Scientific knowledge

Phenomena 1: Liquid evaporates.

Fix the thermometer on the crossbar of the iron bracket and observe the reading of the thermometer (ie, the room temperature value). Wrap two layers of dry gauze around the temperature-sensing bulb of the thermometer (paste it slightly with paper tape), and use a fan to fan it. You can see that the liquid column does not move.

Immerse the thermometer's temperature-sensitive bulb together with the gauze in alcohol, and you can still see that the thermometer's reading remains unchanged (the alcohol temperature is the same as room temperature).

When the alcohol bottle is removed, the thermometer reading will drop significantly as the alcohol on the gauze evaporates. At this moment, if you fan yourself against the temperature-sensing bubble of the thermometer, the reading of the thermometer will drop faster.

The above comparison demonstration shows that heat must be absorbed when liquid evaporates; fanning cannot reduce the temperature of an object, but can only speed up the evaporation of liquid.

Phenomena 2: "Heat quickly".

"Heat quickly" usually uses a thin metal tube to be wound into a heating coil. An electric heating wire is installed in the tube, and insulating materials such as magnesium oxide powder are poured into it to turn the heating wire into a heating coil. The package is fixed in the middle of the tube so that it does not come into contact with the tube wall. Both ends of the heating wire are connected to the power cord respectively. After energization, current flows through the heating wire, and the heating wire generates heat.

If the "heat fast" is immersed in a liquid, the heat will be quickly dissipated through the liquid, so that the liquid will be heated quickly without burning out the heating wire. If "Hot Fast" is allowed to dry-burn in the air, the heat will not be easily dissipated, and the metal outer tube will quickly burn or even burn red, and the electric heating wire inside the tube will burn out.

Because the electric heating wire in "Heat Fast" is made of nickel-iron alloy filament, it is generally brittle and easy to break. "Hot Fast" should not be vibrated violently. If there is scale or attachment on the surface, gently brush it off with a small brush. Do not hit it with a hard object or scrape it with a knife. "Heat Fast" is a commonly used electric heater in daily life. It can be used to boil water, heat milk, make coffee, etc., quickly and conveniently.

Phenomena 1: The aroma of food.

If we cook in the kitchen, people outside the house can also smell the aroma of the food. Sometimes the oil in the pot is just hot, and people outside the kitchen can smell the oil. How is the fragrance smelled? During the cooking process, part of the molecules of the food are evaporated into the air and gradually move in all directions. When they penetrate our nostrils, we smell the aroma. This process is called diffusion phenomenon. It is the diffusion of gases that helps people smell various smells.

Diffusion occurs not only in gases, but also in liquids. When making soup, add a few drops of soy sauce. Even if you don't stir it, the entire soup will be gradually and evenly dyed with the color of soy sauce and rich in the delicious taste of soy sauce. This is the result of the soy sauce spreading in the soup.

Diffusion also occurs between solids. Someone once did such an experiment: polish a piece of lead and a piece of gold respectively, press them together, and leave them at room temperature (20°C) for five years. The gold and lead will be connected together, and they will mix with each other. The depth is about one centimeter. We know that gold and lead will not melt at room temperature, but their contact surface actually produces a uniform layer of lead-gold alloy. This is the trick that diffusion plays in solids.

The phenomenon of diffusion vividly proves that no matter what form of matter they are, their molecules are in motion all the time. When they come into contact with each other, they will diffuse into each other. As the temperature increases, the speed of random movement of molecules increases and diffusion also accelerates.

Phenomena 2: Expanded popcorn.

"Bang!" With a loud noise, the aroma of popcorn wafted away. Popcorn is large, round, crispy and fragrant, and is a very popular puffed food. As soon as the rice is processed by the popcorn machine, its volume suddenly expands many times. No wonder people humorously call the popcorn machine a "grain expander"! So, how do rice grains get enlarged?

