1. What are some common sense about science in life
Hello! There are really a lot of common sense in life. I am a woman who pays attention to life. But for busy office workers like us, although we know a lot of common sense, it is difficult to implement it. I can simply tell you some common sense in daily life that is easy to do:
1. Set the alarm 5 minutes in advance. , open your eyes, turn your eyeballs left and right, up and down in a regular and orderly manner, smile and pat your head. This has a refreshing effect. I feel much better throughout the day
2. Drink a glass of boiled water (300 to 500 ml) on an empty stomach: simply put on clothes, go to your seat and boil some boiled water for yourself, then come back and get dressed (save time) and get dressed Put on your clothes, let the boiled water cool for a while, brush your teeth and wash your face. Drink boiled water slowly (usually 30 minutes before meals)
3. Make breakfast and simply tidy up the room. Use the porridge cooking period to sort out household chores, and eat breakfast in the last 30 minutes.
4. Eat a good breakfast, pack your bag for work, and it is best not to do strenuous exercise immediately. Drink 200 ml of water around 10 o'clock (fruit is better instead) and 300 to 500 ml of boiled water 30 minutes before meals
5. For lunch, drink soup before meals to stay slim and healthy. Do not drink it during or after meals. Soup.
6. Do not walk quickly within 30 minutes after a meal, but you should stay standing. It is best to walk for 30 minutes to an hour after a meal.
7. Dinner should be similar to lunch. But dinner is light, and it is best not to have a big meal after 6 pm, which is not good for the stomach and kidneys
8. Pay attention to whether it is better to drink milk or yogurt, followed by pure milk. Don’t believe in any fruit plus milk. There is basically no nutrition when mixed together, it is just a drink that is not a drink. Drinking it will hurt your stomach. I studied dairy nutrition and have a little knowledge of life nutrition
9. I wish you a healthy living habit and a good body
2. Scientific knowledge in life
If the cover of a book that has been stored for a long time curls upward, it is because the humidity in the air is constantly changing; because the paper of the book absorbs the moisture in the air , when the air becomes relatively dry, it begins to "evaporate water" again. When the humidity in the air is high, it begins to absorb water. Such continuous absorption and evaporation of water will easily cause the "deformation" of the paper fibers, so the paper becomes It will curl up
The principle of leverage.
Using the lever principle is not only to save effort. When using chopsticks, it does not save effort, but it saves distance and makes the operation more flexible, but it takes a lot of effort (it doesn’t matter if it takes a little effort).
The power and resistance of the lever refer to the force on the lever. The power is the force of the fingers on the chopsticks, and the resistance is the force of the dish on the chopsticks. To determine the relationship between the power arm and the resistance arm of the chopstick lever, you need to find the fulcrum. The fulcrum is at the upper end of the chopstick. The power arm is smaller than the resistance arm. The chopstick is a laborious lever.
They are all laborious levers. Because the place to pick up food is on the chopstick head.
You can feel it with chopsticks.
Its fulcrum should be at the tiger's mouth (the index finger and thumb are connected).
The power is the force exerted by the fingers on the chopsticks, usually up and down in the middle of the chopsticks (even if you are very interested in it) Even if you pick it up, you can’t reach the top of the chopsticks.)
Resistance is the force that prevents the chopsticks from closing, and it generally acts on the chopstick heads. (Unless you place the dish in the middle alone, but this is not normal use)
So it is a lever whose power arm water is smaller than the resistance arm, and it is a laborious lever.
Different people hold chopsticks in different positions, which will cause different levels of effort, but they are all levers of effort.
Small changes in procurement costs can have a huge impact on corporate profits. This impact is called the principle of procurement leverage. The principle of purchasing leverage explains the importance of purchasing cost control
3. What are the common sense of science and technology in life
1. Wash the collar of clothes: Sprinkle some salt on the collar and gently Knead and rinse with water to remove the salt. Because human sweat
contains protein, which cannot be dissolved in water, but can be quickly dissolved in table salt.
