What harm does frequent surfing the Internet do to people? A. eye disease: the computer screen has high brightness and the screen often beats. If users stare at the screen for a long time, their eyes will be overtired, which may lead to myopia, even retinal detachment and blindness.
B, cervical spondylosis, lumbar muscle strain, scapulohumeral periarthritis and other diseases: staying in the net all night, shoulders will be laid off. People who work at their desks or bury themselves in computers for a long time are prone to scapulohumeral periarthritis, especially in summer. C, leading to mental illness: Experts pointed out that excessive use of the Internet often leads to emotional disorders and social adaptation difficulties for teenagers. Psychologically, there will be inattention and persistence, memory loss, lack of interest in other activities, indifference, lack of sense of time and depression. In terms of behavior, there will be conduct disorder and aggressive behavior, that is, internet addiction.
D. If you surf the Internet for a long time in an environment with poor ventilation and sanitation or in an air-conditioned room, colds, gastrointestinal diseases, contact dermatitis, dizziness and headache are all common diseases.
1. Harm to teenagers' physical and mental health Internet addicts spend a lot of time surfing the Internet because of their excessive dependence on the Internet. Teenagers are at a critical stage of physical development, addicted to the online world, surfing the Internet continuously for a long time, and their metabolism and normal biological clock are seriously damaged, making them very weak. Another study shows that teenagers' long-term addiction to the Internet will not only affect their brain development, but also lead to nervous system disorder, hormone imbalance, decreased immune function, tension headache and even death. At the same time, the bad internet environment will also damage the health of teenagers. Most internet cafes have bad environment, turbid air and noisy sound. Teenagers who surf the Internet in such an environment are also vulnerable to diseases. Internet addiction is also a severe challenge to the sound psychological development of teenagers. Long-term surfing the Internet will lead to psychological diseases such as "onlineness" and "depression" among teenagers, paying too much attention to man-machine dialogue, lacking corresponding emotional response to the outside world, being indifferent to relatives and friends, and losing interest in the surrounding things. In serious cases, they are indifferent to everything and regard communication with others as a dispensable thing, becoming more and more withdrawn, resulting in personality defects of teenagers; Once internet addicts stop surfing the internet, they will have a strong desire to surf the internet, and it is difficult to control their need or impulse to surf the internet. This impulse makes them lose their concentration and persistence in other activities, work and study, resulting in psychological dislocation and movement obstacles of teenagers. "Online dating" and online chatting will lead to emotional entanglements of teenagers, leading to various emotional problems and psychological trauma of teenagers; Internet addicts are too addicted to the virtual role in the network, and easily lose themselves, bringing the rules on the network into real life, which creates obstacles for teenagers to know themselves. Second, it leads to the decline of teenagers' academic performance. Teenagers' addiction to the internet has brought many educational problems. Teenagers who are addicted to the internet are squeezed out of the time that originally belonged to reading and thinking by the internet, and the direct consequence is the decline of academic performance. At the same time, foreign research also shows that children who surf the Internet for a long time and indulge in online games will have a great impact on their intelligence, and even lead to IQ falling below the standard level of normal children, thus indirectly affecting their academic performance. In order to make money, there are also some online businesses that set up some websites to help write papers and homework to make a profit. Some teenagers who lack self-discipline buy homework from the internet to perfuse their teachers, and their serious attitude towards learning is greatly reduced, and their academic performance can be imagined. Internet addicts are addicted to the virtual world of the network and lose interest in real life, especially boring study. They will be tired of learning, play truant, drop out of school, and their academic performance will plummet. According to the survey of Shanghai 13 universities conducted by Institute of Psychology, Chinese Academy of Sciences, 8 1 students who dropped out of Shanghai University in 2004 were all addicted to online games, which led to a sharp decline in their studies. In 2000, among 237 students who dropped out of East China University of Science and Technology to repeat their studies, more than 80% were addicted to