Daily question on static electricity [Daily Question 20090402]

Friction generates static electricity. When the medium is in motion, friction between different media, as well as friction between the medium and pipes/equipment, can all lead to the generation of static electricity. The main methods for eliminating static electricity are by conducting it away, or by using static electricity eliminators.

1. Knowledge related to static electricity 1.1 Terms and definitions related to static electricity 1) Static electricity: Excess or deficient stationary charge on the surface of an object. 2) Electrostatic field: The electric field created by static electricity in its surroundings. 3) Electrostatic discharge: The transfer of static electricity between two objects with different electrostatic potentials, caused by direct contact or induction by an electrostatic field. Electrostatic discharge is the phenomenon in which, when the energy of the electrostatic field reaches a certain level, it breaks down the medium between them, resulting in discharge. 4) Grounding: Electrical equipment is connected to objects that can supply or receive a large amount of charge, such as the ground or ships. 1.2 Generation of static electricity: Static electricity is not electricity that is at rest; it is electricity that remains in one place on a macroscopic scale for a temporary period. Generally, it is in contrast to the currently widely used \"electrostatic current\"; friction can generate static electricity. 1.3 Electrostatics in different states of matter. Static electricity can be classified by state of matter into solid static electricity, liquid static electricity, and gas static electricity. 1.4 Characteristics of static electricity. 1) High voltage ； 2) Low energy ； 3) Tip discharge ； 4) Induced electrostatic discharge ； 5) Electrostatic discharge from insulators is very slow. 1.5 Operations in which static electricity can cause explosions and fires. 1) Transportation ； Vibrations during the movement of the tank truck, along with the intense friction between the flux and the walls of the tank, generate a large amount of static electricity. Additionally, the friction between the rubber tires of the tank truck and the ground also leads to the generation of static electricity, posing a risk of fire caused by static electricity. 2) Loading and unloading ； During the loading and unloading of flammable liquids, there are two factors that generate static electricity. First, static electricity is generated due to friction between the liquid and the conveying pipes; second, static electricity is produced as a result of shock and splashing when the liquid is poured into the container. Therefore, when pouring flammable liquids, the flow rate must be strictly controlled to prevent the generation and accumulation of static electricity. 3) High-speed jetting ； 4) The hazards of static electricity in the human body. 1.6 Basic conditions for explosions caused by static electricity. 1) There is a source of static electricity ； 2) Static electricity accumulates and reaches a voltage level sufficient to generate sparks ； 3) The spark energy of electrostatic discharge reaches the minimum ignition energy of the explosive mixture ； 4) There is a flammable gas mixture formed by combustible gases, vapors, and air around the electrostatic spark. 1.7 Factors affecting the level of static voltage or the magnitude of static charge. The higher the static voltage, or in other words, the greater the amount of static charge, the easier it is for discharge to occur. The level of voltage or the amount of static charge is primarily related to the following factors: A) The faster the flow rate, the greater the friction, and thus the higher the static voltage generated ； B) The drier the air, the harder it is to eliminate static electricity from the air, and the easier it is for the voltage to rise ； C) The greater the distance between the pipe outlet and the liquid surface, the more intense the friction between the material and air, and the more severe the disturbance and impact of the liquid flow on the surface; consequently, the voltage becomes higher ； D) The rougher the inner wall of the pipe, and the more elbows and valves it has, the higher the static voltage generated ； E) When the material contains moisture during transfer, the voltage generated is several times to dozens of times higher than that produced when there is no moisture ； F) Non-metallic pipes, such as those made of canvas, rubber, asbestos, cement, plastic, etc., generate static electricity more easily than metal pipes ； G) The denser the mesh of the filter screen installed on the pipeline, the higher the static voltage generated. The static voltage generated by dense felt filters is higher. H) When the atmospheric temperature is high (22–40°C) and the relative humidity of the air is between 13–24%, static electricity is very likely to be generated ； I) Under the same conditions, lightweight materials generate static electricity more easily than heavy materials. 1.8 Control of static electricity. A) Control flow rate ； B) Select appropriate materials ； C) Increase downtime ； D) Grounding. 81.9 Grounding. Grounding is the most common measure to eliminate the hazards of static electricity. A) All equipment used for processing, transporting, storing, and loading/unloading various flammable liquids, gases, and dusts must be grounded. Pipelines for transporting flammable materials must form a single unit and be grounded ； B) The connection wires for static grounding must possess sufficient mechanical strength and chemical stability; the connections should be reliable. During routine inspections, operators should regularly check to ensure that the grounding system is in good condition, with no interruptions, and that the grounding resistance does not exceed the specified value (100 ohms according to current regulations).

