Fix the thermometer on the rail of the iron bracket, and observe the reading of the thermometer at this time (that is, the room temperature value). Wrap two layers of dry gauze on the temperature-sensitive ball of the thermometer (slightly stick it with paper tape), and point the fan at the fan to keep the liquid column still.
Immerse the bulb of thermometer together with gauze in alcohol, and you can still see that the reading of thermometer remains unchanged (the temperature of alcohol is the same as room temperature).
When the alcohol bottle is removed, with the evaporation of alcohol on the gauze, the reading of the thermometer will drop obviously. At this time, fan the bulb of the thermometer, and the reading of the thermometer will drop faster.
The above comparison shows that liquid should absorb heat when it evaporates; Fans can't lower the temperature of objects, but only accelerate the evaporation of liquids.
Phenomenon 2: "Hot fast".
"Rapid heating" is usually made of a thin metal tube wound into a heating coil. The tube is filled with heating wires and insulating materials such as magnesium oxide powder, and the heating wires are encapsulated and fixed in the middle of the tube so as not to contact with the tube wall. Both ends of the heating wire are respectively connected with the power cord. After electrification, current flows through the heating wire, which generates heat.
If the "quick heat" is immersed in the liquid, the heat will be released quickly through the liquid, so that the liquid can be heated quickly and the heating wire will not be burned out. If left to air dry, the heat is not easy to dissipate, the metal outer tube will soon burn or even burn red, and the electric heating wire in the tube will also burn out.
Because the electric heating wire in "fast heating" is made of nickel-iron alloy, it is generally brittle and easy to break. "Quick heating" should not be shaken violently. If there is scale or attachment on the surface, you can gently brush it off with a small brush. Don't beat with hard objects, and don't scratch with a knife. "Quick heating" is a common electric heater in life, which can be used to boil water, warm milk and make coffee. It's fast and convenient.
Phenomenon 1: the taste of food.
If we cook and stir-fry in the kitchen, people outside can smell the food. Sometimes the oil in the pot is hot, and people outside the kitchen smell the oil. How is the fragrance smelled by people? During cooking, some molecules of food are evaporated into the air and gradually move in all directions. When they enter our nostrils, we smell the fragrance. This process is called diffusion. It is the diffusion of gas that helps people smell all kinds of smells.
Diffusion exists not only in gas, but also in liquid. When making soup, drop a few drops of soy sauce. Even if it is not stirred, the whole soup will gradually get a uniform soy sauce color and a strong soy sauce flavor. This is the result of the spread of soy sauce in the soup.
There is also diffusion between solids. Someone has done this experiment: a piece of lead and a piece of gold are polished and pressed together, and placed at room temperature (20℃) for five years. The gold and lead are connected together, and the depth of their mixing is about one centimeter. We know that gold and lead will not melt at room temperature, but their contact surfaces have formed a uniform layer of lead-gold alloy, which is a trick played by diffusion in solids.
Diffusion vividly proves that no matter what kind of substance, their molecules are always in motion, and when they contact each other, they will diffuse each other. With the increase of temperature, the random movement and diffusion of molecules are accelerated.
Phenomenon 2: Expanded popcorn.
"bang!" With a loud noise, the smell of popcorn drifted away. Popcorn is big, round, crisp and fragrant, and it is a very popular puffed food. The volume of rice suddenly expanded many times after being processed by explosive rice. No wonder some people humorously call the rice explosion machine "grain bulking machine"! So, how is the rice grain enlarged?
As we all know, the gas sealed in the container has special properties: the higher the temperature, the greater the pressure. When the rice explosion machine heats, the air pressure sealed in the tank gradually increases; At the same time, the rice inside is gradually heated, and the water stored in the rice gradually evaporates and accumulates in the tin can. The temperature of the tank is rising, and the air pressure in the tank is getting bigger and bigger. This high pressure prevents the water in the rice from continuing to evaporate, so that the water remaining in the rice gradually heats up and pressurizes, and the rice grains are like small balloons filled with gas, which can't burst just because they are constrained by the air pressure in the tank. When the air pressure in the tank rises to 2-3 atmospheres (as can be seen from the barometer), stop heating. At this time, the popcorn master put a long cloth bag on the mouth of the rice cake and then opened the lid. Just then, with a loud noise, rice was sprayed into the bag. The high-temperature and high-pressure rice grains suddenly entered the low-pressure environment, and the high-temperature and high-pressure water contained in the rice grains lost its binding force, so it expanded rapidly, making the rice grains expand rapidly and become popcorn.