computer games. Among the 205 students who dropped out and transferred from Shanghai Jiaotong University, at least13 had to drop out or transfer because of uncontrolled use of computers, which led to a decline in their grades. Internet addiction has a great influence on college students' study and has become the main reason for them to drop out of school. Thirdly, weaken teenagers' moral consciousness and induce teenagers to commit crimes. In the network world, people's gender, age, appearance, identity, etc. It can be completely hidden with the help of network virtual technology, and people have no responsibility or obligation to communicate. People don't have to deal directly face to face, thus getting rid of many moral constraints in acquaintance society. In the online world, teenagers lack interpersonal relationships centered on teachers and parents to monitor their behavior. They are free and willful online, lack moral self-discipline, and are easy to indulge their desires in online games and pornographic websites. The evil side of human nature may also be fully vented because there is no moral constraint, which weakens the moral consciousness and social responsibility of teenagers and may lead them to the road of crime. At the same time, the network information is mixed, including some pornographic and violent information. Young people who are not deeply involved in the world are easily induced by bad habits and may eventually go astray. In recent years, violent crimes and sexual crimes committed by minors have increased significantly, which is closely related to the vigorous promotion of violence and pornography in online games. There are even some young people who commit crimes in order to pay internet fees. Since 2003, a district procuratorate in Shanghai has handled 8 cases of juvenile crimes caused by the Internet, accounting for1person, up 100% year-on-year. While other types of juvenile delinquency have steadily declined, juvenile delinquency caused by the Internet has risen sharply. Fourth, it affects the normal development of teenagers' interpersonal skills. First of all, most Internet addicts are withdrawn and indifferent, and easily estranged from real life, leading to more self-isolation, and then continue to move towards a lonely world of individuals, thus refusing to associate with others. At the same time, Internet addicts are addicted to the online world in virtual perfect and a virtual sense of satisfaction. They get the satisfaction of personal accomplishment from online games and personal belonging from online dating. They can fully display their personality in the online world. In the virtual online world, they already have everything. In the real world, everything is not so perfect, friends often cheat and lovers betray at any time. Therefore, they think that interpersonal communication in real life is dispensable, so they are unwilling to associate with others, refuse to associate with others, and refuse to integrate into society. This is a big problem brought by the Internet to teenagers with Internet addiction. Secondly, indulging in the online world has also led to a decrease in the frequency of communication between teenagers and others. They are obsessed with the man-machine dialogue mode, writing in front of the computer screen like water, gushing, losing the keyboard and mouse will make them silent, and in real life, their language expression ability will be hindered. Only when they are in front of the computer can they express their ideas by pressing their hands on the keyboard, which makes it more difficult for them to communicate with others better. What's more, they will get a social phobia. The survey shows that 56.3% of Internet addicts have poor interpersonal relationships. In contrast, 46% non-addicts can get along well with classmates and relatives. 5. Affect the formation of young people's correct outlook on life and values. In the network society, everything is open, and information reflecting different ideologies and values is popular on the Internet. The network content is rich and complex, and the good and the bad are mixed. Although network culture has diversified values, it is still dominated by western culture. Western countries use the Internet to publicize their political systems and cultural ideas. At the same time, some lawless elements or people or groups hostile to socialist China at home and abroad use the Internet to spread anti-socialist, anti-people, anti-* * * propaganda, and even deliberately distort the facts to confuse people. There are a lot of colorful information on the internet, among which yellow I navigation information and violent information are mixed together. There are also some people who artificially create viruses on the Internet to promote negative, decadent and even illegal ideas. Young Internet addicts with weak discernment and judgment are the first victims of internet addiction. The negative thoughts that teenagers come into contact with on the Internet will tilt their values, thus subtly affecting the formation of their correct outlook on life and values.