2. Make the toothbrush durable: Soak the newly purchased toothbrush in hot salt water and take it out for about half an hour to make the toothbrush durable.
3. Egg white sticks to small porcelain and glass products: If small porcelain and glass products are broken, you can use egg white to cover the two broken surfaces and seal them
and wipe off the excess around them. Egg white, after half an hour, the broken parts will be completely sticky. After being left for one or two days, even if
it is subject to a large external force, the adhesive joint will not break.
4. If pots, cups, cups and other porcelain have tea stains, oil stains, water stains, etc., you can soak them in a bowl of warm
water with peeled lemon peels. , leave it for 4 or 5 hours and then remove it. A mixture of vinegar and salt can also be used to clean it.
How to quickly untie a tangled necklace***
You can sprinkle a little talcum powder on it first and then untie it. The chain is made lubricated by talcum powder, so it can be easily separated no matter how tightly it is
wrapped.
***Methods to prevent the bath water from getting cold***
When taking a bath in winter, the water easily becomes cold, so you can add a little salt to the bathtub. Salt has the effect of temporarily blocking sweat lines
so that body heat will not be dissipated.
***How ??to eliminate cracks on plates***
You can put the plate into the pot, pour in the milk, and heat it for four to five minutes. After the milk boils, turn off the heat and take out the plate< /p>
The cracks will almost disappear.
***Moisture-proof method for biscuits***
When filling the biscuits into cans, put a piece of sugar cube at the same time. Since the sugar cubes will absorb the moisture in the jar, they will keep the cookies
crispy and delicious.
***Methods to prevent overflowing of cooked pasta soup***
When boiling, add a little cream or a little salad oil to the soup. At the same time, keep the soup boiling and do not add cold water to other noodles.
***How ??to remove soot on your fingers***
The most effective method is to scrub with lemon juice. The effect is not obvious at first, but after patiently wiping, The color
will gradually fade. If it still doesn't work, you can add a little hydrogen peroxide to lemon juice and the effect will come out.
***Method to restore a shrunken sweater to its original shape***
Pour warm water into the basin, add a small amount of household ammonia water, and then put the sweater When soaked, the soap ingredients left on the wool will melt. Gently stretch the reduced part with both hands at the same time, then rinse and dry. When it is semi-dry,
pull it apart with your hands to get the original shape, then iron it with an iron to restore it to its original size.
***How ??to remove furniture marks from carpet***
To eliminate common depression marks on carpet, try using a steam iron and spray some steam on the depression, or put a wet towel Lay it on the recessed area
and then iron it with an iron. Then use a hard-bristled toothbrush to pick up the hair in the recesses and gently brush it down.
***Do not use hot water with enzyme-added laundry detergents***
Enzyme-containing laundry detergents are most effective against protein dirt produced by the body, but when the protein is heated, it will Deterioration and clinging to
the cloth. Even though it is an enzyme laundry detergent, there is nothing you can do about it. Therefore, the upper limit of water temperature is still 30 to 60 degrees.
***How ??to prevent sweaters from shrinking***
The principle of washing sweaters is to wash them as quickly as possible. Generally speaking, the less detergent you use, the easier it is for your sweater to shrink.
Therefore, it is better to add more detergent to prevent the sweater from shrinking.
***How ??to make clear and transparent ice cubes***
Just boil the water thoroughly and pour it into the ice maker. Because impurities such as lime in the water can be evaporated in this way, the ice cubes produced will be particularly transparent.
***Secrets to making vase flowers last in summer***
Add one or two drops of bleach to the vase.
Bleach water has a bactericidal effect. Even if the water temperature is high, it can also make the flower stem cuts
less susceptible to bacteria, and the flowers will naturally last longer.