Through popcorn, we saw the great power of "high temperature and high pressure". Festive fireworks, firecrackers, blasting in construction sites, steam hammers in factories, steam locomotives of Hercules ... 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 for production.
Phenomenon 1: grounding discharge.
The earth is a good conductor. Because it is very large, it can accept a lot of charges without obviously changing the earth's potential, just like pumping water from the ocean or releasing water into the ocean without obviously changing the sea level. If a charged conductor is connected to the earth by a wire, the charge will flow from the charged body to the earth until the conductor is particularly charged, so it can be considered that it is no longer charged. It is often necessary to avoid the accumulation of charge in production and life, and grounding is an effective measure at this time.
Phenomenon 2: Tip discharge.
Under normal circumstances, air is not conductive, but if the electric field is particularly strong, the positive and negative charges in air molecules may be "torn" by the strong electric field force in the opposite direction, which is called air ionization. Because ionized air has a freely movable charge, air can conduct electricity. The negative charge produced by air ionization is electrons, and the atoms that lose electrons are positively charged, which is called positive ions.
Because the same charges repel each other, the static charges on the conductor are always distributed on the surface, and generally the distribution is uneven, and the charges at the tip of the conductor are particularly dense, so the electric field in the air near the tip is particularly strong, which accelerates the movement of a small number of ions remaining in the air. These fast-moving ions hit air molecules and ionize more molecules. At this time, air becomes a conductor, so there is a phenomenon of tip discharge.
Phenomenon? B
Respondent: chenkooooooo- Juren Level 411-2421:30.
The warm foam in the snow bites the non-permanent insulator of the metal magnet, and can also act on the light through the current milk.
In fact, a lot of physics and life are closely related, and they are all related.
I just don't know which one you want.
If you think which one is the same as you think, you can find all the answers by searching online.
Respondent: Not a day-the level of children11-2421:32.
Why does warm water freeze faster than cold water?
At present, 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 that between cold water and the surrounding environment, and the energy of water molecules in warm water with large temperature difference will be quickly distributed 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 the molecular energy loss of cold water is slow. The problem is that warm water will eventually become cold water, and its crystallization speed should be the same as that of direct freezing of cold water. Therefore, considering the time it takes for warm water to cool into cold water, it should be concluded that cold water freezes faster than warm water anyway. It seems that this "temperature difference theory" is not worth pondering. Then, why does warm water freeze faster than cold water? There must be some unknown mechanism in the freezing process of warm water. Maybe in the near future, scientists will solve the mystery hidden around us.
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It often happens that the windows of the room are closed tightly and there is no air leakage, but it still feels windy. It seems strange. But there's nothing strange about it.
The air in the room is difficult to be completely calm. There is always some invisible air flowing in the room, which is caused by the heating or cooling of the air. Air becomes thinner when heated, so it becomes lighter; Cold, on the contrary, will become denser and heavier. Lighter warm air heated by electric lights or stoves will be squeezed upward by cold air and rise to the ceiling; Heavy cold air near a cold window or wall will sink to the floor.
We can observe this kind of indoor airflow with balloons played by children. Tie a small object under the balloon, so that the balloon will not fly all the way to the ceiling, but will only float in the air. So, put this balloon next to a burning stove, and it will be driven by invisible airflow and move slowly in the room. First, it rises from the stove to the bottom of the ceiling, then floats to the window, from there falls to the floor, then returns to the stove and goes around the room again.
In winter, although the windows are tightly closed and the cold outside can't penetrate, we can still feel the wind blowing, especially under our feet. That's why.
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Why do high jumpers run?
