1. How about drinking boiled water? Our tap water has been chlorinated and disinfected, and the combination of chlorine and residual organic matter in the water will produce carcinogenic compounds such as halogenated hydrocarbons and chloroform.
The water is boiling, so let's take out the tap water first and put it aside for a while before burning it. Open the lid when the water is about to boil; Finally, turn off the fire 3 minutes after the water boils, so that the chlorine content in the water can be reduced to the safe drinking standard, which is the real "boiled water". 2. How about bottled water? Polyester bottles used in bottled water often contain substances that may cause chronic poisoning to human body, especially when the bottle is in a high temperature environment or not drunk in time after opening, harmful substances will penetrate into the water and endanger health.
Therefore, it is not recommended to drink bottled water often. Third, drink boiled water repeatedly, ok? Due to the limitation of manufacturing materials, the highest temperature of water in drinking fountains is generally around 90 degrees Celsius, which is not boiling or boiling water.
"But the best drinking time for bottled water is 1? 15 days, once it exceeds 15 days, there are too many bacteria in the water to drink any more, so try to drink less water from the water heater. Fourth, drink water only when you are thirsty, okay? In fact, when you feel thirsty, your body has begun to dehydrate, but the degree is very low. If you don't drink water for a long time, your metabolism will be slower and slower, and the blood viscosity will increase, which will induce various cardiovascular and cerebrovascular diseases.
Therefore, whether you are thirsty or not, you should replenish water in time. 5. Can drinks replace water? Most drinks contain more sugar, electrolytes and pigments, which have adverse effects on the stomach and intestines, slow excretion, affect appetite and have adverse effects on health.
How about drinking water in the morning? Good. Drinking water in the morning can reduce the blood viscosity, improve the metabolism speed of the body, and metabolize the garbage in the body out of the body, which is very beneficial to the body. As the saying goes, if you don't drink water in the morning, you will regret it when you get old. .
2.50 scientific tips
1. 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.
2. 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 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, 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.
3. Why do people yawn? When we feel tired, a lot of carbon dioxide has been produced in our bodies. When there is too much carbon dioxide, oxygen must be supplemented to balance the needs of the body.
Because these residual carbon dioxide will affect our body's functional activities, then the body will send out a protective reaction, so we yawn. Yawning is a deep breathing action, which will let us breathe in more oxygen and expel more carbon dioxide than usual, and it can also eliminate fatigue.
How high is the blue sky? "Blue sky" is actually the earth's atmosphere. The atmosphere surrounds the earth's air and is divided into five layers according to the air density, with a total thickness of 2000-3000 kilometers.
But most of the air is concentrated below 15 km from the ground, and the higher the air, the thinner it is. How thick the atmosphere is, how high the blue sky should be.
5. Why are there no stars in the daytime? Because part of the sunlight is scattered by the gas and dust in the atmosphere during the day, the sky is very bright and the light radiated by the sun is so strong that we can't see the stars. 6. What celestial bodies are there in the solar system? There are nine planets in the solar system.
They are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. In addition, there are many asteroids, comets and meteors in the solar system, and there are 2958 officially numbered asteroids.
The most famous comet is Halley's comet. 7. Why does it thunder? This is a natural phenomenon that negative electricity meets positive electricity.
When it rains, some clouds in the sky are positively charged and some are negatively charged. When two clouds meet, they will discharge, emit bright and bright lightning, and at the same time release a lot of heat, which will make the surrounding air heated, expand and make a loud noise. This is thunder. 8. Why can an airplane fly into the sky? This plane has two wings, like those of a bird. It has a propeller.
The wing can generate lift and lift the plane into the air; Propeller can produce the ability to push the plane forward. Therefore, the plane can fly into the sky like a bird.
33. For a quartz clock hanging on the wall, when the battery runs out and stops, its second hand often stops at the position of "9" on the dial. This is because the second hand is most hindered by the large torque at the "9" position.
