Static electricity carried by human body is mainly due to less rainfall, lower humidity and dry air in winter. Long-term friction between skin and clothes, clothes and clothes will produce static electricity. Clothes made of leather and wool will generate more static electricity, which will exist in the body after being absorbed by the human body. It will be released to a certain extent, giving people the feeling of electric shock. If it is in a flammable and explosive place, it will cause fire or explosion.
In order to prevent the occurrence of static electricity, it is necessary to maintain a certain humidity indoors, often mop the floor, often sprinkle water, or humidify with a humidifier; Take a bath and change clothes frequently to eliminate the static charge accumulated on the surface of human body. When you find that your hair can't be combed, soak the comb in water for a while, and then comb your hair after the static electricity is eliminated. After taking off your clothes, gently touch the wall with your hands, and touch the wall with your hands before touching the door handle or faucet to "discharge" the static electricity in your body, so as not to hurt you. For the elderly, we should choose soft and smooth cotton or silk underwear and underwear, and try not to wear chemical fiber clothing to minimize the harm of static electricity.
1, wash your hands before going out, or put your hands on the wall first to remove static electricity! Try not to wear strange clothes.
2. In order to avoid electrostatic strike, you can use small metal devices (such as keys) and cotton cloth to touch doors, door handles, faucets, chair backs, bed railings, etc. To eliminate static electricity, and then touch them with your hands.
3. Wear cotton underwear.
4. When you are ready to get off, hold the gear with your right hand, then touch the iron part below with your fingers, then open the door, and put your left hand on the iron part of the door, but don't let go of your left hand, then let go of your right hand and get off. At this time, if you hold the door with your right hand, you will not get an electric shock. . Then push hard and it's done ~ ~
5. To deal with static electricity, we can adopt both "prevention" and "release". "Prevention", we should try to choose pure cotton products as fabrics for clothes and home decoration, and try to avoid using chemical fiber carpets and furniture with plastic as surface materials to prevent friction and electrification. Try to stay away from TV, refrigerator and other electrical appliances to prevent induction electrification. "Discharge" is to increase humidity and make local static electricity easy to release. When you turn off the TV and leave the computer, wash your hands and face immediately, so that the electrostatic charge on the skin surface can be released in the water. Try to choose high moisturizing cosmetics in winter. Commonly used humidifier. Some people like to keep ornamental fish and daffodils indoors, which is also a good way to adjust indoor humidity.
In addition, I recommend an economical and practical humidification method: put a basin of water under the heating, use an old towel (or absorbent cloth), put one end in the water and the other end on the heating, so that about three liters of water can be evaporated into the house day and night. If every heater does this, the whole room will feel damp and pleasant. it wont hurt you to try it
6. Bathing and changing clothes frequently can effectively eliminate the static electricity accumulated on the surface of human body.
In daily life, people sometimes accumulate static electricity because of clothes, climate, friction and other reasons. And when they suddenly come into contact with metal, they will feel the pain of electric shock, and even when it happens frequently at a certain stage, it will cause certain psychological pressure. If you avoid contact with iron for a while, you may accumulate more charges and get a bigger electric shock sooner or later.
Here are two tips to help prevent this kind of electric shock.
1. indoors, static electricity may be generated after the carpet rubs the sole, and the wind outside may make the body charged. Be careful to touch the iron gate when entering and leaving at this time, and your hands may get an electric shock. After repeatedly encountering such a situation, you can take the following measures to avoid electric shock:
When touching the iron gate, don't touch the iron gate directly with your hands. Instead, grab a bunch of keys in your pocket with your hand (usually it won't get an electric shock), and then touch the iron gate with the tip of the key, so that the electricity on your body will be discharged without getting an electric shock.
Principle: The pain of hand discharge is caused by high-voltage discharge. When discharging, the hand suddenly touches the iron gate very little, resulting in instantaneous high voltage. If you take the key out of your pocket, first press the key in a large area (a string of keys itself can't transfer much charge, so it won't get an electric shock at this time), and then use the key tip to touch the big conductor. At this time, the contact point of discharge is not a certain point on the skin of your hand, but the tip of the key, so your hand will not feel pain (maybe the key will! -If it hurts.
2. You often get an electric shock when you get off a taxi. It is mainly the static electricity accumulation caused by the friction between the body and the seat when getting off the bus. When closing the door after getting off the bus, the hand suddenly touches the iron gate and will get an electric shock.
When this often happens, it is best to pay attention to: when you get off the bus, that is, when your body rubs against the seat, you can hold the metal door frame in advance, so that static electricity can be discharged from your body at any time when it is generated by friction, so as to avoid discharging when you suddenly hit the iron gate after getting off the bus.