High jumpers can jump over the crossbar with the help of the inertia force of run-up and the supporting reaction force of take-off and landing. Because the direction of inertia force is horizontally forward and the supporting reaction force is vertically (or nearly vertically) upward, the body center of gravity after take-off moves along a parabolic trajectory. The height of this parabolic trajectory depends on the initial take-off speed and take-off angle, that is, the initial take-off speed and take-off angle are the key to increase the height of high jump. Generally speaking, these two values should be increased as much as possible. The maximum takeoff angle is 90 degrees. However, because the high jump is not a simple vertical upward movement, it must have forward strength to cross the crossbar; Furthermore, we must make full use of the horizontal speed to improve the initial takeoff speed, so the takeoff angle should be less than 90 degrees. As for the initial speed of take-off, it is closely related to the quality and technical proficiency of athletes. The higher the initial speed of Teng, the higher the jump. When the takeoff angle is constant, the initial takeoff speed plays a decisive role.
Why can you "drink" soda through a straw?
This is a common phenomenon in life. When the mouth has not inhaled from the tube, the liquid level inside and outside the tube is flat. At this point, the gas pressure on the liquid surface inside and outside the tube is equal; When the nozzle draws air from the pipe, the gas in the pipe decreases and the pressure on the liquid level in the pipe also decreases. At this time, the gas pressure acting on the liquid level inside the tube is less than the atmospheric pressure acting on the liquid level outside the tube. So we say that the reason for this phenomenon is the result of atmospheric pressure. When drinking soda, you should first insert the tube into the soda. When the mouth inhales, part of the gas in the tube will be sucked into the mouth, resulting in a larger volume of the remaining gas in the tube and a smaller pressure, which is less than the atmospheric pressure outside the tube. Therefore, under the action of atmospheric pressure outside the pipe, soda will rise along the pipe and be sucked into the mouth.
Why can thermos bottles keep warm?
There are three ways of heat transfer: thermal convection, thermal conduction and thermal radiation. Thermal convection mainly occurs between liquid and gas. The heat flow rises, the cold flow falls, and the dynamic balance is achieved through continuous circulation. The conduction of heat occurs on the thermal conductor, and the heat is conducted from the high temperature end to the low temperature end. The radiation of heat does not need medium, but transfers heat to low temperature through radiation. There is air between the bottle liner and the thermos shell. Air is a poor conductor of heat, which will reduce heat conduction. The inner liner is as smooth as a mirror, which reduces radiation, so the thermos bottle can keep warm.
Boiled eggs are easy to shell when soaked in cold water?
To understand this problem, we must first know what role water plays in this process. Most of the substances we encounter, except a few, have the physical property of "expanding with heat and contracting with cold". However, the degree of expansion and contraction of various substances is different. An egg consists of a hard shell, a soft protein and a yolk, and their expansion and contraction are different. When the temperature changes slightly or evenly, it doesn't show anything, but when the temperature changes sharply, the pace of protein and eggshell is different. When boiled eggs are suddenly soaked in cold water, the temperature of cold water changes greatly. The eggshell suddenly contracted. Protein is still at its initial temperature, and its size has not shrunk. At this time, a part of protein was squeezed into the short position of the egg by the eggshell, and then the protein gradually contracted due to the gradual decrease of temperature. Because protein, eggshell and yolk have different contractions, it forms the separation of protein and yolk. Therefore, if you peel it off, neither the eggshell nor the meat will come down.
Special feeling on the elevator
"Overweight" and "weightlessness" are two physical phenomena, and everything on the earth is affected by gravity. If an object is forced to accelerate upward against gravity, it will be overweight. If an object accelerates downward along gravity, it will show weightlessness.
Is the person who got an electric shock "sucked" by electricity?
It is often said that when you get an electric shock, people will be attracted by it and can't pull it out.
Actually, this statement is wrong. As we know, whether there is current or not, generally speaking, the positive and negative charges inside the positive conductor and the electrical appliance are equal, and the external electrostatic interaction cancels each other out. Even if there are occasional positive and negative charges in some places, they are not equal, and their electrostatic attraction can be ignored. But the problem has arisen. When people get an electric shock, why don't they sometimes pull their hands back? Don't you want to smoke it back? Obviously, it's stuck. I can't get it back. This problem can be explained by the physiological effect of current.