Seek adoption
What's the harm of playing computer often? Studies have confirmed that low-frequency radiation and magnetic fields emitted by computer screens can cause many diseases, including itchy eyes, neck and back pain, transient amnesia, irritability and depression. Computers have many adverse effects on people's health. Experts believe that people's concerns are not excessive. According to the survey, 83% of the people who often use computers feel eye fatigue, 63.9% suffer from shoulder pain and low back pain, 56. 1% and 54.4% suffer from headache and loss of appetite, and others suffer from autonomic nerve disorder, depression and arteriosclerosis psychosis. Harm of electromagnetic radiation Microcomputer operators are more or less harmed by electromagnetic waves emitted by microcomputers. X-ray of display is the main aspect of personal injury caused by microcomputer. Up to now, displays equipped with high-quality picture tubes can only be called "low-radiation" displays, and there is no non-radiation display. The radiation emitted by IC chip can completely cover the signal emitted by radio in a certain frequency band. Then, the phenomenon was deeply studied, and the conclusion was drawn that all "computers", regardless of size, have radiation with complex frequency as long as they are in working state. And some unexpected gains have been made: at present, the electromagnetic waves released by the computer mainframe that people often use have a greater impact on the human body than the radiation of the display. This is the reason why computer workers are "computer sick". Therefore, it is necessary to install the grounding wire for the computer. ? From a medical point of view, the human body is damaged to varying degrees by absorbing the radiation energy in the electromagnetic field, which mainly causes central nervous system dysfunction, palpitation, white blood cell changes, eye injuries, cataracts and so on. ? Although the electromagnetic field is invisible and intangible, we should pay attention to its harm and strengthen the protection of microcomputer. What symptoms can long-term computer use cause? The most common symptom is eye fatigue (drowsiness, heavy eyelids or forehead). Other symptoms, such as: eye sensation (red eye, tears, dryness), difficulty in concentration, headache, back pain, muscle spasm, etc.
Please accept it, thank you!
What harm does the Internet do to people? It depends on how you use it-personality disorder: some patients with schizoid personality disorder often have Internet addiction, and the lack of interpersonal communication and control makes them prone to addictive behavior. -Mood disorder: Different degrees of depression often lead to addictive behavior at the same time. -Psychological stress response and adaptation disorder: As a response to psychological stress and a means to cope with setbacks, surfing the Internet can alleviate the emotional tension and self-frustration caused by stress, so it will lead to Internet addiction. Schizophrenia: The prodromal and chronic phases of schizophrenia may be characterized by Internet addiction and other abnormalities. Patients are not interested in normal work and study, but rely too much on addictive things.
What are the harmful components in the atmosphere? Interpretation: 1 The gases that make up the atmosphere around the earth. Colorless and odorless, the main components are nitrogen and oxygen, and a very small amount of rare gases such as radon, helium, neon, argon, krypton and xenon, as well as water vapor, carbon dioxide and dust. 2, atmosphere: learning air is strong | Don't artificially create tense air. Physical properties of air: air is the gas around us. We can't see it or taste it, but when there is wind, we can feel the flow of air. At 0℃ and a standard atmospheric pressure (1.0105pa), the air density is 1.293 g/L, and the state of gas at 0℃ and a standard atmospheric pressure is called standard configuration. Air can be regarded as an ideal gas in standard configuration, and its molar volume is 22. The specific heat capacity of air is related to temperature. When the temperature is 250K, the specific heat capacity of air at constant pressure cp= 1.003kJ/(kg*K). At 300K, the specific heat capacity of air at constant pressure cp= 1.005kJ/(kg*K). State of air: At normal temperature, air is colorless and odorless gas, liquid air. Generally, when air is liquefied, carbon dioxide has been removed, so the components of liquid air are 20.95% oxygen, 78. 12% nitrogen and 0.93% argon, and other components are few, which can be omitted. As a mixed gas, when air condenses at constant pressure, the temperature decreases continuously. For example, under the standard atmospheric pressure (10 1.3KPa), air begins to condense at 8 1.7K (dew point), and when the temperature drops to 78.9K (bubble point), it becomes a saturated liquid. This is because the high-boiling components (oxygen and argon) condense more at the beginning, while the low-boiling components (nitrogen) condense more at the end of the process. Composition of air: The normal air composition of the earth is: nitrogen accounts for 78.08%, oxygen accounts for 20.95%, argon accounts for 0.93%, carbon dioxide accounts for 0.03%, and there are trace inert gases such as helium, neon, krypton and xenon. Ozone, nitrogen oxides, nitrogen dioxide In ancient times, air was once considered as a simple substance. 