9. Before water boils, bubbles in water rise and vibrate up and down due to convection. Most bubbles burst under the pressure of water, and their bursting sound and vibration sound are very loud with the container. After water boils, it is isothermal up and down, and the bubble volume increases. Under the action of buoyancy, it will burst as soon as it reaches the water surface, so the noise is relatively small.
10. Fire-water incompatible substances must reach the ignition point when burning. Because of the large specific heat of water, water can absorb a lot of heat when it comes into contact with fire, thus reducing the temperature of ignition materials; At the same time, the vaporized water vapor surrounds the burning object, making it impossible for the object to contact with air. Without air, combustion cannot be carried out. 1 1. Sit on the ground and walk for 80,000 days. Because the radius of the earth is 6370 kilometers, every time the earth makes a circle, the distance that objects on its surface "walk" is about 40003.6 kilometers, about 80000 miles.
This is a poem sung by * *, which also scientifically reveals the relationship between motion and stillness-motion is absolute, and stillness is always relative to the reference object. 12. According to the principle of lever balance, if the power arm is a fraction of the resistance arm, then the power is several times the resistance.
If the weight of the arm is very large, it is entirely possible to "dial one or two kilograms." 13. When the distance between molecules is large (more than several hundred angstroms), the attraction between molecules is very small, almost zero, so it is difficult to reassemble a broken mirror.
14. If the directions of the components are the same, the resultant force is equal to the sum of the components. 15. Tofu can't be hung with hemp rope. When the pressure is constant, if the stress area is small, the pressure will be great.
16. True gold is not afraid of fire, and truth is not afraid of argument. Judging from the melting point of gold, although it is not the highest, it is 1068℃, while the temperature of general flame is about 800℃. Because the temperature of the flame is lower than the melting point of gold, gold cannot be melted. 17. With a long whistle, people in the valley should give a long whistle. After many reflections, the sound can form a loud echo, which lasts for a long time. As if the mountains were shouting and the valleys were echoing.
18. Looking at the sky from the well, you can see very little. Because light travels along a straight line, from the knowledge of geometric drawing, the frog's field of vision will be very small. 19. It can be seen from the pressure formula that when the pressure is constant, the smaller the stress area, the greater the pressure.
People will feel very uncomfortable sitting on such a blanket. 20. Good years are bright. Because snow is a bad conductor of heat, when it covers crops, it can well prevent heat conduction and air convection, so it can play a role in heat preservation.
2 1. It is cold before frost and cold after snow. In the late autumn night, the temperature near the ground suddenly turns cold (the temperature is below 0℃), and the water vapor in the air condenses into small ice crystals and adheres to the ground to form frost, so it feels "cold before frost". When snow melts, it needs to absorb heat to reduce the temperature of the air, so we have the feeling of "cold after snow".
22. Eggs touch stones-overreached eggs touch stones. Although the force is the same, the pressure that each object can bear is certain. If this limit is exceeded, the object may be damaged. Eggs can withstand less pressure, so they will break.
23. Before the jade is polished, the surface is uneven and the light is diffuse. After the jade is polished, the surface is smooth and the light is mirrored. 24. The fan is cool and suitable for summer.
3. How to drink water is the most scientific
What kind of water do you drink? Fresh boiled water is the best choice.
Boiling water is boiled from natural water after multi-layer purification. Microorganisms in water have been killed by high temperature, and calcium and magnesium in boiling water are very beneficial to health. Studies have shown that hard water containing elements such as calcium and magnesium can prevent cardiovascular diseases. 2) What is the optimum temperature? Some people like to drink ice water in the refrigerator after getting up in the morning, which is the most refreshing.
In fact, it is not advisable to drink such water in the morning, because the gastrointestinal tract has been emptied at this time, and water that is too cold or too hot will reach the gastrointestinal tract, causing gastrointestinal discomfort. Drink water in the morning, preferably boiled water at the same temperature as room temperature, and warm water when it is cold, so as to minimize the irritation to the gastrointestinal tract.
