One of my scientific attempts
There is science everywhere in life. Without science, sometimes even doing a simple thing will become troublesome.
Once, my friends and I played table tennis in the playground under our house. Originally, we were having fun! Suddenly, my "naughty" brother ran out to scare me. He could have caught the ball. Because of my distraction, I flew behind us. "Bang-"the sound of table tennis falling, followed by a sound. I turned around as soon as I heard such a strange noise. It was a passer-by who accidentally stepped on table tennis. At this point, it has "withered". Seeing this scene, my friends and I can't help sighing. Every time table tennis is "flat", we can't finish playing. You can only buy one more, which is a waste of money! Thinking about it, huh? Didn't the science teacher say that everything expands and contracts when it is cold? So I brought cold water to pour table tennis. However, the next scene made us extremely disappointed. Table tennis was beaten by cold water and didn't swell up, but it was even more "flat". I was so angry that I spilled hot water on the table tennis. In a short time, the table tennis miraculously expanded and immediately recovered. I breathed a sigh of relief, only to know that this table tennis is an exception! When he is cold, he does not expand and contract when he is hot, but expands and contracts when he is hot.
After that experiment, I realized that science is not very profound knowledge. In life, as long as you observe carefully, you can also find different sciences.
Where did you read this composition? Is it on synchronous composition?
2. My first scientific common sense composition, about 500 words.
Give you a straw, an ordinary straw for drinking fruit juice, and give you a potato, a fist-sized potato just bought from the vegetable market.
Excuse me: can you penetrate potatoes with a straw? Can't! You could say that. What would happen if you were given an auxiliary tool-a cup? I was reading a popular science magazine at noon today and saw an article entitled "Penetrating potatoes with straws".
I find it incredible. Potatoes are hard, the fragile straw ... thinking about it reminds me of the classic advertising word "anything is possible"
So I prepared the experiment with the mentality of overthrowing this statement and witnessing the miracle. To tell the truth, I am extremely ambivalent, but most of them still can't do it.
Seeing is believing, and then driven by curiosity, I found a cup, a potato and a straw. I first put the potato rack on the cup, then grabbed the straw with four fingers of my right hand, then buckled the top of the straw with my thumb, and finally stuck it hard-the straw Huo Ran passed through the potato.
I can't believe I rubbed my eyes, but I still kept the graceful posture of straw and potatoes. I still don't believe it. I think of magic, which reminds people that when they see it with their own eyes, they will have hallucinations.
I don't believe my eyes anymore. I called my mother, and she didn't believe me, but we changed straws, potatoes and cups. We did several experiments and the results were the same. I have to believe it's true.
Later, I understood that the key of this experiment is to fasten the top of the straw with your thumb. In this way, the straw cut off from the airflow becomes extremely hard enough to penetrate the potato.
I have to admit how ridiculous my "hypothesis" was before the experiment. A slender straw really has the ability to penetrate potatoes.
This little experiment woke me up. In life, how many "impossibilities" exist only in the brain and not in the real world.
And I, because of the "impossible" in my heart, missed many opportunities to try! When the straw penetrated the potato, it also penetrated the prejudice in my heart. Science is around, and we should learn to try to believe.
My first scientific knowledge composition, about 500 words.
Give you a straw, an ordinary straw for drinking fruit juice, and give you a potato, a fist-sized potato just bought from the vegetable market. Excuse me: can you penetrate potatoes with a straw?
Can't! You could say that. What would happen if you were given an auxiliary tool-a cup?
I was reading a popular science magazine at noon today and saw an article entitled "Penetrating potatoes with straws". I find it incredible. Potatoes are hard, that fragile straw ... think about it, and I think of that classic.
The advertising slogan "Anything is possible". So I prepared the experiment with the mentality of overthrowing this statement and witnessing the miracle. To tell the truth, I am extremely ambivalent, but most of them still can't do it. Seeing is believing, and then driven by curiosity, I found a cup, a potato and a straw.
I first put the potato rack on the cup, then grabbed the straw with four fingers of my right hand, then buckled the top of the straw with my thumb, and finally stuck it hard-the straw Huo Ran passed through the potato.
I can't believe I rubbed my eyes, but I still kept the graceful posture of straw and potatoes. I still don't believe it. I think of magic, which reminds people that when they see it with their own eyes, they will have hallucinations. I don't believe my eyes anymore. I called my mother, and she didn't believe me, but we changed straws, potatoes and cups. We did several experiments and the results were the same. I have to believe it's true.
