Sometimes, when we watch TV, do we feel a little itchy and want to take pictures as a souvenir when we see beautiful pictures and things we like? However, when we really want to shoot, will it be unclear? Don't worry, I'll tell you a little trick: when taking pictures on TV, turn off the camera flash and indoor lighting, so that the photos taken will be clearer. Because the reflected light of the flash lamp and the illuminating lamp on the TV screen will interfere with the transmitted light of the TV picture.
Do you like watching movies? Do you know how the movie is played? I know: when watching a movie, you can see the picture on the screen from all angles because the screen diffuses light.
The old man's needle hardened, so she rubbed it on her hair. Do you know why? This is actually lubrication to reduce friction. People's hair contains grease. When the needle wipes the hair, it is equivalent to adding lubricating oil, which can reduce friction and make it easy to wear the needle.
There is a lot of science in life: there will be some water in the beverage bottle taken out of the refrigerator, which is actually formed by the liquefaction of water vapor in the air when it meets the cold bottle, and the hot water will emit "white smoke". In fact, it is water vapor formed by water gasification. When it rains or sprays water, a rainbow will appear. In fact, it is formed by water droplets refracting sunlight. ...
In fact, in life, there are many, many sciences we encounter, but if you want to really understand science, it depends on whether you observe it carefully.
There is science everywhere in life, but we don't pay attention to it. People's daily life is inseparable from science. As for production, labor, sports, health and military affairs, science is even more needed. "Proud of advocating science and ashamed of ignorance" There are many established common sense in daily life, all of which are the experiences of predecessors. So we mechanically think that these common sense of life is correct. You often do it without thinking. Over time, it becomes a habit and makes your life troublesome, because these so-called "experiences" and "common sense" are just contrary to common sense in life. To believe in science, only by respecting it can we avoid taboos and be less troubled by it.
It's cold in winter, and the glass bottle cap often can't be unscrewed. No matter how hard it is. Experienced people can easily unscrew the bottle cap by baking it on the fire. Do you know why? This is the reason why it expands with heat and contracts with cold. When the weather is cold, the bottle cap shrinks and tightly bites the bottle mouth, which is not easy to unscrew. After the fire is heated and expanded, the bottle cap becomes loose and can be opened without much effort.
The old man's needle hardened, so she rubbed it on her hair. Do you know why? This is actually lubrication to reduce friction. People's hair contains grease. When the needle wipes the hair, it is equivalent to adding lubricating oil, which can reduce friction and make it easy to wear the needle.
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! This makes use of the living conditions of microorganisms in the air.
Some foods can't be heated at high temperature, otherwise it will affect their nutrition and taste. For these foods, we can quickly heat them to a certain temperature (generally 60℃~ 85℃) 15 ~ 30 minutes, and then quickly cool them. This can kill most microorganisms in food and keep the original flavor. This heating method is called Pasteur disinfection, which was invented by French scientist louis pasteur.
Science should study various natural phenomena and find out the causes and laws of their emergence and development. Every little problem may lead to scientific discovery. Lsaac Newton was curious about the landing of apples and discovered the law of everything. James watt improved the steam engine by jacking up the lid of the pot after the water boiled. As long as we pay attention to observation and start exploring the problems around us, we can all enter the world of science. Science is all around us.
The world we live in is both mysterious and interesting. We need to explore its mystery and uncover its true colors. Scientific knowledge is an important part of scientific literacy, and scientific inquiry is a more scientific way for us to acquire knowledge, which can make us have a deeper understanding of science and scientific concepts and things. Technology has already penetrated into our lives and integrated into one.
It is integrated with our life because it is closely related to everyone. There are sayings like "scientific fitness" and "scientific health preservation" everywhere in life. It actually embodies the practicality and instrumentality of popular science in public consciousness.
I think middle school is the golden age to cultivate scientific interest and innovation ability. Scientific inventions and creations are everywhere around us. As long as we analyze carefully, make bold assumptions, use our imagination and dare to innovate, then every teenager of us may become a scientist.
I am not proficient in science, but I still have some contact and understanding of science. Once, I poured different amounts of water into the same cup, knocked it a few times and found that the sound was different. I went online (high-tech, very useful for the benefit of mankind) to find out why. It turns out that knocking causes the cup to vibrate, and the cup vibration drives the water surface to vibrate, thus causing the air column to vibrate. The air fluctuates, bounces back after hitting the water surface, and forms a standing wave together with the original wave (our common stringed instruments also rely on the principle of this standing wave to emit sounds of different frequencies), thus making sounds. Same. Both the water column and the air column in the cup are vibrating, but the frequency and amplitude are different. In fact, this profound scientific principle is around us, and we should learn to use it constantly for the benefit of mankind!
We should always keep a sense of science and technology, actively participate in daily scientific and technological activities, look for science around us, learn to solve problems in life by scientific methods, and make life full of scientific fun!
Mom cooks in the kitchen on weekends. Suddenly, the oil in the pot burned. I saw it and shouted, "mom, water it!" " "Mother didn't go to get water, but quickly picked up the lid. After a while, the fire went out. I was surprised to ask my mother, "Firemen's uncles always put out fires with big waterwheels. Why not use water? Mother smiled and said, "Fire fighting doesn't always use water, especially when the oil is burning. Because oil is lighter than water, pouring oil into the pot will explode, which will not only fail to put out the fire, but also easily lead to a bigger fire. "My mother also told me that fire needs oxygen. After the oil pan caught fire, it was quickly covered with a lid. After a while, the oxygen in the pot disappeared and the fire went out. " Deformable door "The door of my room is a solid wooden door, which is very beautiful and good." There are always a few days in summer when it is disobedient, and it is very laborious to close the door, as if it has gained weight; It seems to be thinner in winter, and there is always a small crack when closing the door. I asked my father what was going on, and my father explained, "It may be that the wood was not completely dry when the uncle worker made the door. In summer, when the weather is hot and the temperature is high, the wooden retractable door will become fat and won't close. In winter, when the weather is cold and the temperature is low, the wood will shrink, the door will become thinner and it will not close well. This is why it expands with heat and contracts with cold. " After listening to my father's words, I feel that there is science everywhere in my life. I must study science well!