In the petrochemical production process, the most serious hazard of static electricity is combustion and explosion caused by static discharge. For electrostatic discharge to cause combustion and explosion, the following conditions must be present simultaneously: 1) Conditions for the generation of static electricity ； 2) It can accumulate sufficient charge and a sufficient discharge voltage ； 3) There is a suitable gap that can cause discharge ignition ； 4) The spark must have sufficient energy ； 5) The ignited combustible gas is within the explosion limit.

1. How is static electricity generated? Static electricity is generated when electrons in a material are forced to leave their orbits by an external force. Static electricity is the accumulation of charge. Based on the nature of the charge, electrostatics is divided into positive and negative types; based on the method of charge generation, it is divided into frictional charging and induced charging. When two different objects come into contact, one of the objects loses some charge; for example, electrons are transferred to the other object, causing it to become positively charged, while the other object gains those remaining electrons and thus becomes negatively charged. If it is difficult to neutralize the charges during the separation process, the charges will accumulate, causing the object to acquire static electricity. Therefore, an object acquires static electricity when it comes into contact with other objects and then separates from them. Typically, peeling a plastic film off an object is an example of triboelectric charging through contact separation; the static electricity generated when taking off clothes in daily life is also caused by contact separation. 2. What are the conditions that lead to accidents caused by static electricity? (1) Electrostatic accumulation (2) Sparking due to voltage release (3) Flammable substances in the air within the explosion range

Friction generates static electricity; it can occur when objects that are prone to generating static electricity move relative to each other, through friction between objects, or between a medium and pipes or equipment (such as belts and equipment), all of which can lead to the formation of static electricity. Static electricity can cause various accidents: electric shocks, fires, explosions, etc. If static electricity builds up to a certain level (as in the printing and papermaking industries, for example), contact between an object charged with static electricity and the human body can cause an electric shock ； Electrostatic discharge can cause fires and explosions in environments with fire and explosion hazards.

1. How is static electricity generated? The most common way static electricity is generated is contact-separation triboelectric charging. The following types of processes are prone to generating and accumulating hazardous static electricity: (1) large-scale friction of solid materials, (2) the crushing and grinding of solid materials ； The processes of screening, filtering, conveying, and drying of powder materials ； High-speed movement of suspended dust (3) Stirring various high-resistivity materials in mixers (4) High-resistivity liquids flowing at high speeds in pipes, the liquid being ejected from the pipe outlet and poured into containers (5) When liquefied gases, compressed gases, or high-pressure steam flow in pipes or are ejected from pipe outlets (6) People wearing fiber-based clothing and highly insulating shoes while moving around, standing up, etc. 2. What are the conditions that can lead to electrostatic accidents? (1) There are baozha* objects present in the space ； (2) Process conditions and operating procedures that generate static electricity ； (3) The static electricity accumulation reaches or exceeds a significant level, causing the local electric field between the media to be broken down ； (4) The spark energy of electrostatic discharge reaches the minimum energy of the explosive material. To cause a fire and explosion, all four of these conditions are essential. Therefore, it is necessary to: 1. Eliminate the explosion hazards in the surrounding environment. Typically, improving ventilation conditions is used to reduce the concentration of baozha* substances, or inert gases are introduced to lower the oxygen content. At the same time, explosion-proof measures should be adopted, and non-flammable media should be used in place of flammable ones. This is an indirect preventive measure. II. Appropriate materials can be selected, manufacturing processes and equipment can be improved, as well as the friction speed or relative movement speed of production tools reduced; impurities and excess static electricity can be eliminated to prevent the generation of static electricity. This is a direct measure to prevent fire accidents caused by static electricity. III. Limit static electricity accumulation through leakage and neutralization methods. Such as grounding, humidification, applying antistatic measures, and using static eliminators. To prevent static electricity from causing disasters and ensure absolute safety, in addition to the aforementioned preventive measures, it is also necessary to establish strict rules and regulations for the manufacturing processes. At the same time, technologies such as static electricity measurement and monitoring should be employed to properly assess the risks posed by static electricity in production areas and living spaces, thereby enabling proactive prevention of such problems.