We know that gases sealed in containers have a special temperament: as the temperature increases, the pressure increases. When the popcorn machine is heated, the pressure of the air sealed in the can gradually increases; at the same time, the rice inside is gradually heated, and the moisture stored in the rice gradually evaporates and accumulates in the iron can. The temperature of the tank continues to rise, and the air pressure inside the tank becomes larger and larger. This high pressure prevents the water in the rice from continuing to evaporate, causing the remaining water in the rice to gradually heat up and increase the pressure. Each rice grain is like a small balloon that has been filled with air. , only because they are restricted by the air pressure inside the tank, they cannot explode.

When the air pressure in the tank rises to 2-3 atmospheres (this can be seen from the barometer), the heating will stop. At this time, the popcorn maker put a long cloth bag on the mouth of the popcorn machine, and then opened the lid. It was too late, but soon, with a loud noise, the rice sprayed into the bag. The high-temperature and high-pressure rice grains suddenly enter an environment with lower air pressure. The high-temperature and high-pressure moisture held in the rice grains loses its binding force and expands rapidly, causing the rice grains to swell rapidly and turn into popcorn.

Through popcorn, we can see the huge power of "high temperature and high pressure". Festival fireworks and firecrackers, blasting on construction sites, steam hammers in factories, Hercules steam locomotives...their colorful performances are all directed by "high temperature and high pressure". With the development of science and technology, it has become a powerful driving force in production.

Phenomena 1: Ground discharge.

The earth is a good conductor. Because it is extremely large, it can accept a large amount of electric charges without significantly changing the electric potential of the earth. This is just like pumping water from the ocean or releasing water into the ocean, which does not significantly change the electric potential of the ocean. The height of the plane is the same. If a charged conductor is connected to the earth by a wire, charge will flow from the charged body to the earth until the conductor is so uncharged that it can be considered no longer charged. In production and real life, it is often necessary to avoid the accumulation of charges. At this time, grounding is an effective measure.

Phenomena 2: Tip discharge.

Normally, air is non-conductive, but if the electric field is particularly strong, the positive and negative charges in the air molecules are subject to strong electric field forces in opposite directions and may be "teared" apart. This phenomenon is called air ionization. Because the ionized air has charges that can move freely, the air can conduct electricity. The negative charges generated after ionization of air are electrons, and the atoms that have lost electrons are positively charged and are called positive ions.

Since the same kind of charges repel each other, the static charges on the conductor are always distributed on the surface, and generally speaking, the distribution is uneven. The charge at the tip of the conductor is particularly dense, so the electric field in the air near the tip It is particularly strong, causing the small amount of ions remaining in the air to accelerate. These high-speed ions hit air molecules, ionizing more molecules. At this time, the air becomes a conductor, resulting in tip discharge.

Phenomena? B

Answer: chenkooooooo - Juren Level 4 11-24 21:30

The warm foam in the snow bites the non-permanent insulator of the metal magnet. The effect of milk on light through electric current

In fact, many physics are closely related to life, and all of them are somewhat related.

I just don’t know where you want to hit

You If you think which one is the same as what you imagined, just search online and you will find all the answers.

Answer: Wei Yi - Tong Sheng Level 1 11-24 21:32

Why Does warm water freeze faster than cold water?

Now, the most common theory among many explanations is: temperature difference theory, that is, warm water freezes faster than cold water in winter because the temperature difference between warm water and the surrounding environment is greater than the temperature difference between cold water and the surrounding environment. , the energy of water molecules in warm water with large temperature differences will be quickly dissipated to the surrounding environment. Of course, this theory is still questioned by many scientists. Because according to this theory, the temperature difference between cold water and the surrounding environment is small, and cold water molecules lose energy slowly, the problem is that warm water will eventually turn into cold water, and the crystallization speed after it turns into cold water should be the same as the direct freezing of cold water. Therefore, considering the time it takes to cool warm water to cold water, it should be concluded that cold water should freeze faster than warm water anyway. It seems that this "temperature difference theory" is not worthy of scrutiny. According to the report, then, why does warm water freeze faster than cold water? There must be another mechanism in the freezing process of warm water that has not been recognized yet. Perhaps in the near future, scientists will unravel this mystery hidden around us.