1669, You Mei inferred that the composition of air was very complicated according to the experiment of candle burning. About 1700, Starr of Germany put forward a general chemical theory, namely "phlogiston theory". He believes that there is an invisible so-called phlogiston, which exists in combustible substances. For example, when a candle burns, phlogiston escapes, and the candle shrinks and collapses into ashes. He believes that burning loses phlogiston, that is, candle-phlogiston = ashes. However, phlogiston theory cannot explain some phenomena in natural changes after all, and there are serious contradictions. The first is that no one has ever seen phlogiston; Incredibly, the mass of the second metal increases after combustion, so "phlogiston" must be negative. 1774, French chemist lavoisier put forward the theory of combustion oxidation, which denied the phlogiston theory. When lavoisier was doing the combustion experiments of metals such as lead and mercury, he found that some metals turned into colored powder, and the volume of air in the bell jar decreased by 65,438+0.5 of the original volume. The remaining air could not support the combustion, and animals would suffocate in it. He called the remaining 4/5 gas nitrogen. After he proved that the gas produced by priestley and Scheler from the decomposition of mercuric oxide was oxygen, the composition of air was determined as nitrogen and oxygen. The composition of air is mainly nitrogen and oxygen, which is caused by various changes in nature for a long time. Before the appearance of primitive green plants, the primitive atmosphere was dominated by carbon monoxide, carbon dioxide, methane and ammonia. After the emergence of green plants, the free oxygen released by plants during photosynthesis oxidizes carbon monoxide in the original atmosphere into carbon dioxide, methane into water vapor and carbon dioxide, and ammonia into water vapor and nitrogen. Later, due to the continuous photosynthesis of plants, most of the carbon dioxide in the air was absorbed in the process of plant photosynthesis, which made more and more oxygen in the air, and finally formed a modern air dominated by nitrogen and oxygen. Air is a mixture and its composition is very complicated. The constant components in the air are nitrogen, oxygen and rare gases, which are almost constant, mainly because of the mutual compensation of various changes in nature. The variable components of air are carbon dioxide and water vapor. The uncertain composition of air varies from region to region. For example, the air near the factory will contain ammonia, acid vapor and so on due to different production projects. In addition, the air also contains trace amounts of hydrogen, ozone, nitrogen oxides, methane and other gases. Dust is more or less an impurity suspended in the air. Generally speaking, the composition of air is relatively fixed. Stratification of air: The air wraps the earth, with a thickness of several Qian Qian meters. This thick layer of air is called the atmosphere. The atmosphere is divided into several different layers, which actually blend with each other. We live in the lowest layer (troposphere). In the stratosphere, the air is much thinner. There is a gas called "ozone" (a kind of oxygen), which can absorb harmful ultraviolet rays in the sun. Above the stratosphere is the ionosphere, where there is a layer of charged particles called ions. The ionosphere plays a very important role. It can reflect radio waves all over the world. If water vapor, carbon dioxide and various hydrocarbons are not considered, the average composition of air from the ground to the height of 100km remains unchanged. At an altitude of 25 kilometers, the ozone content increases. At higher altitudes, the composition of air varies with altitude and is obviously related to the time of day and solar activity. "Heavy" air: air is not weightless-the weight of a bucket of air is about the weight of two pages of a book. The air in the atmosphere always gives us pressure, which is called atmospheric pressure. Our human body bears about one kilogram per square centimeter. Because there is air in our body, the pressure is equal inside and outside, so the pressure of the atmosphere will not crush us. Air on which life depends: Due to the strong gravity of the earth, 80% of the air is concentrated in the average range of15km from the ground. This air layer has a great influence on human life and production activities. What people usually say about air pollution refers to the air pollution within this range. Air is a necessary condition for the survival