***How ??to make the house fragrant without using fragrance***
You can use your own perfume to wet the cotton with the perfume, and then wipe the light bulb in the room. When the light bulb lights up, the perfume will It will warm
and the whole room will be filled with fragrance.
***Method to revive wilted fruits and vegetables***
You can fill a large basin with water, add a small amount of vinegar and two cubes of sugar, and then put the vegetables Just put it in and soak it, then rinse it with hot water
and then immediately rinse it back with cold water to restore it to its original state.
4. What are the scientific common sense in daily life
1. For example, water must be boiled to 100 degrees.
2. The straw feels crooked when placed in the water. This is the refraction of the water.
3. Food in cans does not go bad easily. They can be stored for a long time without going bad easily. This is because the can is sealed and bacteria cannot enter.
4. Sunflowers always bloom toward the sun. The stems under the sunflower discs contain a substance called "auxin." This substance has the function of accelerating reproduction, but it is optically repulsive. Whenever it encounters light, it will run to the backlight side.
Science means learning by subject, and later refers to the study of various knowledge through refined classification (such as mathematics, physics, chemistry, etc.) to form a gradually complete knowledge system. It is the knowledge about the practice of discovery, invention and creation. It is the general name of the knowledge system for human exploration, research and understanding of the laws of change of all things in the universe.
5. A 400-word essay on common sense about science and technology
Does the development of science and technology have more benefits or more disadvantages
If you ask, the development of science and technology has more benefits or disadvantages? Needless to say, of course it’s a big win! What's the explanation? No need to explain! The 8,000-year history of Chinese civilization is ironclad evidence. History is changing every moment, and science and technology are developing every moment. Human beings learned to use or cook food from the primitive life of eating hair and drinking blood, from relying on nature to breeding and raising, from being unarmed to metallurgy and stone smelting. Isn't this all progress, isn't this all development? If the disadvantages outweigh the advantages, then why do human beings unanimously choose progress? Because only progress can make tomorrow better!
A person who does not make progress is sad, a country that does not make progress is in decline, and a world that does not make progress is dark. Only through continuous progress can human life be sublimated. God has given humans a smart brain and a pair of hard-working hands. It is precisely because humans did not sit back and enjoy the fruits of their labor, but chose to continue to make progress, that they can stand at the top of the food chain today.
Life is so comfortable, life is so pleasant, life is so wonderful, our average life span is 30 years longer than in ancient times, and we don’t even have to leave home to visit relatives and friends. Aren’t these all benefits brought to us by scientific and technological development? ?
Therefore, technology changes history. When we discuss whether the development of science and technology has greater benefits or greater harm, there is no need to question it, that is, it has great benefits! Great profit! Great profit! You say that the development of science and technology has brought about air pollution, you say that the development of science and technology has produced white garbage, you said that the development of science and technology has caused temperature warming... all things cannot be perfect. Based on these, you conclude that the development of science and technology will do more harm than good. profit? "Everything is different, everything is different." Times are different, and the problems encountered are also different. When it comes to air pollution, all provinces and cities have launched prevention plans; white garbage is treated in a unified way; car exhaust causes temperatures to rise. Scientists have also developed solar cars. . Look at now, solar water heaters, solar air conditioners, solar cells... Environmentally friendly and economical solar energy has gradually entered thousands of households. Isn't this the development of science and technology?
Although there are disadvantages, compared with benefiting mankind, the concept of scientific and technological development of environmentally friendly homes is insignificant. As long as there are disadvantages, scientists will also find ways to solve them. We cannot stop eating because of choking, and the pace of scientific and technological development will not slow down even for a moment. will stop. There is nothing wrong with the development of science and technology, it is beneficial! Just because technology has been advancing and science has been developing, cunning sophistry, general remarks, and unreasonable nonsense cannot change this truth. Science and technology change history, yes, without the development of science and technology, our lives are unimaginable. Our days are dark and dark. It is the development of science and technology that saves us. It is science that saves us from the age of water and fire.