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It often happens that the windows in the room are closed very tightly without any leaks, but it still feels windy. This seems strange. But in fact there is nothing surprising.

The air in the room is rarely completely stable. There is always some invisible air flow in the room, which is caused by the heating or cooling of the air.

When the air is heated, it becomes thinner and therefore lighter; when it is cooled, on the contrary, it becomes denser and therefore heavier. The lighter warm air heated by lamps or stoves pushes the cold air upward to the ceiling, while the heavier cold air near cold windows or walls sinks downward to the floor. .

Regarding the air flow in the room, we can use the balloons that children play to observe. Tie a small object under a balloon so that the balloon does not fly all the way to the ceiling, but only Floating in the air, so if you place this balloon next to a roaring stove, it will be driven by invisible air currents and slowly travel around the room. First it rose from beside the stove to under the ceiling, then floated to the side of the window, dropped to the floor from there, returned to the stove, and circled around the room again.

Although the windows are closed very tightly in winter, it is impossible for the cold air from outside the room to penetrate inside, but we still feel the wind blowing, especially under our feet. This is the reason.

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Why do high jumpers take a run-up?

High jumpers can rise over the crossbar by relying on the inertial force of the run-up and the force of the take-off and kicking action. Support reaction force. Since the direction of the inertial force is horizontally forward, and the support reaction force is vertical (or nearly vertical) upward, the center of gravity of the body moves along a parabolic trajectory after taking off. The height of this parabolic trajectory depends on the initial speed and take-off angle when jumping. In other words, the initial speed and take-off angle are the keys to increasing the height of the high jump. Generally speaking, these two values ??should be increased as much as possible. The maximum lift angle is 90 degrees. However, since the high jump is not a simple vertical upward movement, there must be a forward force when crossing the crossbar; moreover, the horizontal speed must be fully utilized to increase the initial speed of the jump, so the take-off angle should be less than 90 degrees. As for the initial speed of soaring, it is closely related to the athlete's quality and technical proficiency. The greater the initial speed, the higher the jump. When the take-off angle is constant, the initial take-off speed plays a decisive role.

Why can you "drink" soda with a straw?

This is a common phenomenon in life. Before the mouth inhales air from the tube, the liquid levels inside and outside the tube are equal. At this time, the gas pressure on the liquid surface inside and outside the tube is equal; when the mouth inhales from the tube, the gas in the tube decreases, and the pressure on the liquid surface in the tube also decreases. At this time, the gas pressure on the liquid surface in the tube is smaller than the liquid acting outside the tube. atmospheric pressure on the surface. Therefore, we say that the cause of this phenomenon is the result of atmospheric pressure. When drinking soda, you must first insert the tube into the soda. When you inhale through your mouth, part of the gas in the tube will be sucked into your mouth, causing the volume of the remaining gas in the tube to become larger and the pressure to become smaller, which is less than the atmospheric pressure outside the tube. Therefore, under the action of atmospheric pressure outside the tube, the soda rises along the tube and is sucked into the mouth.

Why can a thermos bottle keep heat?

There are three ways of heat transfer: heat convection, heat conduction, and heat radiation. Thermal convection mainly occurs between liquids and gases. The hot flow rises and the cold flow falls. Dynamic balance is achieved through continuous circulation. Heat conduction occurs on the hot conductor. Heat is conducted from the high-temperature end to the low-temperature end, and heat radiation does not occur. A medium is required, which transfers heat to low temperatures through radiation. There is air between the bladder and the shell of the thermos bottle. Air is a poor conductor of heat, so the heat conduction is greatly reduced. The inside of the bladder is as smooth as a mirror, which reduces radiation, so the thermos bottle can keep heat.