It is found that boiled water cooled to 20-25℃ has specific biological activity, which can easily penetrate cell membrane, promote metabolism and enhance human immune function. People who are used to drinking warm and cold boiled water have higher deoxyenzyme activity in their bodies, good metabolism, less accumulation of lactic acid in muscle tissues and are not easy to feel tired.
Be sure to cover the boiled water when it is aired the night before, because the boiled water will lose its activity if it is exposed to the air for too long. 3) How much water do you drink? A healthy person should drink at least 7-8 glasses of water (about 2.5 liters) every day. When the exercise is heavy or the weather is hot, the water consumption will increase accordingly.
Getting up in the morning is the key moment for the body to replenish water in the new day. At this time, it is best to drink 300 ml of water. 4) How to drink water? Drinking water in the morning must be on an empty stomach, that is, drinking water before breakfast, otherwise it will not achieve the effect of promoting blood circulation and gastric lavage.
It is best to drink water in small sips, because drinking water too fast is very harmful to the body, which may cause blood pressure reduction and brain edema, leading to headache, nausea and vomiting. But I also tell you that drinking water often before going to bed is easy to relax your face.
4.50 Scientific knowledge in life
1. When taking medicine, don't use tea to deliver medicine, because tea will neutralize the medicine and reduce its medicinal properties.
2。 It is harmful to drink tea when you have a fever, because theophylline contained in tea will raise the temperature of human body, affect and reduce the effect of drugs, thus aggravating the condition. Therefore, it is not advisable to drink tea when you have a fever.
3。 Wearing red clothes can absorb and filter out more ultraviolet rays from the sun, thus reducing the harm of ultraviolet rays to the skin.
4。 Children should not eat sugar on an empty stomach, because it will affect normal metabolic function.
Putting fresh eggs in limewater can keep them fresh, because the carbon dioxide exhaled by eggs reacts with limewater to generate calcium carbonate, which blocks the micropores on the surface of eggs and prevents oxidation and deterioration. 6。
In order to prevent food from being affected with moisture, deterioration or deformation, food bags are often filled with gas carbon dioxide or nitrogen; Or put desiccant in the bag: quicklime and calcium chloride mainly absorb water, and iron mainly absorbs oxygen and water; Or vacuum package. 7。
The gases in the swim bladder are carbon dioxide and oxygen. It's important to add some soda when making steamed bread. In order to neutralize the acid produced during flour fermentation, the carbon dioxide produced can make bread loose and porous.
9。 The residual pesticides in vegetables can be soaked in alkaline substances, which can reduce the medicinal properties of pesticides 10.
1 1 Adding vinegar can remove the astringency of preserved eggs. The odor of refrigerator can be removed by activated carbon, that is, the adsorption of activated carbon is used.
12。 The scale on the aluminum pot (mainly calcium carbonate and magnesium hydroxide) can be removed with hydrochloric acid or vinegar, and the quartz clock hanging on the wall can also be removed. When the battery is exhausted and stops moving, its second hand often stops at the position of "9" on the dial.
This is because the second hand is most hindered by the large torque at the "9" position. 2. Sometimes, when tap water flows from the adjacent faucet, it occasionally makes bursts of noise.
This is because the water pipe vibrates when the water rushes out of the tap. 3. When shooting TV pictures, turn off the camera flash and indoor lighting, so that the pictures taken are clearer. Because the reflected light of flashlight and floodlight on TV screen will interfere with the transmitted light of TV picture. At the same temperature, frozen meat thaws faster in water than in air.
At the same temperature, hot nails cool faster in water than in air. A cup filled with boiling water cools faster when immersed in water than when immersed in air at the same temperature.
