middle school, and they are also very curious.
They are full of curiosity about the national musical instrument CuO. After analyzing the characteristics of this instrument, they decided to make a musical instrument similar to "Wrong". They go to pick up or buy a lot of straws every day. They study carefully, take advantage of countless breaks and experience countless failures.
As the saying goes, "failure is the mother of success" is not wrong at all. They finally succeeded. 65,438+0,000 straws are inserted together to form a huge straw instrument, which sounds as beautiful and euphemistic as its sound, even better than the sound of "Fu". Although they are not great scientists, it is not easy for them to think of such things and overcome many difficulties to do them.
In fact, the innate conditions of Nobel Prize winners are not as good as ours. Why can't we do what they can? Young friends, seize our precious youth! Use your head and do it! Science is like an ocean ten thousand times bigger than the universe. We are like some fish. Although we swim freely today, there will be no oxygen in the water tomorrow, so we have to change places. This ocean will be polluted by us. At this time, we will look for another ocean. This is the new science we are looking for. Only by constantly updating can we have a better life.
The power of science is infinite, and it will bring you unexpected wealth. Therefore, we should love science, but if we don't dig the mystery of science and practice it, we will never get the happiness of science.
Some people only know one thing and don't know another. How can they succeed if they only understand the surface and don't explore deeply? How far is the Nobel Prize in Science from us? Needless to say, as long as you sow the seeds of science from an early age and study hard, it will be around us.
3. The third grade science diary of primary school students is only 100 words, which urgently needs the test results on July 4th. Today, the final exam results were issued, and I was very nervous and scared, because if I didn't do well in the exam, I would be scolded by my parents! The test paper was issued, and both English and math were good, but I got 89.5 points in Chinese. Fortunately, I am excellent, so my mother won't scold me! Alas, my Chinese grades are so poor this time! I like to help my teacher on the 7th and 5th. I'm going to clean this afternoon. I'm listening to the school radio. Guo Qingwen asked me to help Miss Lin. Besides me, there are three students.
Come to the office, make arrangements when you arrive, and then do something else. Mr. Lin was very happy after we finished. He gave each of us a notebook and invited us to eat ice cream.
Teacher Wen said that she would come to help her tomorrow afternoon. We are all very happy! I like helping teachers on July 6th. This afternoon, all of us came to help again. The teacher asked me to arrange the quality manuals of the whole class according to the student number, and then let us put some awards on the ribbons and flowers. We went to the broadcast room again and cut out some teachers' comments and posted them in the manual.
Seeing that we were tired, the teacher invited us to eat watermelon. Finally, Mr. Lin, let's move the box to the "accounting room" and come home soon! Composition books are in my home, and most of them are composition books, because I like to treat them as documents. Of course, I have seen most of them! I like reading fictional articles because they are interesting.
I don't like reading a landscape article because it is complicated and meaningless. The content in the composition book is really rich! July 12, sweeping (drying) clothes. Today my mother asked me to (sweep) clothes. I don't want to? Finally I reluctantly agreed! Come to the washing machine on the balcony, there are so many clothes in it! I picked up clothes and a hanger, put the clothes neatly in the hanger, and then swept (dried) the clothes on the sweeping (drying) rod with a fork.
According to this method, I quickly swept (dried) all the clothes. Although it is tiring work, I like to sweep (dry) clothes when I see them neatly! It's really fun to go shopping tonight. Tonight, I go shopping with my mother. (Not far away) The street is crowded with people, many people, and even many people pass by! My mother picked out clothes at a stall, looked around again and whispered to me, "Someone tried to rob my wallet just now!" " "I'm scared, grab my mom's bag and be careful! Mother bought a big bag of jelly in Li Ka-shing and a bag of pomegranate outside.