Later, I understood that the key of this experiment is to fasten the top of the straw with your thumb. In this way, the straw cut off from the airflow becomes extremely hard enough to penetrate the potato.
I have to admit how ridiculous my "hypothesis" was before the experiment. A slender straw really has the ability to penetrate potatoes.
This little experiment woke me up. In life, how many "impossibilities" exist only in the brain and not in the real world. And I, because of the "impossible" in my heart, missed many opportunities to try!
When the straw penetrated the potato, it also penetrated the prejudice in my heart. Science is around us, we should learn to try to believe!
4. Write a second-grade composition with scientific common sense
Five ways to remove carpet stains:
1. Oil smoke trace. Scrub with a brush dipped in concentrated salt water several times; Cotton yarn can also be used to remove high-purity gasoline.
2. Juice stains. You can soak the stain with 80% ammonia solution, and then brush it off with a brush dipped in ammonia solution.
3. Ink. Sprinkle some fine salt powder on the dirty place and then brush it off with wet soapy water; Old ink stains should be soaked in fresh milk, and then scrubbed repeatedly with a brush dipped in fresh milk.
4. Traces of fruit wine and beer. Wipe with cotton yarn or soft cloth dipped in warm washing powder solution, and then clean with warm water and a small amount of edible vinegar solution.
5. Oil stains on animals and plants. Soak cotton yarn in high-purity gasoline and wipe it repeatedly; You can also use detergent to brush.
Three methods of quick cleaning range hood;
The range hood is a good helper in the modern family kitchen, but how to clean the range hood often makes the family nervous. Here are three simple cleaning methods:
1. Steam washing method of pressure cooker. Boil the cold water in the pressure cooker, take the low-pressure valve when continuously discharging steam, open the range hood, and aim the steam water column at the rotating fan blades. As high-temperature steam continuously rushes into the fan blades and other parts, oily sewage will flow into the waste oil cup along the way until there is no oil in the oil cup.
2. Soaking with detergent and vinegar. Remove the oil smoke extraction impeller, soak it in warm pot water mixed with 3-5 drops of detergent and 50 ml of vinegar for 10-20 minutes, and then scrub it with a clean rag. The shell and other parts are also cleaned with this solution. This method has no damage to human skin, no corrosion to equipment, and the surface remains after cleaning.
3. Soap surface coating method. Soap is made into paste and then coated on the surface of impeller and other devices. After the range hood is used for a period of time, the impeller and other devices are removed and wiped with a rag, and the oil will fall off.
Excellent method of polishing stainless steel pool;
1. Wipe with discarded plastic wrap. Roll the used plastic wrap into a ball to wipe the inner wall of the swimming pool. You will find the swimming pool bright and clean. It's a pity that the plastic wrap was thrown away once before.
2. Wipe with a plastic bag filled with fruit, roll the collected plastic bag for packaging fruit into a ball, and put some detergent where it touches, the effect will be better.
3. Soak the towel in beer, and then pour it into the sink, which can have a quick cleaning effect.
How to prevent the collection of wool clothes from being eaten by insects;
(1) Before collection, remove dirt and dust, and then put it in a cool and ventilated place to dry. If possible, it can be ironed to prevent moths from breeding and achieve the purpose of killing insects and sterilizing.
(2) All kinds of woolen clothes should be hung with hangers and stored in the wardrobe. If there is no hanging condition, it should be wrapped in cloth and put on the top of the suitcase. When stored, the reverse side should be as outward as possible. This has two advantages: first, it can prevent weathering and fading; Second, it is more conducive to moisture and insects.
(3) Pure wool fabric is acid-resistant and alkali-resistant, and it is easy to be eaten by insects, while moth balls and sanitary balls are effective insect repellent. Wrap mothballs or health balls with cloth, put them around the wardrobe or hang them in the cupboard. Generally, moths will not occur.
(4) Woolen clothes should be stored in a ventilated place, and the clothes should be dried several times according to the seasonal changes and storage time. Long-term sealing without ventilation is the cause of moth-eaten.
In daily life, people want the air in their rooms to be fresh, but for some reasons, there will always be some peculiar smell in the rooms. If it is not eliminated, it will not only affect indoor air and human health, but also create a bad mood for yourself. What do you think are the common ways to eliminate indoor odor?