Is it easier to peel cooked eggs by soaking them in cold water?

To understand this problem, we must first know what role water plays in this process? Among the substances we encounter, except for a few types, most have "thermal expansion and contraction" "Such a physical property. However, the degree of expansion and contraction of various substances is different. Eggs are composed of hard eggshells and soft egg whites and yolks, and their expansion and contraction conditions are also different. When the temperature changes little or evenly, nothing will appear. But when the temperature changes drastically, the steps of the egg white and the eggshell are inconsistent. When the boiled hot egg is suddenly immersed in cold water, the cold water will Its temperature changes greatly. The eggshell shrank suddenly.

The egg white is still at the original temperature and has not shrunk in volume. At this time, a part of the egg white is squeezed into the short end of the egg by the egg shell. Subsequently, the egg white gradually shrinks due to the gradual decrease in temperature. Due to the shrinkage of the egg white, egg shell and egg yolk, Different, this forms the separation of egg white and egg yolk. Therefore, when you peel it, the eggshell and meat will not come off together.

The special feeling on the elevator

"Overweight" and "weightlessness" are two physical phenomena. Everything on the earth is affected by gravity. If a force causes an object to accelerate upward against gravity, it will become overweight. If an object accelerates downward along gravity, it will experience weightlessness.

Was the person who got an electric shock "sucked" by the electricity?

People often hear this saying: When a person gets an electric shock, he is sucked by the electricity and cannot pull away.

In fact, this statement is wrong. We know that regardless of whether there is current or not, in general, the positive and negative charges in positive wires and electrical appliances are equal, and the external electrostatic effects cancel each other out. Even if a small amount of positive and negative charges occasionally appear locally but are not equal, the electrostatic attraction will be negligible. But the question arises, why don't people sometimes pull their hands back when they get an electric shock? Don't you want to take it back? It was obviously sucked and couldn't be pulled back. This question can be explained by the physiological effects of electric current.

When a human hand is electrocuted, the hand will go from spasm to paralysis due to the stimulation of the current. Even if the command to withdraw the hand is issued, the hand cannot carry out the command. Surveys have shown that the vast majority of people who die from electrocution are electrocuted on the palm of the hand or on the same side of the fingers and palm. When I first got an electric shock, my hand bent due to conditioned reflex, and the bending direction made my hand unconsciously hold the wire. In this way, the time of electric shock is prolonged, and the hand will quickly spasm and become paralyzed. At this time, even if you think of letting go of your fingers and withdrawing your arm, it is no longer possible, and it seems to be "sucked". If the electric shock lasts longer, the person's central nervous system will be paralyzed, and they will no longer be able to withdraw their hands. These processes all occur within a relatively short period of time.

If you get an electric shock on the back of your hand, it will not easily lead to death for ordinary civilian electricity. In order to judge whether the electrical appliances are leaking and do not have an electric test pen at hand, experienced electricians sometimes use the nail side of their index finger to lightly touch the electric shock. Touch the electrical enclosure. If there is a leakage, the index finger will bend due to the opposite conditions, and the direction of bending is exactly the direction away from the electrical appliance. In this way, the electric shock time is very short and there is no danger. Of course, the voltage is very high and this can be dangerous.

Family energy-saving tips

Lighting energy-saving fluorescent lamps have the characteristics of high luminous efficiency, soft light, long life and low power consumption. The brightness of a 14-watt energy-saving fluorescent lamp is equivalent to The brightness of a 75-watt incandescent lamp, so using fluorescent lamps instead of incandescent lamps can greatly reduce power consumption. Low-power fluorescent lamps can be installed in corridors and bathrooms. When watching TV, only turn on a 1-watt energy-saving fluorescent lamp, which not only saves electricity but also provides ideal viewing effects. It is also necessary to ensure that the lights are extinguished when people leave, and the "eternal lights" are eliminated.