When people get an electric shock, their hands will change from spasm to paralysis due to the stimulation of current. Even if the command to withdraw the hand is issued, the helpless hand can no longer carry out this command. Investigation shows that the vast majority of people who died of electric shock were electrocuted in the palm of their hands or fingers on the same side as the palm of their hands. When just getting an electric shock, the hand bends due to conditioned reflex, and the bending direction is just for the hand to unconsciously hold the wire. In this way, the electric shock time is prolonged, and the hand will soon spasm and paralysis. At this time, even if you want to loosen your fingers and retract your arms, it is impossible. It looks like you have been "sucked". If the electric shock lasts a little longer, people's central nervous system will be paralyzed, and they will not hold hands at this time. These processes all took place in a relatively short time.
If you get an electric shock on the back of your hand, ordinary civil electricity is not easy to cause death. Experienced electricians, in order to judge whether the electric appliance leaks electricity, don't have a pencil at hand, and sometimes touch the shell of the electric appliance with their forefinger nails. If there is electricity leakage, the index finger will bend due to the reverse situation, and the bending direction is just the direction away from the electrical appliance. This shock time is short and there is no danger. Of course, the voltage is very high, so there will be danger.
Common sense of household electricity saving
Lighting energy-saving fluorescent lamp has the characteristics of high luminous efficiency, soft light, long life and low power consumption. 14 watt energy-saving fluorescent lamp is equivalent to the brightness of 75 watt incandescent lamp, so replacing incandescent lamp with fluorescent lamp can greatly reduce power consumption. Low-power fluorescent lamps can be installed in corridors and bathrooms. When watching TV, only turn on 1 watt energy-saving fluorescent lamp, which not only saves electricity, but also has ideal viewing effect. We should also turn off the lights and destroy the ever-burning lamps.
The brightest state of TV consumes 50-60% more power than the darkest state. The louder the volume, the greater the power consumption. So when watching TV, the brightness and volume should be adjusted to make people feel the best, not too bright and not too loud. This can not only save electricity, but also help to prolong the service life of TV sets. As long as some TV sets are plugged in, the picture tube will preheat, consuming 6 ~ 8 watts. So after the TV is turned off, you have to unplug it from the power outlet.
The refrigerator should be placed in a cool and ventilated place, never close to the heat source to ensure that the heat sink can dissipate heat well. When using, try to reduce the number and time of opening the door. The food in the refrigerator should not be too full, and there should be gaps between the foods to facilitate the convection of cold air. Frozen food to be eaten should be slowly melted in the freezer in advance, which can reduce the temperature of the freezer and save electricity.
The power consumption of the washing machine depends on the rated power of the motor and the length of service time. 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 clothes and the degree of dirt. Generally, the time for washing fine clothes such as silk can be shorter, and the time for washing thick fabrics such as cotton and hemp can be slightly longer. If you rinse with a washing machine, you can wring out soapy water or washing powder foam on clothes before rinsing, which not only saves electricity, but also reduces the number of rinsing and achieves the purpose of saving electricity.
Electric fans save electricity. Generally, electric fans with large blades have large electric power and consume a lot of electric energy. The power consumption difference between the fastest gear and the slowest gear of the same electric fan is about 40%, and the power consumption of the fast gear 1 hour can be used for nearly 2 hours in the slow gear. Therefore, slow speed is often used to reduce the power consumption of electric fans.
Phenomenon 1: liquid evaporation.
Fix the thermometer on the rail of the iron bracket, and observe the reading of the thermometer at this time (that is, the room temperature value). Wrap two layers of dry gauze on the temperature-sensitive ball of the thermometer (slightly stick it with paper tape), and point the fan at the fan to keep the liquid column still.
Immerse the bulb of thermometer together with gauze in alcohol, and you can still see that the reading of thermometer remains unchanged (the temperature of alcohol is the same as room temperature).
When the alcohol bottle is removed, with the evaporation of alcohol on the gauze, the reading of the thermometer will drop obviously. At this time, fan the bulb of the thermometer, and the reading of the thermometer will drop faster.