We should respect him with awe. How can we duplicity say that scientific and technological development has many drawbacks?
Technology changes history, and knowledge changes destiny. We have entered the 21st century and an era full of high technology. Science has changed our lives, and science has changed our destiny. "Knowledge is power." Why can we, the People's Republic of China, a huge country with a population of 1.3 billion, stand tall in front of the world? Because our technology is constantly developing! Our technology is constantly improving!
The benefits of technological development outweigh the disadvantages. This is an everlasting theme!
With the development of science and technology, human civilization has taken a big step forward, from horse-drawn carriages to cars, from oil lamps to electric lamps...
6. Tips for scientific and technological life
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Original publisher: Longyuan Journal Network
1. Why do stars appear together? A flash?
We see stars twinkling, not because of changes in the luminosity of the stars themselves, but because of the obstruction of the atmosphere.
The atmosphere is between us and the stars. When starlight passes through the atmosphere, it will be affected by the density and thickness of the atmosphere. The atmosphere is not absolutely transparent; its transparency varies depending on density. So when we look at the stars through it on the ground, we will see that the stars seem to be flickering freely.
2. Why do sunflowers always bloom toward the sun?
The stems under the sunflower disc contain a substance called "auxin". This substance has the function of accelerating reproduction, but it is optically repulsive. Whenever it encounters light, it will run to the backlight side.
So when the sun rises, the sunflower stems immediately hide to the backlight side, and it seems that the entire plant is bent in the direction of the sun.
3 Why does people’s hair turn gray as they get older?
There is a substance called "melanin" in our hair. The more melanin, the darker the color of the hair. If there is less melanin, the hair will turn yellow or white. When humans reach old age, various functions of the body will gradually decline, and the formation of pigment will become less and less, so the hair will gradually turn white!
4. Why do fireflies glow?
Fireflies glow because they have luminescent devices at the end of their abdomens. The luminescent devices are filled with many phosphorus-containing luminescent substances and luminescent enzymes, allowing fireflies to emit flashes of light.
6. Why do babies cry non-stop when they are just born?
7. Scientific common sense in life
The minimum price is 0.27 yuan/day to become a member of Baidu Library, and you can view the full content in the library> Original publisher: Longyuan Journal Network 1. Why Will the stars twinkle? We see stars twinkling, not because of changes in the luminosity of the stars themselves, but because of the obstruction of the atmosphere.
The atmosphere is between us and the stars. When starlight passes through the atmosphere, it will be affected by the density and thickness of the atmosphere. The atmosphere is not absolutely transparent; its transparency varies depending on density.
So when we look at the stars through it on the ground, we will see that the stars seem to be twinkling. 2.Why do sunflowers always bloom toward the sun? The stem below the sunflower disc contains a substance called "auxin."
This substance has the function of accelerating reproduction, but it is optically repulsive. Whenever it encounters light, it will run to the backlight side. So when the sun rises, the sunflower stems immediately hide to the backlight side, and it seems that the entire plant is bent in the direction of the sun.
3 Why does people’s hair turn gray as they get older? There is a substance called "melanin" in our hair. The more melanin, the darker the color of the hair. If there is less melanin, the hair will turn yellow or white.
When humans reach old age, various functions of the body will gradually decline, and the formation of pigment will become less and less, so the hair will gradually turn white! 4. Why do fireflies glow? Fireflies emit light because they have luminescent devices at the end of their abdomens. The luminescent devices are filled with many phosphorus-containing luminescent substances and luminescent enzymes, allowing fireflies to emit flashes of light. The purpose of fireflies' light is not only for lighting, but also for courtship and warning.
8.