We came to the door of Huiwanjia, found an "ice porridge" shop and asked for a bowl of "ice porridge" here. My mother said to buy a flashlight and let me wait for her when I eat here. I only ate a little ice water, and my mother came out. We went home happily! Buffet Today, Dad's friend invited us to a buffet (the friend's house also went). I listened, don't mention how happy I am! Came to a village called Baxi 0? What happened? ————‖‖‖‖‖‖‖? Especially one? Yu Yu? "Yi yi suck? ⒑?? [6] Why not fade out? Has the sedan chair returned to Xia Meng? Where's the cloud? Later, I also took a glass of fresh milk and five pitaya! After a while, we all went home happily! My wish I have many wishes, but I don't know if they will come true! I really want to have a TV set, because my mother won't show me TV! I really want to get a hundred points, because I haven't tried this kind of happiness yet! I really want to grow up quickly, because my mother won't let me do some things! On July 24th (1), my brother will be hospitalized for more than a week. This afternoon, because my brother is ill, I will be hospitalized for more than a week. My mother asked me to stay with my cousin, but I refused, so I had to stay at home by myself. Mom gave me two yuan to buy bread! So, mom, dad and brother left! July 24th (2) Lonely After they left, I was very unhappy. What should I do at night? I'm scared! I thought, 5: 45, it's almost 6: 00 (there is a good program at 6: 00)! I called my mother and said I wanted to watch TV. My father promised to go home and turn on the TV for me! After waiting for a long time, dad hasn't come back yet, and the program is about to start! I cried! After a long time, the program is over! In the evening, I finished my dinner, washed the dishes and sat down! On July 24 (3), the miracle suddenly opened the door. When I opened the door, it was Mom and Dad and my brother! But why did you come back? It turned out that because there was no bed, my mother was blown down by the wire frame. Fortunately, the man lost 500 yuan! They are happy to come back, but they will leave again tomorrow afternoon! On August 3rd (4th), I was no longer lonely because I didn't dare to sleep alone at night, so my father went home to sleep with me! & lt3> Then grandma came! Then, the feeling of loneliness disappeared! Typhoon on August 3, it rained heavily today. Grandma said a typhoon was coming. Then she helped me add clothes! I turned on the TV and saw the "blue" signal, so I asked my grandmother what was going on. My grandmother said it meant typhoon! I didn't expect this signal in every weather! My Dream Last night, I had a strange dream, and it was very long! I dreamed that my family lived in a big apartment, and I didn't even know where the exit was because I was unfamiliar with it. Later, I asked my neighbors to find an exit! I visited another big shopping mall, which has 600 floors! The mall is too big, and I'm lost again. What should I do? There is a delivery elder sister in front. I know, she took me to the exit! I finally went home, and my dream was over! On August 5, when my brother's eyes were ready to sleep at noon today, I heard him crying. My mother said, "You obviously asked for it. Your eyes are like this. Why are you rubbing ... "I listened and ran to my mother's bed to see, ah, my brother's eyelids are upside down! It's red. It's scary! I was scared and ran back to my room! So protect your eyes in the future! Don't rub your eyes with dirty hands! Happy Day Today, I did some homework, and my mother made me watch TV for half an hour.
I took a nap and my mother played computer games for me. I continued studying for a while, and my mother promised to watch TV for me at 7: 30.
Although today is boring, it is not.
4. The first science article around the composition of the third grade of primary school.
The science around you
Why does milk have a layer of skin after heating?
The skin floating on the surface of milk is solidified, protein. Milk contains the place where cattle grow and develop.
There are essential nutrients, and protein is one of the most important nutrients.
Once heated, protein will solidify. Boiled eggs will solidify because they are inside.
Protein is solidified. Protein in milk will also be solidified by heating.
Protein, especially protein of milk, will solidify as soon as it goes bad even if it is not heated. protein
Acid will be produced after deterioration, and acid can solidify milk. Although yogurt solidified by lactic acid bacteria can be eaten, it is better not to eat naturally deteriorated and solidified milk, because we don't know what kind of bacteria it will contain.
Why do water droplets splash in hot oil?
The suitable temperature for frying food in oil is generally around 160℃~200℃. At this time, just wait.
In order to put a small amount of water attached to food into high temperature at once, we know that water boils at 100℃
Teng. The boiling of liquid is vaporization. At this time, its volume has not only changed greatly, but also changed greatly.
It changed in a short time.
A small amount of Ben enters a large amount of high-temperature oil, and the water will explode and vaporize. That's it, CHO.
The oil around was splashed, so the phenomenon of "oil splashing" appeared.
Explosive is a kind of violent explosive. It can explode because the main component of explosives is nitroglycerin.
It consists of carbon, hydrogen, nitrogen and oxygen. When these things explode, they are all caused by drastic chemical changes.