All these phenomena show that water has better heat transfer than air. When there is cold water in the pot, the water droplets attached to the outer surface of the pot bottom can only dry on the flame for a long time, and then they will boil. This is because the water droplets, the pot and the water in the pot keep heat conduction, and the temperature is similar. As long as the water in the pot is not boiled, the water droplets will not boil, but will evaporate on the flame and gradually dry up. 6. Deformed mirrors. The farther the deformed mirror is from the mirror, the more the reflected light on the silver-plated surface deviates from the normal position according to the principle of light amplification, and the more deformed the mirror is. 7. There are several small holes on the side of the gas nozzle of the natural gas furnace, but natural gas will not be ejected from the small holes on the side, but only from the nozzle. This is because the air velocity at the nozzle is high, and according to the principle of fluid mechanics, the air surface pressure is lower than the atmospheric pressure outside the hole.
8. After blowing the balloon, hold the mouthpiece with your hand and then suddenly release it. The air in the balloon is ejected and the balloon moves due to recoil. You can see that the route of balloon movement is tortuous.
There are two reasons: first, the thickness and tension of the inflated balloon are uneven everywhere, which makes the balloon contract unevenly and swing around when it is deflated, thus the movement direction changes constantly; Second, the shape of the balloon is constantly changing during the contraction, so the air velocity on the surface of the balloon is also constantly changing during the movement. According to the principle of fluid mechanics, the air pressure on the surface of the balloon is constantly changing, so the balloon swings and the direction of movement is also constantly changing. 9. When the ceiling fan rotates normally, the tension at the suspension point is smaller than when it does not rotate. The greater the rotational speed, the more the tension decreases. This is because when the ceiling fan rotates, the air has an upward reaction to the ceiling fan blades. The greater the speed, the greater the reaction force. The "combustion" of electric furnace is the conversion of electric energy into internal energy without oxygen. Oxygen can only oxidize wires and shorten their service life.
1 1. Even if there is no wind, the path of paper dropping is tortuous. This is because each part of the paper has different convexity and concavity and shape, so in the process of falling, the air speed on its surface is different. According to the principle of fluid mechanics, there is uneven air force everywhere on the paper, which changes with the movement of the paper, so the paper keeps rolling and falling zigzag.
5. What is the common sense about science in life?
Hello! There is really a lot of common sense in life. I am a woman who pays attention to life. But for busy people like us, although we know a lot of common sense, it is difficult to do it. I can simply tell you some common sense of life that is easy to do:
1, set the alarm clock five minutes in advance, open your eyes, turn your eyes left and right, up and down regularly and orderly, and pat yourself on the head with a smile. This has a refreshing effect. The mood of the day is much better.
2, drink a cup of boiled water on an empty stomach (300 to 500 ml): simply put on clothes, go to a place to burn some boiled water for yourself, and then come back to dress (save time), 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 time to tidy up the housework, and finally have breakfast for almost 30 minutes.
4, eat breakfast, pack up for work, it is best not to do strenuous exercise immediately. /kloc-Drink 200ml water around 0: 00 (fruit is preferred) and 300-500ml boiled water 30 minutes before meals.
5, lunch, drink soup before meals slim and healthy, do not drink soup during or after meals.
6. Don't walk quickly within 30 minutes after a meal, but keep standing. It is best to take a walk for 30 minutes an hour after dinner.
7. Dinner should be similar to lunch, but lighter. It is best not to eat big meals after 6 pm, which is bad for the stomach and kidneys.
8. Pay attention to whether it is better to drink milk or yogurt, followed by pure milk. Don't trust any fruit with milk. There is basically no nutrition when mixed together, but drinks are not drinks. Drinking it also hurts the stomach. I study dairy nutrition and know a little about life nutrition.
9. I wish you a healthy lifestyle and good health.
6. How to drink water is the most scientific
The human body consumes 2 liters to 3 liters of water every day, and people can't live without water, so it is necessary to replenish these consumed water in time, otherwise it will affect blood operation and digestion.
Therefore, everyone should keep drinking two liters or eight glasses of water every day and drink enough water in summer or during excessive exercise. When drinking water, you should also pay attention to what water you can drink and what you can't drink. For example, you should never drink the water left after cooking or cooking. The stale boiled water, boiled water repeatedly and boiled warm water for a long time are harmful to human body.