The above comparison shows that liquid should absorb heat when it evaporates; Fans can't lower the temperature of objects, but only accelerate the evaporation of liquids.
Phenomenon 2: "Hot fast".
"Rapid heating" is usually made of a thin metal tube wound into a heating coil. The tube is filled with heating wires and insulating materials such as magnesium oxide powder, and the heating wires are encapsulated and fixed in the middle of the tube so as not to contact with the tube wall. Both ends of the heating wire are respectively connected with the power cord. After electrification, current flows through the heating wire, which generates heat.
If the "quick heat" is immersed in the liquid, the heat will be released quickly through the liquid, so that the liquid can be heated quickly and the heating wire will not be burned out. If left to air dry, the heat is not easy to dissipate, the metal outer tube will soon burn or even burn red, and the electric heating wire in the tube will also burn out.
Because the electric heating wire in "fast heating" is made of nickel-iron alloy, it is generally brittle and easy to break. "Quick heating" should not be shaken violently. If there is scale or attachment on the surface, you can gently brush it off with a small brush. Don't beat with hard objects, and don't scratch with a knife. "Quick heating" is a common electric heater in life, which can be used to boil water, warm milk and make coffee. It's fast and convenient.
Phenomenon 1: the taste of food.
If we cook and stir-fry in the kitchen, people outside can smell the food. Sometimes the oil in the pot is hot, and people outside the kitchen smell the oil. How is the fragrance smelled by people? During cooking, some molecules of food are evaporated into the air and gradually move in all directions. When they enter our nostrils, we smell the fragrance. This process is called diffusion. It is the diffusion of gas that helps people smell all kinds of smells.
Diffusion exists not only in gas, but also in liquid. When making soup, drop a few drops of soy sauce. Even if it is not stirred, the whole soup will gradually get a uniform soy sauce color and a strong soy sauce flavor. This is the result of the spread of soy sauce in the soup.
There is also diffusion between solids. Someone has done this experiment: a piece of lead and a piece of gold are polished and pressed together, and placed at room temperature (20℃) for five years. The gold and lead are connected together, and the depth of their mixing is about one centimeter. We know that gold and lead will not melt at room temperature, but their contact surfaces have formed a uniform layer of lead-gold alloy, which is a trick played by diffusion in solids.
Diffusion vividly proves that no matter what kind of substance, their molecules are always in motion, and when they contact each other, they will diffuse each other. With the increase of temperature, the random movement and diffusion of molecules are accelerated.
Phenomenon 2: Expanded popcorn.
"bang!" With a loud noise, the smell of popcorn drifted away. Popcorn is big, round, crisp and fragrant, and it is a very popular puffed food. The volume of rice suddenly expanded many times after being processed by explosive rice. No wonder some people humorously call the rice explosion machine "grain bulking machine"! So, how is the rice grain enlarged?
As we all know, the gas sealed in the container has special properties: the higher the temperature, the greater the pressure. When the rice explosion machine heats, the air pressure sealed in the tank gradually increases; At the same time, the rice inside is gradually heated, and the water stored in the rice gradually evaporates and accumulates in the tin can. The temperature of the tank is rising, and the air pressure in the tank is getting bigger and bigger. This high pressure prevents the water in the rice from continuing to evaporate, so that the water remaining in the rice gradually heats up and pressurizes, and the rice grains are like small balloons filled with gas, which can't burst just because they are constrained by the air pressure in the tank. When the air pressure in the tank rises to 2-3 atmospheres (as can be seen from the barometer), stop heating. At this time, the popcorn master put a long cloth bag on the mouth of the rice cake and then opened the lid. Just then, with a loud noise, rice was sprayed into the bag. The high-temperature and high-pressure rice grains suddenly entered the low-pressure environment, and the high-temperature and high-pressure water contained in the rice grains lost its binding force, so it expanded rapidly, making the rice grains expand rapidly and become popcorn.
Through popcorn, we saw the great power of "high temperature and high pressure". Festive fireworks, firecrackers, blasting in construction sites, steam hammers in factories, steam locomotives of Hercules ... 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 for production.