The volume of generated gas suddenly increases and explodes.
When frying food, a small amount of rapidly evaporating gas stirs up the surrounding liquid in a very short time, resulting in the phenomenon of "oil leakage".
The second article
The science around you
There is a lot of science around us, have you found it? Drinking water should be plain boiled water: drinking milk, soybean milk, various drinks and soup can't replace plain boiled water. Because milk, soybean milk and various drinks all contain a lot of water, but they also contain a certain amount of protein, sugar and salt. Protein, too much sugar and salt will increase the demand for water. Coffee and tea can't replace water, both of them have diuretic effect. Drinking too much will make people make ends meet, leading to water shortage in the body. Therefore, drinking water is best to drink boiled water. Eat less sweets: Eating too much sweets is easy to cause myopia, because the sugar in sweets needs a lot of vitamin B 1 when the human body metabolizes. If the sugar intake in the body is too high, the vitamin B 1 will be relatively insufficient. In addition, excessive intake of sugar reduces calcium in the human body, which leads to weakening of eyeball elasticity and aggravation of myopia. Furthermore, the latest research shows that eating too many sweets can easily shorten the maturity cycle of muscles, liver and nervous system of human body, especially the elderly, and accelerate aging, which is equivalent to "chronic suicide". When it rains heavily, thunder and lightning, outdoor children should never run under the tree to hide from the rain, and don't touch anything made of metal. Otherwise, it will cause the danger of lightning strike and seriously endanger life safety. Because, metals and trees wet by rain will conduct electricity! There are many sciences around us. As long as you pay attention to them, you will find more scientific knowledge. Teacher's comment: You are a careful child. You are good at observing life and can keenly capture every knowledge in life. You are really a potential student. The beginning of the article is concise and appropriate, and the end responds to the beginning, which is both topical and intriguing. The story of the case is rooted in life, and the analysis is thorough and reasonable, which is more convincing. The deficiency is that a few sentences are not perfect: "sweets will promote the development of myopia" is changed to "eating too much sweets will easily cause myopia" Read it again and see if it is more appropriate. Excessive intake of sugar will reduce calcium in the human body, thus weakening the elasticity of the eyeball. "Don't be outside" should be changed to "in addition" or "in addition", and the word "and" should be removed (Xue Le China is a special teacher
The third article
The science around you
One night, I was helping my mother cook dinner. My mother asked me to unscrew the newly bought soy sauce bottle, but I couldn't.
I asked my mother, "Mom, why can't the soy sauce bottle be unscrewed?" Can you help me unscrew it? "
Mom said, "Use your head, I won't help you twist it."
I said angrily, "Mom, why don't you unscrew it for me?" Mother said, "Think again, I won't tell you." I can only think about it. I thought it should belong to science. So, I began to turn over the science books I had studied unhappily.
Suddenly, I turned to the lesson that heat expands and cold contracts. My heart is sweeter than eating honey and happier than getting 100. I said to myself, "let me try this expansion and contraction!" " It's no use watching you swell with heat and shrink with cold. Today, I'm going to test your ability to expand when heated and contract when cooled. "
Say, just try it in the kitchen. Put some hot water first, soak the soy sauce bottle in hot water for five minutes, and then rinse it with cold water. It's easy to unscrew. I think: Is there so much scientific knowledge hidden in human life? Is this scientific knowledge just waiting for us to dig?
After this incident, I sincerely thank science. It helps me to make progress and grow.
I love you, science.
5. How many questions should math diary write in Grade Three? In grade three, math diary can write a topic of about 200 to 300 words. This afternoon, my mother and I went shopping in the supermarket. When we finished buying what we needed, we were about to leave. I saw sausages on the shelf, so I asked my mother to buy some sausages, and my mother agreed. But just a few steps, I saw a bag of the same brand on the shelf. I hesitated. Suddenly, my mind turned and I understood. I just need to compare and see which one is cost-effective. So I started to calculate: if I buy 10 pieces in retail, each piece costs 40 cents, which is equal to 4 yuan, and the whole package costs 4.30 yuan, which is 30 cents more, so I decided to buy it in bulk. I told my mother about my calculation process.