TV saves power. The brightest state of a TV consumes 50 to 60% more power than the darkest state; the higher the volume, the greater the power consumption. Therefore, when watching TV, the brightness and volume should be adjusted to the state where people feel the best, not too bright, and not too loud. This not only saves energy, but also helps extend the life of the TV. Some TV sets will preheat the picture tube as long as the power plug is plugged in, consuming 6 to 8 watts of power. Therefore, after turning off the TV, unplug it from the power socket.

Refrigerator saves energy. The refrigerator should be placed in a cool and ventilated place and never close to a heat source to ensure that the heat sink can dissipate heat well. When in use, try to minimize the number and time of opening the door. Do not overstuff the refrigerator with food, and leave gaps between foods to allow for air convection. Frozen food to be eaten should be slowly melted in the refrigerator in advance. This can lower the temperature of the refrigerator and save electricity consumption.

Washing machine power saving The power consumption of the washing machine depends on the rated power of the motor and the length of use. The power of the motor is fixed, so reducing the washing time appropriately can save electricity. The length of washing time depends on the type of clothing and the degree of soiling. Generally, the time for washing delicate clothes such as silk can be shorter, and the time for washing thick fabrics such as cotton and linen can be slightly longer. If you use a washing machine to rinse, you can first wring out the soapy water or laundry detergent foam on the clothes before rinsing. This can not only save electricity, but also reduce the number of rinses and achieve the purpose of saving electricity.

Electric fans save energy. Generally, electric fans with larger blades have greater electrical power and consume more electrical energy. The power consumption difference between the fastest gear and the slowest gear of the same electric fan is about 40%. One hour of power consumption on the fast gear can be nearly 2 hours of use on the slow gear. Therefore, slow speed is commonly used to reduce the power consumption of electric fans.

Phenomena 1: Liquid evaporates.

Fix the thermometer on the crossbar of the iron bracket and observe the reading of the thermometer (ie, the room temperature value). Wrap two layers of dry gauze around the temperature-sensing bulb of the thermometer (paste it slightly with paper tape), and use a fan to fan it. You can see that the liquid column does not move.

Immerse the thermometer's temperature-sensitive bulb together with the gauze in alcohol, and you can still see that the thermometer's reading remains unchanged (the alcohol temperature is the same as room temperature).

When the alcohol bottle is removed, the thermometer reading will drop significantly as the alcohol on the gauze evaporates. At this moment, if you fan yourself against the temperature-sensing bubble of the thermometer, the reading of the thermometer will drop faster.

The above comparison demonstration shows that heat must be absorbed when liquid evaporates; fanning cannot reduce the temperature of an object, but can only speed up the evaporation of liquid.

Phenomena 2: "Heat quickly".

"Heat quickly" usually uses a thin metal tube to be wound into a heating coil. An electric heating wire is installed in the tube, and insulating materials such as magnesium oxide powder are poured into it to turn the heating wire into a heating coil. The package is fixed in the middle of the tube so that it does not come into contact with the tube wall. Both ends of the heating wire are connected to the power cord respectively. After energization, current flows through the heating wire, and the heating wire generates heat.

If the "heat fast" is immersed in a liquid, the heat will be quickly dissipated through the liquid, so that the liquid will be heated quickly without burning out the heating wire. If "Hot Fast" is allowed to dry-burn in the air, the heat will not be easily dissipated, and the metal outer tube will quickly burn or even burn red, and the electric heating wire inside the tube will burn out.

Because the electric heating wire in "Heat Fast" is made of nickel-iron alloy filament, it is generally brittle and easy to break. "Hot Fast" should not be vibrated violently. If there is scale or attachment on the surface, gently brush it off with a small brush. Do not hit it with a hard object or scrape it with a knife. "Heat Fast" is an electric heater commonly used in daily life. It can be used to boil water, heat milk, make coffee, etc., quickly and conveniently.

Phenomena 1: The aroma of food.