of animals and plants on the earth, and the respiration of animals and the photosynthesis of plants are inseparable from air; The atmosphere can keep the temperature on the earth relatively stable. If there is no atmosphere, the temperature will be high during the day and low at night. The atmosphere can absorb the ultraviolet rays of the sun and protect life on earth from harm; The atmosphere can prevent high-energy particles from entering the earth too much and prevent meteorites from hitting the earth, because meteorites can slow down and burn when they rub against the atmosphere; The formation of wind, clouds, rain and snow is inseparable from the atmosphere; The spread of sound should use air; Parachutes, parachutes and airplanes also use the power of air; Some machines work with compressed air. Air quality: Without air, our earth would be a barren desert and lifeless. Green plants use air, sunlight and carbon dioxide in water to synthesize nutrients. In this process, oxygen is released. Humans and other animals get oxygen by breathing air. Animals also need oxygen to get energy from the food they eat. The development of industry has discharged harmful substances into the air, polluted the air and increased harmful components in the air. When harmful substances in the air reach a certain concentration, it will seriously damage human health and the growth of crops, destroy some substances, reduce people's visibility and affect traffic safety. Therefore, efforts must be made to prevent air pollution. Harmful substances discharged into the air can be divided into the following categories: dust (such as carbon particles, etc. ), metal dust (such as iron, aluminum, etc. ), wet fog (such as oil fog, acid fog, etc. ), and harmful gases such as carbon monoxide, hydrogen sulfide and nitrogen oxides. ). From a global perspective, sulfur dioxide and carbon monoxide are harmful gases with large emissions and great harm. Sulfur dioxide is produced when coal and oil are burned. Carbon monoxide is mainly emitted when the car is driving. Globally, it is estimated that carbon monoxide emissions exceed sulfur dioxide. According to the unified regulations of the State Environmental Protection Bureau, China's air quality is divided into five grades. It processes a series of complex air monitoring data according to a certain method, calculates the specific air pollution index, and then determines its air quality grade. The specific standards are as follows:1when the air pollution index reaches 0-50; Secondary from 5 1 to100; Third-level pawn101-200; Level 4 of 20 1-300; Level 5 when it is above 300. Among them, Grade 3 belongs to mild pollution, Grade 4 belongs to moderate pollution and Grade 5 belongs to severe pollution. Air pollution is a new branch of atmospheric science. It is a science that studies the transport, diffusion, dilution, transformation and removal of pollutants entering the atmosphere under different meteorological conditions and its application. This discipline sprouted in the 1920s, and the British conducted an atmospheric diffusion experiment at 192 1. However, it was not until the 1950s that the development of modern industry and the high concentration of urban population led to serious pollution incidents in cities or industrial areas. Take 1952 12 as an example, which claimed more than 4,000 lives. The research contents of air pollution meteorology mainly include: ① the types and characteristics of pollution sources and pollutants. (2) The process and law of pollutant transport and turbulent diffusion in the atmosphere. (3) Observation and calculation method of pollutant concentration. ④ Prevention and control methods of air pollution. ⑤ The harm of air pollution and its influence on human living environment. Meteorology of air pollution is of great significance to environmental protection, urban planning and energy, chemical industry, metallurgy, health, national defense and other departments. The research methods of air pollution meteorology include field measurement, laboratory (such as wind tunnel test) and numerical simulation. 1) air pollution due to human activities or natural processes, some harmful substances (called pollutants) are discharged into the atmosphere. When the emission is large enough (the concentration of pollutants reaches a certain limit), the original clean air quality will decline. If this situation is maintained for a long time, it will cause harm and adverse effects to human beings, animals, plants and articles in the atmosphere. This atmospheric state is called air pollution. There are three factors that constitute air pollution: pollution source, pollutant concentration and harm to people and organisms. A clean atmosphere is one of the necessary conditions for human survival. A person can live for five weeks without eating or drinking, but he will die if he doesn't breathe air for more than five minutes. The human body needs to inhale 10- 12 cubic meters of air every day. This shows how important it is to