6. In the third grade of primary school, I wrote a post-reading feeling, read an article about science and technology, and wrote a post-reading feeling popular science article. During the summer vacation, I read two thick stories in the kingdom of science, which contained many wonderful stories and essays on popular science books.
For example, why does garlic have the function of bacteriostasis and disease prevention? Where do most coconut trees grow? Why vegetables get sick and so on. These stories helped me broaden my horizons, broaden my knowledge, enliven my thinking and improve my thinking ability.
It also tells the story of celestial bodies, the turbulent changes of wind and rain, the life and style of the earth, the movement, composition and change of matter, the meticulous and magical mathematics, the survival and development of animals and plants, the structure and mystery of the human body and so on through interesting stories and exquisite illustrations. They are not irrelevant, but integrate scientific knowledge into the story.
Let me learn the sunshine and rain of scientific knowledge while the story is fun, and dispel the fog of doubt in my heart. Stories in the Kingdom of Science spent a pleasant summer with me, which also cultivated my persistence in learning, loving and applying science and my determination to climb the peak of science.
7. Write a composition about scientific knowledge in life in the third grade of primary school.
Why does milk have a layer of skin after heating?
The skin floating on the surface of milk is solidified, protein. Milk contains the place where cattle grow and develop.
There are essential nutrients, and protein is one of the most important nutrients.
Once heated, protein will solidify. Boiled eggs will solidify because they are inside.
Protein is solidified. Protein in milk will also be solidified by heating.
Protein, especially protein of milk, will solidify as soon as it goes bad even if it is not heated. protein
Acid will be produced after deterioration, and acid can solidify milk. Although yogurt solidified by lactic acid bacteria can be eaten, it is better not to eat naturally deteriorated and solidified milk, because we don't know what kind of bacteria it will contain.
Why do water droplets splash in hot oil?
The suitable temperature for frying food in oil is generally around 160℃~200℃. At this time, just wait.
In order to put a small amount of water attached to food into high temperature at once, we know that water boils at 100℃
Teng. The boiling of liquid is vaporization. At this time, its volume has not only changed greatly, but also changed greatly.
It changed in a short time.
A small amount of Ben enters a large amount of high-temperature oil, and the water will explode and vaporize. That's it, CHO.
The oil around was splashed, so the phenomenon of "oil splashing" appeared.
Explosive is a kind of violent explosive. It can explode because the main component of explosives is nitroglycerin.
It consists of carbon, hydrogen, nitrogen and oxygen. When these things explode, they are all caused by drastic chemical changes.
The volume of generated gas suddenly increases and explodes.
When frying food, a small amount of rapidly evaporating gas stirs up the surrounding liquid in a very short time, resulting in the phenomenon of "oil leakage".
8. How to write science in my eyes? Technology does not exist only in great things. In fact, there are some tiny details around us, from which we can find the existence of technology.
I have had personal experience, and that has to start from last year. It was a Sunday and I went to play in my uncle's new house.
When we walked to the front of the gate, I saw my uncle already at the door. He took us upstairs. When I came to the door, I found that my uncle's door was a bit special. There is a crack under the handle and there are two buttons next to it. I asked my uncle, "Uncle, why is your door so special?" Uncle smiled and said, "Look!" I saw my uncle press a green button and then took a card out of his pocket and stuffed it into the seam. The door opened and we went in.
I was puzzled, so I asked my mother, "Mom, why is the door of my uncle's house so special?" Just open the card * * *, unlike our home, you need a key? " Mom thought for a moment and said, "Well, I don't know. Ask dad! " "I ran to ask my father. Hearing this, my father touched my head and said, "Haha, I know, but I won't tell you. Find it yourself, so remember to stay in prison. " I listened and stopped asking.
When I got home, I searched for a long time in the bookcase and finally found "100,000 Why", but there was nothing on it. I had to check the computer and finally found the answer. It turns out that this kind of door is called Carmen. The password on the card was entered through the door. After pressing the green button, the password will be displayed. Once the card is inserted, the password will be compared with the password on the card. If it is correct, the door will open automatically.
I also know high-tech doors such as voice control doors and phase detection doors. Dad was right. I don't think I will forget this knowledge.
Haha, this technology is really interesting. There are many technologies around you, and you will find them as long as you pay attention.
I think, through this matter, I will love to observe the technology in my life more.