There is a musty smell in the rainy season every year, and the room is very humid. The suitcases, wardrobes and drawers in the room often smell musty. You can put a piece of soap in it to remove the musty smell, or you can put the sun-dried tea residue into a gauze bag and distribute it everywhere, which can not only remove the musty smell, but also emit a faint fragrance.
The taste of cigarettes is modern. Smoking seems to be a trend for both men and women. Indoor smoking is full of smoke, which is harmful to health. If you realize this problem, you can wave or light candles with gauze dipped in vinegar indoors, and the smell of smoke will be eliminated.
Kitchen smell When cooking in the kitchen, all kinds of flavors of food are very strong. If you put a little vinegar in the pot and heat it to evaporate, you can eliminate the smell in the kitchen.
The newly painted walls or furniture have a strong smell of paint. To remove the smell of paint, you only need to put two pots of cold salt water indoors for one or two days to remove the smell of paint, and you can also soak onions in the pots, which is equally effective.
Cooking with kerosene stove or honeycomb coal will produce black smoke when burning. If a few drops of vinegar are added to kerosene or honeycomb coal, the smell of smoke can be reduced or eliminated.
5. Composition of scientific knowledge
After reading 100,000 Why, I think this set of books is very good. This set of books includes mathematics, physics, chemistry, animals, human science, earth science, universe science and environmental science.
Volume, information science volume, engineering science volume and index data volume. 100,000 Why is very suitable for teenagers. There are all kinds of questions and answers in it. For example, why is there a positive value after tossing a coin many times?
The number of times on the front and back is roughly equal. In the process of work or study, there are bound to be some problems. We should read more books like 100,000 Why. With the rapid development of modern science, people have to understand it.
Understanding the world requires more and more scientific knowledge. Under the new historical conditions, if you are ignorant and backward and lack basic knowledge, you may be confused by some fake science and fall into blind superstition. To this end, I
We must strengthen our study, improve our quality and expose the true face of pseudoscience with correct scientific ideas, methods, knowledge and technology.
6. Composition: "My Scientific Attempt" is about 500 words.
Science teachers still come into the classroom with lesson preparation books, lesson preparation materials and textbooks.
The difference is that he brought a big plastic bucket today. The plastic bucket was put aside, and through the slightly blue skin, I clearly saw the tripod assembled inside, as well as the iron sand net, beaker, thermometer, alcohol lamp and, of course, the matches in the bottle cap.
"Today, let's make a scientific fact ..." "Me, me, me!" Before the teacher could say the word "exam", the students raised their hands in a conditioned way. But this time, we are better. In less than 5 seconds, our right arm was struck by lightning and happily placed on our left hand.
"Well, good, good this time, that, that and you, go to the podium and observe the experiment!" The science teacher standing in front of me pointed at my forehead. I habitually took a piece of paper and a pen and walked onto the platform.
I saw the science teacher take the assembled tripod to the podium and take out the iron sand net cover. The beaker filled with hot water naturally stood up. When the lighted alcohol lamp was placed under the beaker, the thermometer was already soaked in water.
"The current temperature is 27 degrees Celsius!" I picked up the brush and wrote it down. "It's 37 degrees Celsius now!" Oh, my God, it's only been a minute, and the temperature has risen so fast? I think, if people who speculate in stocks can see this experiment, they will definitely think: If the "temperature" of the stock market is as good as that of a thermometer! Seven minutes later, I saw that the water in the beaker began to steam and the water surface fluctuated slightly. The temperature is 68 degrees Celsius.
In the next minute, the temperature rose more slowly, only 3 degrees Celsius. At this time, there are some tiny dregs in the water from bottom to top, which are secreted and brought out by the water, and there are several small blisters, which are very small.
Three minutes passed, during which the thermometer rose by 1 1 Celsius! At this time, the bubbles coming out of the water are more and more urgent, spinning a little bit, as if eager to fight for something. In five minutes, the temperature is 89 degrees Celsius! At this time, when you look at the water level, you can see layers of ripples rolled up from the bottom, which are vague and like layers of mud.
At this time, observe the scale of beaker water, which is less than before 1 cm! It turned out that the water of 1 cm was naughtily lifted into the air by steam! When the temperature reached 90 degrees Celsius, the students said in surprise, "It exploded-". Just then the bell rang, which almost scared me to death. This is the end of the experiment. To tell the truth, I really want to see what the students' expressions, teachers' eyes and experiments will look like when the temperature reaches 100 degrees Celsius.