eliminate air pollution or keep the pollution concentration below a certain limit. The atmosphere has a certain self-purification ability. Before the development of modern large-scale industry, the amount of pollutants discharged into the atmosphere due to natural processes was basically balanced with the amount removed from the atmosphere through self-purification processes. However, after the 1950s and 1960s, with the rapid development of modern large-scale industry, the amount of pollutants discharged into the atmosphere by human beings greatly exceeded the self-purification ability of the atmosphere, resulting in the whole atmosphere being polluted to varying degrees. This has attracted the attention of all countries, and China has adopted environmental protection (atmospheric environment, water environment, etc.). ) as its basic national policy. 2) Pollution sources and pollutants that discharge harmful substances into the atmosphere are called pollution sources, and harmful substances that enter the atmosphere are called pollutants. Air pollution sources are divided into artificial sources and natural sources. Natural sources include volcanic eruptions, forest fires, wind-blown dust and so on. They release about 550 million tons of pollutants into the atmosphere every year. Man-made sources include industrial pollution sources, agricultural pollution sources, urban and rural traffic and residents' living pollution sources. In the 1990s, they discharged more than 650 million tons of pollutants into the atmosphere every year on average, among which industrial pollution discharge was the most important. During the period of 1990, the air pollutants emitted by industrial sources in China were about 400 million tons, which was far lower than the emission level of developed countries according to the average population. Air pollutants are divided into primary pollutants and secondary pollutants, and there are more than 100 kinds. After air is discharged into the atmosphere from pollution sources, it is directly polluted by primary pollutants, the most important of which are sulfur dioxide, carbon monoxide (CO), nitrogen oxides (NO), nitrogen dioxide, particulate matter (floating dust, dustfall, oil fume, etc. ), CO and ammonia, as well as organic compounds containing oxygen, nitrogen, chlorine and sulfur, and radioactive substances. The so-called secondary pollutants are harmful substances produced by sunlight irradiation, chemical reactions between pollutants and chemical reactions between pollutants and atmospheric components, and photochemical smog is one of the secondary pollutants. 3) Quality of Atmospheric Environment The quality of atmospheric environment for human survival and development is called atmospheric environmental quality or atmospheric quality. If the air is clean, the quality of the atmospheric environment will be high, for example, in mountainous areas far from cities or industrial areas; The air pollution in big cities or industrial areas is serious and the quality of atmospheric environment is low. The quality of atmospheric environment is usually measured by the concentration of atmospheric pollutants. The concentration of pollutants per unit volume of air is called pollutant concentration. According to the consideration of not endangering human body, ecosystem and articles, the allowable value of pollutant concentration is artificially specified, which is called the atmospheric environmental quality standard. When the concentration of the corresponding pollutants in the air is lower than the specified value, it is said that the air quality meets the standard, and when it is higher than the specified value, it is said that the air quality exceeds the standard (referred to as exceeding the standard). The more it exceeds the standard, the worse the quality of the atmospheric environment. All countries in the world have formulated their own standards. China promulgated the atmospheric environmental quality standard for the first time in 1982, and implemented three-level standards according to regional categories. For scenic spots and nature reserves, the first-class standards shall be implemented; Used in residential areas, commercial and cultural areas. , the implementation of secondary standards; Used in industrial areas, transportation hubs, etc. , the implementation of three standards. Specific standards of some pollutants are listed in the table. The concentration of atmospheric pollutants is usually determined by collecting and analyzing air samples with an atmospheric sampler. 