If we cook in the kitchen, people outside the house can also smell the aroma of the food. Sometimes the oil in the pot is just hot, and people outside the kitchen can smell the aroma of the oil. How is the fragrance smelled? During the cooking process, part of the molecules of the food are evaporated into the air and gradually move in all directions. When they penetrate our nostrils, we smell the aroma. This process is called diffusion phenomenon. It is the diffusion of gases that helps people smell various smells.

Diffusion occurs not only in gases, but also in liquids. When making soup, add a few drops of soy sauce. Even without stirring, the entire soup will gradually and evenly become dyed with the color of soy sauce and be rich in the delicious taste of soy sauce. This is the result of the soy sauce spreading in the soup.

Diffusion also occurs between solids. Someone once did such an experiment: polish a piece of lead and a piece of gold respectively, press them together, and leave them at room temperature (20°C) for five years. The gold and lead will be connected together, and they will mix with each other. The depth is about one centimeter. We know that gold and lead will not melt at room temperature, but their contact surface actually produces a uniform layer of lead-gold alloy. This is the trick that diffusion plays in solids.

The phenomenon of diffusion vividly proves that no matter what form of matter they are, their molecules are in motion all the time. When they come into contact with each other, they will diffuse into each other. As the temperature increases, the speed of random movement of molecules increases and diffusion also accelerates.

Phenomena 2: Expanded popcorn.

"Bang!" With a loud noise, the aroma of popcorn wafted away. Popcorn is large, round, crispy and fragrant, and is a very popular puffed food. As soon as the rice is processed by the popcorn machine, its volume suddenly expands many times. No wonder people humorously call the popcorn machine a "grain expander"! So, how do rice grains get enlarged?

We know that gases sealed in containers have a special temperament: as the temperature increases, the pressure increases.

When the popcorn machine is heated, the pressure of the air sealed in the can gradually increases; at the same time, the rice inside is gradually heated, and the moisture stored in the rice gradually evaporates and accumulates in the iron can. The temperature of the tank continues to rise, and the air pressure inside the tank becomes larger and larger. This high pressure prevents the water in the rice from continuing to evaporate, causing the remaining water in the rice to gradually heat up and increase pressure. Each rice grain is like a small balloon that has been filled with air. , only because they are restricted by the air pressure inside the tank, they cannot explode. When the air pressure in the tank rises to 2-3 atmospheres (this can be seen from the barometer), the heating will stop. At this time, the popcorn maker put a long cloth bag on the mouth of the popcorn machine, and then opened the lid. It was too late, but soon, with a loud noise, the rice sprayed into the bag. The high-temperature and high-pressure rice grains suddenly enter an environment with lower air pressure. The high-temperature and high-pressure moisture held in the rice grains loses its binding force and expands rapidly, causing the rice grains to swell rapidly and turn into popcorn.

Through popcorn, we can see the huge power of "high temperature and high pressure". Festival fireworks and firecrackers, blasting on construction sites, steam hammers in factories, Hercules steam locomotives...their colorful performances are all directed by "high temperature and high pressure". With the development of science and technology, it has become a powerful driving force in production.

Phenomena 1: Ground discharge.

The earth is a good conductor. Because it is very large, it can accept a large amount of electric charge without significantly changing the electric potential of the earth. This is just like pumping water from the ocean or releasing water into the ocean without significantly changing the electric potential of the ocean. The height of the plane is the same. If a charged conductor is connected to the earth by a wire, charge will flow from the charged body to the earth until the conductor is so uncharged that it can be considered no longer charged. In production and real life, it is often necessary to avoid the accumulation of charges. At this time, grounding is an effective measure.

Phenomena 2: Tip discharge.

Normally, air is non-conductive, but if the electric field is particularly strong, the positive and negative charges in the air molecules are subject to strong electric field forces in opposite directions, and may be "torn" apart. This phenomenon is called air molecules. ionization. Because the ionized air has charges that can move freely, the air can conduct electricity. The negative charges generated after ionization of air are electrons, and the atoms that have lost electrons are positively charged and are called positive ions.