Best answer 1. When learning science, we should ask more questions, think more and experiment more, and be ready to use science and knowledge at any time to create a better life for mankind. 2. Observe the things around you carefully. There are many phenomena that make us curious. Please give 2 examples that interest you most and ask questions you want to know. Answer: Do this question yourself. 3. On a glass Pour more than half a cup of water into the cup, then continuously add salt and stir with a glass rod. It is found that after the experiment reaches a certain amount, the added salt no longer dissolves. What scientific conclusions can you draw from this experimental phenomenon? Answer: The solubility of water has reached the upper limit. There is a limit to the solubility of water, but the human brain has no limit. As long as we study hard, the brain can continuously dissolve scientific knowledge, but we must know that if what we learn is not absorbed You understand, it becomes a waste just like salt that has not been dissolved by water. 4. In a small mountain village with clear mountains and green waters, the village station opened a paper mill by the river in the village in order to make the village rich. A few years ago Down the river, many villages have become worthy of their name, but the river is no longer clear, but has become turbid and smelly. Please tell me your opinion on this phenomenon. Answer: A gentleman loves money. You know, on the road to creating wealth, you can only create real wealth by understanding what real gain is.
9. Looking for a scientific paper on motion and force (using physical knowledge to explain phenomena or solutions in life
Chapter 1 Sound Phenomenon Sound Phenomenon 1. Everything about the occurrence of sound Objects that are making sounds are vibrating. When the vibration stops, the sound stops. Sound is produced by the vibration of objects, but not all sounds produced by vibrations can be heard by human ears. 2. Propagation of sound between sounds. A medium is needed, and sound cannot be transmitted in a vacuum. (1) Sound must be transmitted by all gases, liquids, and solids as media. These materials as transmission media are called media. Even if the astronauts on the moon talk face to face, they still need to rely on radio. Then Because there is no air on the moon, sound cannot be transmitted in a vacuum. (2) Sound propagates at different speeds in different media. Generally speaking, solid > liquid > air, the sound propagation speed in the air is about 340 m/s 3. Echo sound propagates During the process, the sound that is reflected back by the obstacle and heard again is called echo. The conditions for distinguishing echo from the original sound: the echo reaches the person's ears more than 0.1 seconds later than the original sound. Therefore, the sound must be reflected back by obstacles more than 17m away. Only people can hear the echo. When it is less than 0.1 seconds, the reflected sound can only strengthen the original sound. The echo can be used to measure the depth of the sea or how far the sounding body is from the obstacle. 4. The sound emitted by the musical object when it vibrates regularly It is called musical sound. The three elements of musical sound: pitch, loudness, and timbre. The height of sound is called pitch, which is determined by the vibration frequency of the sound-producing body. The greater the frequency, the higher the pitch. The size of the sound is called loudness, and the loudness is related to the vibration of the sound-producing body. It is related to the amplitude and the distance from the sound source to the human ear. The quality of the sounds emitted by different sound emitters is called timbre. It is used to distinguish various sounds. 5. Noise and sources From a physical perspective, noise refers to The sound emitted when the sound-emitting body vibrates irregularly. From an environmental protection point of view, any sound that hinders people's normal rest, study and work, as well as the sound that interferes with the sounds people want to listen to, is noise. 6. Inter-sound level People use decibels to classify sound levels. 30dB-40dB is an ideal quiet environment. More than 50dB will affect sleep. More than 70dB will interfere with conversations and affect work efficiency. Living in a noise environment above 90dB for a long time will affect Hearing. 7. Ways to reduce noise can be at the sound source (silencing), during propagation (sound absorption) and at the human ear (sound isolation). Chapter 2 Light Phenomenon 1. Light source: An object that can emit light on its own is called a light source. 