Phenomenon 1: grounding discharge.
The earth is a good conductor. Because it is very large, it can accept a lot of charges without obviously changing the earth's potential, just like pumping water from the ocean or releasing water into the ocean without obviously changing the sea level. If a charged conductor is connected to the earth by a wire, the charge will flow from the charged body to the earth until the conductor is particularly charged, so it can be considered that it is no longer charged. It is often necessary to avoid the accumulation of charge in production and life, and grounding is an effective measure at this time.
Phenomenon 2: Tip discharge.
Under normal circumstances, air is not conductive, but if the electric field is particularly strong, the positive and negative charges in air molecules may be "torn" by the strong electric field force in the opposite direction, which is called air ionization. Because ionized air has a freely movable charge, air can conduct electricity. The negative charge produced by air ionization is electrons, and the atoms that lose electrons are positively charged, which is called positive ions.
Because the same charges repel each other, the static charges on the conductor are always distributed on the surface, and generally the distribution is uneven, and the charges at the tip of the conductor are particularly dense, so the electric field in the air near the tip is particularly strong, which accelerates the movement of a small number of ions remaining in the air. These fast-moving ions hit air molecules and ionize more molecules. At this time, air becomes a conductor, so there is a phenomenon of tip discharge.
Phenomenon 3: Spark discharge.
When a high-voltage charged body approaches a conductor, a strong electric field will instantly ionize the air between them, and the charge will form a current through the ionized air. Because the current is particularly large, it generates a lot of heat, which makes the air sound, glow and produce electric sparks. This discharge phenomenon is called spark discharge.
Spark discharge is often encountered in life. In dry winter, wearing sweaters and chemical fiber clothes, after walking for a long time, static electricity will accumulate on the body due to friction. At this point, if your finger is close to a metal object, your hand will feel tingling, which is caused by spark discharge. If you take a key in advance and keep the tip of the key close to other metal objects, you will avoid pain. Try it in the dark. When the tip of the key is close to the metal body, you will not only hear the noise, but also see the spark. In some factories or laboratories, there are a lot of combustible gases, so workers should wear a special kind of shoes, which have good conductivity and can introduce charges into the earth to avoid the accumulation of charges on the human body, thus avoiding spark discharge and fire.
Respondent: Yan Zheng-Jianghu rookie level 511-2421:33.
The strongest "stop burping method"
This is the point of traditional Chinese medicine-Laogong point.
Most people have to wait a long time for hiccups to disappear, which is very painful. Now we offer a hiccup that can stop quickly.
The way to stop burping is for your reference.
This method is an introduction to ancient times, and it is very simple. Is to press hard with the thumb of one hand.
The palm of the other hand (that is, Laogong point).
It doesn't matter whether you are left or right. Press the palm of one hand hard with the thumb of the other.
Central. Multiple presses will stop burping)
The book says that burping will stop in 3 minutes, but my experience is that automatic burping only takes 10 seconds.
Stop. It's amazing.
Rub your ears-make your head more flexible.
The air in the office is a stagnant ion freeze, even if the air conditioning system is running, people
People's heads still can't help but want to doze off, and even have habitual migraine or sudden irritability, so it is difficult to make some definite decisions.
Once I mentioned this symptom to my mother who is good at qigong meditation, and she caught me without saying anything.
One ear rubbed up, first of all, there was the kind of punishment that let the primary school discipline director catch pranks.
Punishment, I didn't expect my head to be balanced after a hot friction in my ears, as if there were
An invisible elf is sweeping dust on his head with a broom, which is amazing.
I can't tell you how comfortable it is
Later, my mother told me a principle that people's ears are covered with large and small acupuncture points, so give them proper thorns.
After the shock, the nervous brain can be quickly solved.
Before it's too late, try it as soon as you see it here! The harder you work, the more brilliant your head will be!
Suggestion: When sitting in an office, usually do it every 2 hours, each time 1-2 minutes.
Eat a ripe banana.
According to the research of Japanese scientists, TNF, a substance with anticancer effect in bananas, is fragrant.