7. Composition of scientific knowledge
Today, I added a new and very interesting toy. Do you want to know how it came from? Let me tell you something! This little toy is called colorful optical fiber lamp, which was made in the science experiment class of Little Newton's class on Saturday. Let me tell you something about optical fiber!
Optical fiber has many functions, including telephone and TV. Optical fiber communication TV can be used as TV fax phone. When you talk, you can see me and I can see you. Fax telephone can also be used for TV teaching. In most teaching, only teachers can attend classes on TV, and students can watch in front of TV, so they can't ask each other questions. If you use fiber-optic "two-way" TV, it is like a teacher having a class face to face with students in the classroom. It is convenient to reduce the difficulty of communication between teachers and students.
Do you want to know how doctors check stomach trouble? Let me tell you the answer! It is an instrument made of optical fiber, inserted into a person's stomach, and the computer can display the situation in this person's stomach. If you encounter incurable diseases, you can also consult with computers. Teacher Zhang told us: "In the next few years, the new optical fiber technology will have a better prospect and its application will be more brilliant."
The teacher also taught us to make colorful fiber-optic lamps. First, connect the two wires of the colorful light-emitting tube with the battery, then take out a pair of optical fibers, plug one end into one end of the small tube, and erect the other end, thus making the colorful light-emitting tube into a small tube. Turn on the switch, colorful light-emitting tubes illuminate the optical fiber, suddenly emitting bright light one by one, constantly changing colors, colorful and beautiful.
I like the magical and interesting scientific knowledge in Newton's class, and I like this fun toy-colorful fiber-optic lamp.
8. Write down scientific knowledge.
Life science tips 1. Eating spicy food will make you feel spicy to death. As long as you put a little salt in your mouth, hold it, spit it out and gargle, it won't be spicy; ? 2. Yellow teeth, you can chew peanuts in your mouth and brush your teeth for three minutes, which is very effective; 3. If there is a small area of skin damage or burns, immediately apply a little toothpaste to stop bleeding and relieve pain; ? 4. Always leave ugly tea stains in the cup filled with tea, and wash it with toothpaste, which is very clean; ? 5. Open your mouth slightly when you look up at the eye drops, so that your eyes will not blink; ? 6. If there is an ulcer in the mouth, stick it on the ulcer with vitamin C, and it will basically be fine after the ulcer dissolves; ? 7. Small dust enters your eyes, close your eyes and cough a few times, and the dust will come out by itself; ? 8. After washing your face, gently apply some fine salt on both sides of your nose with your fingers, and then rinse with water, so that blackheads and acne will be removed and pores will become smaller; ? 9. When you have just been bitten by a mosquito, it doesn't itch when you apply soap; ? 10. If the throat and gums are inflamed, cut the watermelon into small pieces at night and eat with salt. Remember that it must be at night, when the symptoms will be relieved and the next day will be fine; ? 1 1. The hair dryer blows at the label, and when the glue of the trademark is hot, the label is easily torn off; ? 12. If you are afraid of wrinkling when traveling with clothes, you can roll up everything; ? 13. Drinking vinegar when burping will get immediate results; ? 14. Eat something that smells bad, such as garlic and stinky tofu, just eat a few peanuts; ? 15. Treat cough, especially dry cough. Before going to bed at night, fry eggs with pure sesame oil, add a little more oil, and don't put any seasoning. Sleeping in hot weather and eating for several days have obvious effects; ? 16. MM with long and thick wrists cannot wear thin bracelets. You should put a plastic bag on your hand and wear a bracelet. It's very easy to wear and won't hurt your hands. Take it off in the same way; ? 17. Chestnut skin is difficult to peel. Peel off the shell first, then turn it in the microwave oven, take it out while it is hot and rub it, and the skin will fall off; ? 18. When arranging flowers, drop a drop of detergent in the water for several days; ? 19. Steam walnuts in a pot for 10 minutes, then take them out and break them in cold water to take out the complete peach kernels; ? 20. Put the shrimps in a bowl, add a little salt and edible alkali powder, rub them with your hands for a while, then soak them in clear water, and then rinse them with clear water, which will make the fried shrimps transparent as crystal, refreshing and delicious; ? 2 1. When frying meat, first soak the meat in baking soda water for more than ten minutes, then pour out the water and try it again. It will be tender and smooth when fried; ? 22. Soaking the remaining tea leaves in water for a few days and then pouring them on the roots of plants can promote the growth of plants; ? 23. Dry the remaining tea leaves and smoke them in the toilet or ditch, which can eliminate the stench and drive away mosquitoes and flies; ? 24. uncooked rice re-cooking method: you can use chopsticks to tie some holes in the rice that go straight to the bottom of the pot, sprinkle a little yellow wine and stew it again. 25. If it's just a noodle clip, turn the noodles to the middle and simmer; ? 26. Clever removal of greasy screen windows: Put the cigarette butts left after washing clothes and smoking in water, and use them to clean glass windows and screens after dissolution. The effect is really good; ? 27. As long as you put a small piece of chalk in the jewelry box, you can keep the jewelry shiny; ? 28. Self-adhesive traces on the surface of tables and bottles can be wiped with wind oil essence; ? 29. Always carry a small dry battery in your bag when you go out. If the skirt is charged with static electricity, wipe the battery positive electrode on the skirt several times to remove static electricity; ? 30. No matter where your shoes rub your feet, you should apply a little white wine to the place where your shoes rub your feet to ensure that you don't rub your feet. 3 1. When mixing vegetables, if you have to blanch, you'd better make full use of the water for blanching good dishes.