Methods to eliminate and prevent static electricity include: (1) Static grounding. Grounding is the simplest and most basic method for eliminating the hazards of static electricity. It is mainly used to eliminate static electricity on conductors, and is not suitable for eliminating static electricity on insulators. (2) Humidification. Humidification means increasing the humidity of the air to eliminate the accumulation of static charge. In areas where there is a risk of static electricity, air conditioning units, misters, or wet cloths hung in the air can be installed, as permitted by the process conditions, to increase the relative humidity of the air. (3) Add antistatic additives. Antistatic additives are specially formulated auxiliary agents. Generally, just a trace amount of a few parts per thousand or even parts per ten thousand is sufficient to significantly eliminate static electricity during the production process. Phosphates, quaternary ammonium salts, etc. can be used as antistatic additives in the plastic and fiber industry ； Oleate salts and naphthenate salts can be used as antistatic additives in the petroleum industry ； Acetylene carbon ink and similar substances can be used as antistatic additives in the rubber industry. When using antistatic additives, it should be done in a way that does not affect the performance of the product; attention must also be paid to preventing the toxicity and corrosiveness of certain additives. (4) Electrostatic neutralizer. Electrostatic neutralizers work by utilizing electricity and ions. Based on their working principles and structures, they can generally be divided into inductive neutralizers, high-voltage neutralizers, radiation neutralizers, and ion flow neutralizers. (5) Process control method. Process control refers to taking appropriate measures within the process to limit the generation and accumulation of static electricity. There are many methods for process control, the main ones of which are as follows: ① Selecting materials with good electrical conductivity appropriately ； ②Reduce friction speed or flow rate ； ③Change the oil injection method (for example, it is best to inject oil from the bottom when filling, or along the tank wall) and the shape of the oil injection port ； ④Install a relaxation container ； ⑤Remove impurities mixed in oil tanks or pipelines ； ⑥Reduce the concentration of explosive mixtures.

1. How is static electricity generated? Since different substances require different amounts of work to remove electrons from their respective surfaces (this amount of work is known as the work function or extraction energy), electron transfer occurs at the point of contact when these two substances are in close contact. Substances with a low work function lose electrons easily and become positively charged, while substances with a high work function gain electrons and become negatively charged. The difference in work of emission among various substances is the basis for the generation of static electricity. The generation of static electricity is closely related to the electrical conductivity of a material. The lower the resistivity, the better the electrical conductivity. 2. What are the conditions that lead to accidents caused by static electricity? a. The accumulation and discharge of static electricity create ignition sources ； The presence of flammable and explosive materials in the vicinity constitutes flammability ； There are substances such as air and oxygen that serve as oxidizers. Once the above three conditions are met, and the energy of the static spark reaches the minimum ignition or explosion energy of the flammable material, a fire or explosion will occur. Of course, for an explosion to take place, the mixture of flammable material and oxidizing agents must be within its explosive limit. b. The second type of accident is a decomposition explosion, which can be triggered when the discharge spark reaches the minimum energy required for such an explosion. c. The third is that after the human body is discharged, secondary accidents such as falls occur. d. Other electrical accidents.