Six methods to prevent electrostatic intrusion
1. Check whether the power supply of the house is really grounded and whether the grounding is good. In fact, various socket power supplies in many families are ungrounded.
2. Ensure that the host and peripheral equipment are well grounded. The grounding end of the three-terminal plug can't be opened, so many families draw computer power from the power supply of the two-terminal plug, which is very dangerous.
Don't put the computer in a carpeted room.
4. Raise the indoor temperature, especially in dry winter. Humid air will reduce static electricity, and some static charges will be distributed to the moisture in the air through the surface of the machine.
5. Avoid wearing shoes with green soles. Walk in these shoes. Static charge will accumulate, but it cannot be released. When the hand touches a conductor such as a computer, it will discharge.
6. When opening the main computer case, be sure to touch the metal handle or other metal objects with your hands, so as to release the static electricity carried by your body and avoid damaging the computer.
How to effectively prevent static electricity?
First of all, from the mechanism of static electricity generation, we should start with reducing the insulation of related objects, so that even if two objects rub, they will not generate static electricity or generate less static electricity. The following main measures have been taken:
1. Keep the environment with a certain humidity. Practice has proved that in the northern region or dry winter, the cases of electrostatic failure are much more than those in the southeast coastal areas or other seasons. Therefore, in some important places, such as computer rooms, laboratories, and electronic instrument assembly and debugging workshops, the problem of maintaining a certain humidity should be considered, especially those closed air-conditioned rooms, which should have certain humidity control equipment.
2. Laying anti-static floor or carpet. At present, this kind of plastic floor or carpet product with certain conductivity can effectively suppress the static electricity generated by human walking.
3. Use ion air guns, ion heads, ion rods and other facilities to prevent static electricity within a certain range.
4. Semiconductor devices should be placed in antistatic plastic containers or antistatic plastic bags. This antistatic container has good conductivity and can effectively prevent static electricity. Of course, if possible, it should be put in a metal container or wrapped in metal foil.
5. Operators should wear anti-static hand straps on their wrists, which should have good grounding performance. This measure is the most effective.
However, please note:
Prevent the harm of static electricity to computers.
If you often wear woolen sportswear and winter clothes in dry winter or at work, you may have a short and stinging discharge when you occasionally touch the door handle or other metal objects. This phenomenon is called electrostatic discharge.
Under normal circumstances, more than 20000V electrostatic voltage can be accumulated in human body. When the user provides a conductive path for the flow of electrons, the accumulated charge in the body will rush out of the body and flow to the metal object closest to the user, resulting in a brief and stinging discharge, which is irritating, but generally harmless to the human body. But for professional technicians engaged in PC maintenance, the problem is not general. Maintenance personnel need frequent contact with various components when dealing with or replacing circuit boards and integrated circuit blocks, while semiconductor equipment is extremely sensitive to the stimulation from static electricity, and the damage of components is only between the first line.
Static electricity is mainly generated in the following aspects: First, there is a carpet on the floor of the computer room, which is easy to generate static electricity accumulation. Second, the wool fiber clothing worn by maintenance personnel is also a hotbed of static electricity. At the same time, wearing rubber insulated shoes can't release static electricity. In addition, the generation of static electricity is also related to climate. For example, in winter, the climate is dry and the temperature is low, and a lot of charges can be accumulated in the air, so the generation and release of static electricity is more obvious in winter. In summer, before static electricity is released, the temperature in the air can discharge most of the accumulated charges. In any case, electrostatic discharge exists to some extent, and the generation of static electricity is inevitable.
The main harm of electrostatic discharge is to destroy the sensitivity of electronic components. For some transistors, an electrostatic discharge of several hundred volts can completely disable them, which is by no means sensational. The most sensitive component to electrostatic discharge is the integrated circuit based on metal oxide semiconductor (MOS). The gate array CMOS chip in PC can withstand the electrostatic impulse voltage of 200V, the DRAM and EPROM chip can withstand the electrostatic impulse voltage of 300V, and the TTL chip can withstand the electrostatic impulse voltage of1000 V. It can be seen that if the harm of static electricity is not controlled, users may be completely unaware of it after destroying expensive integrated circuits.
The harm of static electricity to PC is mainly manifested in the following phenomena: disk reading and writing failure, printer printing confusion, chip breakdown and even motherboard burning.
How to avoid the harm of electrostatic discharge during PC maintenance? First, the shell of microcomputer equipment must be grounded, and some circuit boards should be encapsulated with conductive foam when not in use to avoid electrostatic damage. Second, the maintenance personnel should discharge static electricity in the body before touching the chip circuit with their hands.