If you cook jiaozi, you can put a proper amount of water in the meat stuffing, which not only ensures the nutrition, but also makes the dumpling stuffing delicious and fragrant. ? 32. In summer, feet are prone to sweating. Soaking feet with light salt water every day can effectively deal with sweaty feet; ? 33. Sunbathing after swimming in summer can prevent diseases such as skin strain; ? 34. In summer, pillows are prone to damp and mildew, and frequent contact with pillow cores is good for health; ? 35. Eat more wet spleen such as glutinous rice porridge, which can prevent heatstroke and damp; ? 36. Anti-insomnia: Talk less before going to bed, avoid drinking strong tea, don't use your brain before going to bed, and wash your feet with hot water and vinegar; ? 37. Honeysuckle has the effect of dispelling wind and dampness. Honeysuckle can be mixed with honey to relieve summer heat after being decocted in water to cool the juice; ? 38. Drinking tea after eating too greasy food can discipline nerves and promote fat metabolism; ? 39. Lack of sleep will make you stupid. You need to sleep for eight hours every day. Having a nap habit can delay aging. ? 40. Hands tend to become dry and rough. Soaking your hands in vinegar for ten minutes can protect your skin. ? 4 1. Wipe the mat in summer, and wipe the mat with water dripping from flower dew, which can keep the mat fresh and clean. Of course, it is best to wipe along the grain of the mat, so that the toilet water can penetrate into the grain gap of the mat, so that the cool and comfortable feeling will last longer; ? 42. Eating more acidic fruits and vegetables such as tomatoes and citric acid for breakfast is beneficial to nourishing the liver; ? 43. When washing your hair or taking a bath, adding five or six drops of toilet water to the water can play a good role in cooling and sterilizing, eliminating malnutrition and relieving itching; ? 44. Grapes contain sleep-promoting hormones, which are helpful for sleep when eaten regularly; ? 45. Drinking tomato soup in summer can not only get nutrition, but also replenish water. Tomato soup should be cooked and cooled before drinking. Lycopene contained in it has certain anti-prostate cancer and myocardial protection effects, and is most suitable for men to eat. Eating acidic substances and brushing your teeth immediately will damage your teeth health; ? 46. When the flesh is broken due to trauma, apply toothpaste to the wound to diminish inflammation and stop bleeding, and then bandage it. As a temporary first-aid medicine, medicinal toothpaste has the most remarkable effect; ? 47. Spraying white vinegar on the chopping block and washing it for half an hour can not only sterilize but also deodorize; ? 48. Drinking yogurt can relieve irritability after drinking. Yogurt can protect gastric mucosa, delay the absorption of alcohol, and is rich in calcium, which is particularly effective in relieving irritability after drinking; ? 49. When leather shoes are moldy for a long time, you can wipe them with a soft cloth dipped in alcohol and water (1: 1). ? 50. When you have a headache or dizziness, you can apply toothpaste to your temples, because toothpaste contains menthol and clove oil, which can relieve the pain; ? 5 1. Insert the candle into the birthday cake after freezing for 24 hours, and the candle oil will not flow down when it is lit; ? 52. White underwear turns yellow easily after washing. You can take a basin of water and drop two or three drops of blue ink. Soak the washed underwear for a quarter of an hour and dry it in the sun.