The more mature the banana, the higher its anticancer effect.
Masayoshi Yamazaki, a professor at Tokyo University, compared bananas, grapes, apples,
The immune activity of watermelon, pineapple, pear and persimmon has been confirmed, among which the immune activity of banana is the most important.
It has the best effect, can increase white blood cells, improve immune system function, and can also produce abnormal attacks.
Tumor necrosis factor, cellular substance.
Professor Yamazaki's experiment also found that the more mature the banana, the more black spots on the epidermis, and the stronger its immune activity.
The higher.
Bright eyes and longan water
(A friend's voice, reposted as follows. )
My job required staring at the computer all day, which hurt my eyes, so I left my job.
I can't let my eyes go. I like reading novels and doing other things that require eyesight. So in his early forties, his eyes came, often dry and sore, or his eyes were red, and even his eyelids were heavy, so he could not open his eyes.
A friend taught me a prescription a year ago, and after using it for a year, my good eyesight was restored, but
Use my eyes freely. Friends also benefit from suffering from their eyes.
In this prescription, it was just introduced to me. My friend has been wearing contact lenses for 30 years since middle school. More than a year ago, my eyes were in poor condition and dry. As a result of diagnosis and treatment, the doctor said that I wear contact lenses all the year round and my eyes are damaged, so I need to stop using them for half a year. However, as soon as a friend stopped using contact lenses, his vision suddenly subsided from 0.6 to 0.2, and doctors and friends were greatly nervous. My friend is taught to drink a glass of longan water every day. In less than a month, vision returned to 0.6.
Longan water is made of twelve dried longan kernels, four red dates and a handful of citric acid.
Qi. Don't soak the red dates first, cross them with a knife. Put all the materials into the mug.
Pour eight full cold boiled water in the middle. Cover the porcelain cover, put it in the rice cooker, and put two sides of water in the outer pot.
Steamed and ready to drink.
I've had a drink every day for a year, and now all the days go on as usual, using the computer and bowing my head. It is said that my eyes will never bother me again, and my life is very happy.
Interviewee: Sister Beibei Elf-beginner level11-2421:38.
Phenomenon 1: liquid evaporation.
Fix the thermometer on the rail of the iron bracket, and observe the reading of the thermometer at this time (that is, the room temperature value). Wrap two layers of dry gauze on the temperature-sensitive ball of the thermometer (slightly stick it with paper tape), and point the fan at the fan to keep the liquid column still.
Immerse the bulb of thermometer together with gauze in alcohol, and you can still see that the reading of thermometer remains unchanged (the temperature of alcohol is the same as room temperature).
When the alcohol bottle is removed, with the evaporation of alcohol on the gauze, the reading of the thermometer will drop obviously. At this time, fan the bulb of the thermometer, and the reading of the thermometer will drop faster.
The above comparison shows that liquid should absorb heat when it evaporates; Fans can't lower the temperature of objects, but only accelerate the evaporation of liquids.
Phenomenon 2: "Hot fast".
"Rapid heating" is usually made of a thin metal tube wound into a heating coil. The tube is filled with heating wires and insulating materials such as magnesium oxide powder, and the heating wires are encapsulated and fixed in the middle of the tube so as not to contact with the tube wall. Both ends of the heating wire are respectively connected with the power cord. After electrification, current flows through the heating wire, which generates heat.
If the "quick heat" is immersed in the liquid, the heat will be released quickly through the liquid, so that the liquid can be heated quickly and the heating wire will not be burned out. If left to air dry, the heat is not easy to dissipate, the metal outer tube will soon burn or even burn red, and the electric heating wire in the tube will also burn out.
Because the electric heating wire in "fast heating" is made of nickel-iron alloy, it is generally brittle and easy to break. "Quick heating" should not be shaken violently. If there is scale or attachment on the surface, you can gently brush it off with a small brush. Don't beat with hard objects, and don't scratch with a knife. "Quick heating" is a common electric heater in life, which can be used to boil water, warm milk and make coffee. It's fast and convenient.
Phenomenon 1: the taste of food.
If we cook and stir-fry in the kitchen outside the house