There are two ways to release static electricity:
(1) Use a conductive fiber wristband. Put one end of the wristband around your wrist and the other end is firmly connected to the ground, so that static electricity can flow away from you.
(2) If there is no conductive wristband, you can also put your hand on the metal shell and touch it before opening the shell, so that the static electricity in the body can flow away along the ground wire of the power cord.
In the cold and dry winter, we are often disturbed by static electricity. When you get up in the morning, your hair will become messy and even stand up; When you take off your clothes and sleep at night, you often hear a crackling sound in the dark, accompanied by blue light; When you meet and shake hands, as soon as your fingers touch each other, you will suddenly feel a sharp pain in your fingertips, which is shocking.
Two conditions of static electricity generation
Static electricity refers to the charge that does not flow. Generally speaking, there are two conditions for the human body to generate static electricity, one is dry air, and the other is non-conductive chemical fiber clothing. In winter, there is less precipitation and the air is relatively dry, which leads to the abnormal dryness of the skin surface and the increase of the resistance value, resulting in a large amount of charge accumulation in some areas. If you wear chemical fiber clothes, the charge is more difficult to export. Once the conditions are ripe, touching the metal conductor with your hand will suddenly release the static electricity of the human body and make your fingers feel electrocuted.
Beware of electrostatic injury.
The human body itself also has bioelectricity, such as ECG, EEG, EMG, etc., which are all weak electric energy and maintain the function of organs. When the external current enters the human body, the human body becomes a part of the conductor in the circuit. Therefore, static electricity will also do harm to human body to a certain extent, and the degree of harm to human body is related to the intensity, frequency and voltage of current, contact position and contact time, the way of passing through human body and the functional state of human body when getting an electric shock.
The magnetic field generated by static electricity can often change the inherent potential difference in human body, affect various organs, especially hinder normal ECG conduction, thus affecting the normal electrophysiological process of myocardium. Usually, the influence on the heart is related to the strength of electrostatic magnetic field and heart function. If the static voltage is low, people with normal heart function will not have special symptoms except electric shock, but for people with fragile heart function, the magnetic field generated by static electricity can cause chest tightness, dizziness and shortness of breath, and in severe cases, it can cause arrhythmia, induce premature beats and aggravate the condition.
In addition, static electricity can also change brain potential, cause abnormal current conduction of brain nerve cell membrane, affect people's central nervous system, make people feel tired, fidgety, insomnia, headache, and even lead to mental illness. Furthermore, continuous static electricity easily affects the pH balance in the human body. Mild acidosis or alkalosis can make people feel nausea, general fatigue, vomiting, anorexia, and even severe symptoms such as shortness of breath and loss of consciousness.
Static electricity can also affect human skin. In winter, the temperature is low, the air is dry, and more and more static electricity is accumulated on human skin and object surface, which makes a large number of parts of the human body accumulate static electricity. In dry weather, nerve endings in the skin are easily stimulated, and they are more sensitive because of lack of water, so underwear plays a decisive role in skin health. At present, some chemical fiber underwear on the market is prone to static electricity because of its poor hygroscopicity. These static electricity can produce a large number of cations around the human body, which will reduce skin moisture, thus increasing dandruff and easily inducing skin itching.
Static electricity is harmful to patients with neurasthenia, hypertension, heart disease and mental illness. In particular, patients with cardiovascular and cerebrovascular diseases should take appropriate measures to prevent static electricity, because in the case of electric shock, mental stress suddenly leads to the sudden attack of cardiovascular and cerebrovascular diseases. In addition, static electricity is an invisible "killer" that people don't realize. Due to the large amount of electrostatic adsorption dust, it contains many harmful substances such as viruses and bacteria, which will affect human health after inhalation.
Teach you how to "discharge"
1. Humidity has a great influence on static electricity. When the air relative humidity is lower than 35%, it is easy to generate static electricity, while when the air relative humidity is higher than 45%, it is difficult to generate static electricity. Therefore, when the weather is dry, it is necessary to prevent static electricity, maintain a certain humidity indoors, mop the floor frequently and sprinkle water frequently; Conditional can use humidifier to humidify indoor air.
2. Static electricity accumulated in the body can be consumed by output, such as walking barefoot indoors to release static electricity accumulated on the body surface; When combing your hair, first immerse the comb in water to eliminate static electricity; After taking off your clothes, gently touch the wall with your hand. When touching electrical conductors such as door handles and faucets, touch the electrical conductors with your nails first, or touch items such as wet towels first, so as to "discharge" the static electricity in your body.