2. Light propagates in a straight line in a uniform medium. The atmosphere is non-uniform. When light is emitted from the atmosphere to the ground, the light is bent (mirage, when you see the sun in the morning, the sun is still below the horizon, stars 3. Speed ??of light The speed of light propagation in different materials is generally different. The fastest speed of light propagation in vacuum is: V = 3*108 m/s. The speed in air is close to this speed. In water The speed is 3/4V and 2/3V in glass 4. The application of straight line propagation of light can explain many optical phenomena: laser collimation, the formation of shadows, the formation of lunar and solar eclipses, pinhole imaging, etc. 5. Light rays : A straight line indicating the direction of light propagation, that is, draw a straight line along the propagation route of light, and draw an arrow on the straight line to indicate the propagation direction of light (the light is imaginary and does not actually exist) 6. Reflection of light Light comes from a When a medium shoots towards the interface of another medium, part of the light returns to the original medium, causing the direction of light propagation to change. This phenomenon is called reflection of light. 7. Law of Reflection of Light Reflected light, incident light, and normal On the same plane; the reflected ray and the incident ray are separated on both sides of the normal; the reflection angle is equal to the incident angle, which can be summarized as: "three lines * plane, two lines separated, two angles equal" Reasons: The incident ray determines the reflected ray, description When the word "reverse" is used, the conditions for reflection to occur: the junction of two media; the place of occurrence: the point of incidence; the result: the reflection angle in the returned original medium increases as the incident angle increases, and decreases as the incident angle increases. When the incident angle is zero, the reflection angle also becomes zero degrees. 8. Two reflection phenomena: Specular reflection: parallel light rays are reflected in a certain direction after being reflected by the interface, and the reflected light rays can only be received in a certain direction (the reflective surface is a smooth plane ) Diffuse reflection: Parallel light is reflected in different directions after being reflected by the interface, that is, reflected light can be received in different directions (the reflective surface is a rough plane or curved surface) Note: Whether it is specular reflection or diffuse reflection, follow the reflection of light
Law of Radiation 9. The optical path is reversible during the reflection of light 10. The effect of plane mirror on light (1) Imaging (2) Changing the propagation direction of light 11. Characteristics of plane mirror imaging (1) It forms a virtual image of equal size upright (2) The line connecting the image and the object is perpendicular to the mirror surface, and the distance between the image and the object to the mirror is equal. Therefore, the image and the object formed by the plane mirror are symmetrical figures with the mirror surface as the axis, that is, the plane mirror is the perpendicular line connecting the object and image. 12. Real image The difference from a virtual image is that the real image is formed by the convergence of actual light rays, which can be received with a screen, and of course can also be seen with the eyes. The virtual image is not formed by the convergence of actual light rays, but is formed by the intersection of the reverse extension lines of the actual light rays. See with your eyes, not receive with a screen. 13. Applications of plane mirrors (1) Reflection in water (2) Imaging with plane mirrors (3) Periscope Chapter 3 Lenses and their applications 1. Refraction of light Light is incident obliquely from one medium into another When two media are used, the direction of propagation generally changes. This phenomenon is called refraction of light. Refraction of light, like reflection of light, occurs at the junction of two media. It is just that the reflected light returns to the original medium, while the refracted light enters. In another medium, since light propagates at different speeds in two different materials, the direction of propagation changes at the junction of the two media. This is the refraction of light. Note: At the junction of the two media, When refraction occurs, reflection must occur. The speed of light must change during refraction, but the speed of light during reflection remains unchanged. 2. The law of refraction of light. When light enters water or other media obliquely from the air, the refracted light ray, the incident light ray, and the normal line are on the same plane. The refracted light ray and the incident light ray are separated on both sides of the normal line; the refraction angle is smaller than the incident angle; when the incident angle increases, the refraction angle also increases; when the light ray shoots vertically to the medium surface, the propagation direction remains unchanged, and the light path is reversible during refraction. . The law of refraction can be divided into three points: (1) three lines * plane (2) two lines separated (3) two angles relationship can be divided into three situations: ① When the incident light is incident perpendicular to the interface, the refraction angle is equal to the incident angle equal to 0°; ② When light is incident obliquely from air into a medium such as water, the refraction angle is smaller than the incident angle; ③ Light is incident obliquely into air from a medium such as water.