Since the same kind of charges repel each other, the static charges on the conductor are always distributed on the surface, and generally speaking, the distribution is uneven. The charge at the tip of the conductor is particularly dense, so the electric field in the air near the tip It is particularly strong, causing the small amount of ions remaining in the air to accelerate. These high-speed ions hit air molecules, ionizing more molecules. At this time, the air becomes a conductor, resulting in tip discharge.

Phenomena 3: Spark discharge.

When a high-voltage charged body and a conductor are very close, the strong electric field will instantly ionize the air between them, and the charges will form an electric current through the ionized air. Because the current is particularly large, a large amount of heat is generated, causing the air to sound and glow, producing electric sparks. This discharge phenomenon is called spark discharge.

Spark discharge is often encountered in life. In dry winter, when you wear sweaters and chemical fiber clothes and walk for a long time, static charges will accumulate on your body due to friction. At this time, if your fingers are close to metal objects, you will feel a needle-like pain on your hands. This is sparks. Caused by electrical discharge, if you take a key beforehand and keep the tip of the key close to other metal objects, you will avoid pain. Try it in a dark place. When the tip of the key is close to the metal body, you will not only hear a sound, but also see sparks. In some factories or laboratories, where there is a large amount of flammable gas, workers have to wear special shoes. These shoes have very good electrical conductivity and can conduct electric charges into the earth to avoid the accumulation of electric charges on the human body and the generation of sparks. Discharge, causing fire.

Answer: Zhengyan - Jianghu Rookie Level 5 11-24 21:33

The strongest "stop hiccup method"

This is a traditional Chinese medicine acupuncture point - ---Laogong Point

Most people have to wait a long time for hiccups to disappear, which is very painful. Now we provide a method to stop hiccups quickly

Reference.

This method is an ancient guidance technique. It is very simple. It is to use the thumb of one hand to press hard

The center of the palm of the other hand (i.e. Laogong point).

(It doesn’t matter whether you are left or right hand, use the thumb of one hand to press hard on the center of the palm of the other hand.

Hiccup after pressing it for many times It will stop)

According to the book, the hiccups will stop within 3 minutes, but in my experience, the hiccups will automatically stop after 10 seconds.

It is quite magical.

Rub your ears - make your brain more flexible

The air in the office is a kind of stagnant ion freezing, even if the air conditioning system is running, human beings

My head still can't help but want to take a nap, and I may even have habitual migraines or sudden irritability, making it difficult to make some clear decisions.

Once I mentioned this symptom to my mother who is good at qigong meditation. Without saying a word, she grabbed my two ears and started rubbing them. The dean of discipline was caught and punished as a prank

Unexpectedly, after the ears were heated and rubbed, the head actually fused and balanced, as if there was

an invisible elf on the head The people around me were sweeping away the dust with a broom. Miraculously, I felt an indescribable feeling of comfort.

Later, my mother told me the principle. Human ears are covered with large and small acupuncture points. After proper stimulation,

the tense brain can be quickly relieved. Get relief.

No more blabbering, give it a try as soon as you see this! The harder you work, the brighter your brain becomes!

Recommendation: When sitting in the office, usually do it once every 2 hours, 1-2 minutes each time.

Eat riper bananas

According to research by Japanese scientists, bananas contain TNF, an anti-cancer substance, and the more ripe the bananas, the better. The higher the anti-cancer effect.

Professor Masatoshi Yamazaki of the University of Tokyo in Japan used animal experiments to compare the immune activity of bananas, grapes, apples,

watermelons, pineapples, pears, persimmons and other fruits. The results confirmed that among them, Bananas have the best effect. They can increase white blood cells, improve the function of the immune system, and produce TNF, a substance that attacks abnormal cells.

Professor Yamazaki’s experiments also found that the more ripe the banana, the more black spots on the skin, the higher its immune activity

.