3. The room should be ventilated frequently to keep the air circulating. You can also sprinkle some water or put a basin or two of water at home to increase the humidity of the air. Take a bath and change clothes frequently to eliminate the accumulated charges and charged dust on the human body surface; Try to avoid using chemical fiber carpets, decorations and plastic ornaments in the bedroom, and place electrical appliances as little as possible in the bedroom. Old people, children, electrostatic sensitive person, patients with heart disease who can't find out the cause, neurasthenia and mental patients suggest that when buying a house, they should choose areas with large electromagnetic fields such as high-voltage lines, and it is best not to discharge electricity in the bedroom.
4. Soft cotton underwear is the best choice for underwear. The comfort of cotton products to the skin is more than twice that of ordinary fiber products, which is beneficial to the absorption and distribution of human sweat, easy to adjust the microclimate environment between skin and underwear, good hygroscopicity and warmth retention, and reduces static electricity generation and skin irritation. For the elderly, soft and smooth cotton or silk underwear should be chosen to minimize the harm of static electricity.
5. Due to the accumulation of static electricity in the body, the PH value of blood is alkaline, so it is necessary to increase the intake of foods containing vitamins C, A, E and acid, such as carrots, cabbage, tomatoes, etc., which can improve the acidity of blood and maintain the normal electrolyte balance of human body; Hairtail and turtle can not only increase the elasticity and moisture retention of skin, but also reduce the viscosity of blood; Bananas, apples, kiwis, etc. It contains a lot of vitamin C, which can resist cell oxidation and protect the normal work of cell membrane potential.
In the cold and dry winter, we are often disturbed by static electricity. When you get up in the morning, your hair will become messy and even stand up; When you take off your clothes and sleep at night, you often hear a crackling sound in the dark, accompanied by blue light; When you meet and shake hands, as soon as your fingers touch each other, your fingertips will suddenly have a needle-like pain. So try the following five tricks to make you "discharge" static electricity easily.
5 times to "discharge" static electricity
1. Humidity has a great influence on static electricity. When the weather is dry, it is necessary to prevent static electricity, maintain a certain humidity indoors, mop the floor frequently and sprinkle water frequently; Conditional can use humidifier to humidify indoor air.
2. Static electricity accumulated in the body can be consumed by output, such as walking barefoot indoors to release static electricity accumulated on the body surface; When combing your hair, first immerse the comb in water to eliminate static electricity; After taking off your clothes, gently touch the wall with your hands. When touching the door handle, faucet and other electrical conductors, first touch the electrical conductors with your nails, or touch wet towels and other items to "discharge" the static electricity in your body.
3. The room should be ventilated frequently to keep the air circulating; Try to avoid using chemical fiber carpets, decorations and plastic ornaments in the room; There should be as few discharges as possible in the bedroom.
4. It is best to choose soft cotton underwear, which is beneficial to the absorption and distribution of human sweat and reduces static electricity generation and skin irritation.
5. Due to the accumulation of static electricity in the body, the ph value of blood is alkaline, so it is necessary to increase the intake of foods containing vitamins C, A, E and acid, such as carrots, cabbage, tomatoes, etc., which can improve the acidity of blood and maintain the normal electrolyte balance of human body; Hairtail and soft-shelled turtle can not only increase skin elasticity and moisture retention, but also reduce blood viscosity.
How is static electricity generated?
Static electricity refers to the charge that does not flow. Generally speaking, there are two conditions for the human body to generate static electricity, one is dry air, and the other is non-conductive chemical fiber clothing. In winter, there is less precipitation and the air is relatively dry, which leads to the abnormal dryness of the skin surface and the increase of the resistance value, resulting in a large amount of charge accumulation in some areas. If you wear chemical fiber clothes, the charge is more difficult to export. Once the conditions are ripe, touching the metal conductor with your hand will suddenly release the static electricity of the human body and make your fingers feel electrocuted.
The human body itself also has bioelectricity, such as ECG, EEG, EMG, etc., which are all weak electric energy and maintain the function of organs. The magnetic field generated by static electricity can often change the inherent potential difference of human body. For people with weak heart function, the magnetic field generated by static electricity can cause chest tightness, dizziness and shortness of breath, and in severe cases, it can cause arrhythmia, induce premature beats and aggravate the condition.
Static electricity will hurt you.
Static electricity can also affect human skin. In winter, the temperature is low, the air is dry, and there are more and more electrostatic charges on human skin and object surface, which make electrostatic charges accumulate in a large number of parts of the body. In dry weather, nerve endings in the skin are easily stimulated and become more sensitive because of lack of water. Therefore, we should pay attention to skin moisturizing and choose cotton products for underwear.