4) Harm and influence of air pollution The harm and influence of air pollution on human beings and their living environment have been gradually recognized by people, which can be summarized as: ① Harm to human health. There are three ways for human body to suffer, that is, inhaling polluted air, skin contact with polluted air, and eating food containing atmospheric pollutants, which will not only cause respiratory and lung diseases, but also harm cardiovascular system and liver, and even seriously endanger people's lives. ② Harm to living things. Animals get sick or die from inhaling polluted air or eating food containing pollutants. Air pollutants will reduce the disease resistance of plants, affect their growth and development, and cause leaf spot or wither and die. ③ Damage to articles. Such as textiles and clothing, leather, metal products, building materials, cultural works of art, etc. , causing chemical damage and pollution damage. ④ Causing acid rain, which has adverse effects on agriculture, forestry and freshwater aquaculture. ⑤ Destroy the upper ozone layer and form an ozone hole, which is harmful to the living environment of human beings and organisms. ⑥ It has an impact on the global climate. For example, the increase of greenhouse gases such as carbon dioxide will lead to the warming of the earth's atmosphere and the increase of global weather disasters. For example, the increase of aerosol particles such as smoke and dust will increase atmospheric turbidity, weaken solar radiation, affect the long-wave radiation of the earth, and may lead to abnormal weather and climate. How to prevent and control air pollution and reduce its harm and influence has become a major and urgent research topic. 5) Prevention and control of air pollution Prevention and control of air pollution is a huge systematic project, which requires the joint efforts of individuals, collectives, countries and even countries around the world. The following measures can be considered: ① Reduce pollutant emissions. Pollution-free energy (such as solar energy, wind energy, hydropower generation), energy structure reform, low-pollution energy (such as natural gas), fuel pretreatment (such as desulfurization before burning coal), and improved combustion technology can all reduce pollutant emissions. In addition, before pollutants enter the atmosphere, some pollutants in waste gas can be eliminated by dust removal and smoke elimination technology, condensation technology, liquid absorption technology and recycling technology, so as to reduce the amount of pollutants entering the atmosphere. ② Control emissions and make full use of the self-purification ability of the atmosphere. Different meteorological conditions have different atmospheric capacity of pollutants, and the same pollutant discharge will cause different pollutant concentrations. For areas and time periods with strong wind, good ventilation, strong turbulence and strong convection, the atmospheric diffusion and dilution ability is strong, and it can accept more areas and time periods where the temperature of factories and mines is reversed. If the atmospheric diffusion and dilution ability is weak, it can't accept more pollutants, otherwise it will cause serious air pollution. Therefore, effective emission control should be carried out in different regions and different time periods.
What harm does drinking milk tea often do to people? Generally, milk tea sold in milk tea shops is blended with creamer, which contains a lot of trans fatty acids. Excessive intake of trans fatty acids is very harmful to human health, which easily hinders children's intellectual development, increases the risk of cardiovascular and cerebrovascular diseases in adults in the future, damages the memory of the elderly, and leads to Alzheimer's disease. Moreover, milk tea contains a substance that is difficult to digest and absorb, and it is easy to cause harm to the stomach if you drink it often.
What harm does tin do to people? Excessive tin is harmful.
Tin pneumoconiosis occurred when working in an environment where the concentration of tin dust was 9.362 mg/m3. Clinically, there are few symptoms such as cough, expectoration and chest tightness, and most patients have no change in lung function.
Most tin and its inorganic compounds are low toxic substances. Generally, as long as the protection is proper, there is no obvious harm to the human body in a short time. However, some tin salts and long-term exposure to tin dust can cause tin lung and may be neurotoxic! So if you are exposed to tin dust for a long time, you need to pay attention to protection, especially to protect the respiratory tract. Some tin salts, such as tin tetrachloride, should also protect your skin from contact! Because of the different varieties of tin, the harm to human body is also different, but most of them invade the respiratory tract and digestive tract, some damage the skin mucosa, and a few are neurotoxic! At the initial stage, there may be general respiratory manifestations: mild dyspnea and dry cough, which will not affect the working ability; Mid-term: obvious dyspnea, affecting work ability; Finally: unable to work. Malignant digestive tract, vomiting, abdominal pain, constipation, skin ulcer, neurotoxicity, listlessness in the early stage, obvious fatigue, chronic dizziness and headache in the later stage. If you want to know more about the harm of tin, you can visit Shanghai Nonferrous Metals.