Longan Water for Bright Eyes and Protective Eyes

(A friend’s experience is reposted below.)

My job requires me to stare at the computer all day, which is already It hurt my eyes very much, and I was distracted from work.

I still couldn’t spare my eyes. I liked reading novels and doing other things that required eyesight, so when I was in my early forties, I My eyes started to get into trouble. They were often dry and sore, or my eyes were red, or my eyelids were heavy and I was unable to open them.

A friend taught me a recipe a year ago. After using it for a year, I actually regained my good eyesight and can

use my eyes freely. My friend also benefited from this recipe after suffering from eye problems and introduced it to me. My friend has been wearing contact lenses since middle school, and he has been wearing them for more than thirty years. More than a year ago, my eyes were in bad condition, with unbearable dryness. As a result of the diagnosis and treatment, the doctor said that I had been wearing contact lenses all year round, and my eyes were damaged, so I needed to stop wearing them for half a year. But as soon as my friend stopped wearing contact lenses, his visual acuity suddenly dropped from 0.6 to 0.2. Both the doctor and his friend were very nervous. A friend taught me to drink a cup of longan water every day. Within a month, my vision returned to 0.6.

The ingredients used for this longan water are twelve dried longans with seeds, four red dates, and a small handful of wolfberries

Qi. There is no need to soak the red dates first, just make a cross with a knife.

Put all the ingredients into a ceramic mug

and fill it with 80% cold boiled water. Cover with a porcelain lid, put it into a rice cooker, put two spaces of water in the outer pot,

steam it and drink it.

I have been taking a cup of it every day for a year, and now I live my life as usual, using the computer and reading movies. My eyes never bother me anymore, and I am very happy.

Answer: Beibei Elf Girl - Beginner Disciple Level 1 11-24 21:38

Phenomena 1: Liquid evaporation.

Fix the thermometer on the crossbar of the iron bracket and observe the reading of the thermometer (ie, the room temperature value). Wrap two layers of dry gauze around the thermometer's temperature-sensing bulb (pasted slightly with paper tape), and use a fan to fan the bulb. You can see that the liquid column does not move.

Immerse the thermometer's temperature-sensitive bulb together with the gauze in alcohol, and you can still see that the thermometer's reading remains unchanged (the alcohol temperature is the same as room temperature).

When the alcohol bottle is removed, the thermometer reading will drop significantly as the alcohol on the gauze evaporates. At this moment, if you fan yourself against the temperature-sensing bubble of the thermometer, the reading of the thermometer will drop faster.

The above comparison demonstration shows that heat must be absorbed when liquid evaporates; fanning cannot reduce the temperature of an object, but can only speed up the evaporation of liquid.

Phenomena 2: "Heat quickly".

"Heat quickly" usually uses a thin metal tube to be wound into a heating coil. An electric heating wire is installed in the tube, and insulating materials such as magnesium oxide powder are poured into it. The package is fixed in the middle of the tube so that it does not come into contact with the tube wall. Both ends of the heating wire are connected to the power cord respectively. After energization, current flows through the heating wire, and the heating wire generates heat.

If the "heat fast" is immersed in a liquid, the heat will be quickly dissipated through the liquid, so that the liquid will be heated quickly without burning out the heating wire. If "Hot Fast" is allowed to dry-burn in the air, the heat will not be easily dissipated, and the metal outer tube will quickly burn or even burn red, and the electric heating wire inside the tube will burn out.

Because the electric heating wire in "Heat Fast" is made of nickel-iron alloy filament, it is generally brittle and easy to break. "Hot Fast" should not be vibrated violently. If there is scale or attachment on the surface, gently brush it off with a small brush. Do not hit it with a hard object or scrape it with a knife. "Heat Fast" is a commonly used electric heater in daily life. It can be used to boil water, heat milk, make coffee, etc., quickly and conveniently.

Phenomena 1: The aroma of food.

If we are cooking in the kitchen, cooking outside the house