If you can't keep enough water, you can also contact water frequently, let the water discharge harmful substances that are free from the body, take a bath frequently and soak your feet more.
7. Scientific common sense
Water is a physiological factor for all life processes to proceed normally. Living things can't live without water, but how much water can people drink a day to ensure their health? What is the best time to drink?
In this regard, tatyana ulyan Nova, a physician at the Clinical Hospital of the Russian Ministry of Health in Arkhangelsk, has his own opinions.
The human body needs a proper amount of water.
The human body is about 70% water, and the correct drinking method is of great significance to health. Lack of water will affect all organs, make them lack of nutrition, the kidneys will gradually become overwhelmed and the working conditions will be worse than before. As a result, harmful substances will accumulate in the body and people will become exhausted. However, many people blame these symptoms on lack of sleep and stress response. In addition, dehydration will also be reflected in the appearance: dull nails, soft hair, chapped skin and so on. It is the result of not paying attention to drinking water.
However, some people mistakenly believe that the more water you drink, the better, so that more harmful substances and residues can be excreted. In fact, in addition to residues, there will be a lot of nutrients and trace elements excreted with water.
How much water does a person drink a day? The calculation formula is as follows: 35 ~ 40ml of water should be added to each kilogram of adult's body weight. In other words, people weighing 50 kg should be supplemented with 1750~2000 ml of water. This figure also includes water obtained from foods such as soup, fruits and vegetables.
Of course, the water demand will increase in hot days and decrease in cold days. However, in the winter heating season, because of the dry climate, you should drink more water, so you should pay attention to replenish water in time in cold days to maintain the balance of water, not to mention that the body needs to heat and moisturize the inhaled cold air. Women who are breastfeeding their children need to drink plenty of water, and pay attention to replenish water after eating, especially those with high fever.
The temperature of drinking water is particular.
Doctors recommend drinking warm water, the best water temperature 18~45 degrees Celsius. Overheated water will not only damage enamel, but also strongly damage the mucosa of throat, digestive tract and stomach. Drinking hot water for a long time will lead to changes in various organs. For example, the stomach wall of people who like to drink hot tea above 62 degrees Celsius becomes fragile, so drinking water in cold weather should not exceed 50 degrees Celsius.
Of course, many people like Liang Yu drinks. They think that when drinking cold drinks, the body consumes a lot of energy to heat, so it consumes excess calories. Some people think that cold drinks or cold water can quench their thirst better.
Actually, it's not exactly like this. It was discovered a long time ago that the more cold water you drink, the less you can quench your thirst. If you drink water with a temperature close to body temperature, it will not only help you absorb it, but also quench your thirst faster.
Moreover, after drinking cold drinks, the body temperature will suddenly change, which will cause vocal cord spasm, cause voice loss for a period of time, and also induce various inflammations in the body, from the common cold to pneumonia.
In addition, drinking iced cocktails can cause gastrointestinal discomfort, especially for people with stomach problems and people with sensitive stomachs. People with rheumatism, gout and bladder diseases should not drink cold water. Sudden temperature drop will only aggravate the condition.
It is best to drink water before or after meals.
Generally speaking, doctors will never recommend drinking water immediately after meals. Drinking liquid will either wash away all enzymes or reduce their function. Fat people should not drink tea immediately after eating, because the food diluted by liquid will leave the stomach soon, and as a result, they will feel hungry just after eating.
In addition, frequent drinking a lot of water after meals is also easy to cause heartburn, so people with heartburn are suitable to drink water 2-3 hours after meals and drink 3-4 sips every 20-30 minutes.
Don't drink water for ordinary meals, and you can only drink a little if you want, but don't drink water for a while afterwards. Wait half an hour after using fruits and vegetables, 1~2 hours after using starchy foods, and 1.5~2 hours after using high-protein foods.
Drinks such as drinking water and fruit juice should be drunk before meals 15~40 minutes, because the liquid enters the small intestine after 10 minutes of appetizing, and is absorbed into the blood immediately after arriving there.