1. How is static electricity generated? All matter is composed of molecules, molecules are made up of atoms, and atoms consist of negatively charged electrons and positively charged protons. Under normal conditions, an atom has the same number of protons as electrons, resulting in a balance between positive and negative charges; therefore, it appears electrically neutral. However, electrons orbit around the atomic nucleus; when subjected to an external force, they leave their orbit, leaving the original atom and entering another atom, B. Atom A becomes positively charged due to the loss of electrons, and is called a cation. Atom B becomes negatively charged due to the gain of electrons, and is called an anion. The reason for the uneven distribution of electrons is that the electrons are forced out of their orbits by external forces; these forces include various forms of energy such as kinetic energy, potential energy, thermal energy, chemical energy, and so on. In daily life, static electricity is generated whenever two objects made of different materials come into contact and then separate. When two different objects come into contact, one of the objects loses some charge; for example, electrons are transferred to the other object, causing it to become positively charged, while the other object gains those remaining electrons and thus becomes negatively charged. If it is difficult to neutralize the charges during the separation process, the charges will accumulate, causing the object to acquire static electricity. Therefore, an object acquires static electricity when it comes into contact with other objects and then separates from them. 　Solids, liquids, and even gases can acquire static electricity due to contact separation. Gases are also composed of molecules and atoms; when air flows, these molecules and atoms undergo \"contact separation\" which results in the generation of electricity. Therefore, our surrounding environment and even our bodies carry static electricity to varying degrees. When this static electricity accumulates to a certain level, discharge occurs. 2. What are the conditions that lead to accidents caused by static electricity? 1 There are conditions for the generation of static electricity ； 2 can accumulate sufficient charge and a sufficient discharge voltage ； 3 There is a suitable gap that can cause discharge detonation ； 4 The spark must have sufficient energy ； 5 The ignited combustible gas is within the explosion limit.

I. How is static electricity generated? All matter is composed of molecules, molecules are made up of atoms, and atoms consist of negatively charged electrons and positively charged protons. Under normal conditions, an atom has the same number of protons as electrons, resulting in a balance between positive and negative charges; therefore, it appears electrically neutral. However, electrons orbit around the atomic nucleus; when subjected to an external force, they leave their orbit, leaving the original atom and entering another atom, B. Atom A becomes positively charged due to the loss of electrons, and is called a cation. Atom B becomes negatively charged due to the gain of electrons, and is called an anion. The reason for the uneven distribution of electrons is that the electrons are forced out of their orbits by external forces; these forces include various forms of energy such as kinetic energy, potential energy, thermal energy, chemical energy, and so on. In daily life, static electricity is generated whenever two objects made of different materials come into contact and then separate. 　　When two different objects come into contact, one of the objects loses some charge; for example, electrons are transferred to the other object, causing it to become positively charged, while the other object gains those remaining electrons and thus becomes negatively charged. If it is difficult to neutralize the charges during the separation process, the charges will accumulate, causing the object to acquire static electricity. Therefore, an object acquires static electricity when it comes into contact with other objects and then separates from them. Typically, peeling a plastic film off an object is an example of triboelectric charging through contact separation; the static electricity generated when taking off clothes in daily life is also caused by contact separation. 　　Solids, liquids, and even gases can acquire static electricity due to contact separation. This is because gases are also composed of molecules and atoms, and when air flows, these molecules and atoms undergo \"contact separation\" which results in the generation of electricity. 　　We are all familiar with triboelectric charge generation, but rarely hear of contact electrification. Essentially, triboelectric charging is a process of contact and separation that results in an imbalance of positive and negative charges. Friction is a process of continuous contact and separation. Therefore, triboelectric charge generation is essentially contact-separation charge generation. In daily life, various objects can generate static electricity due to movement or friction. 　　Another common type of charge generation is induced charge generation. When a charged object approaches an uncharged object, negative and positive charges are induced at the two ends of the uncharged conductor, respectively. 　　In the dry and windy autumn, in our daily lives, we often encounter such phenomena: at night, when taking off clothes to go to bed, we can hear crackling sounds in the darkness, accompanied by blue light; and when shaking hands with someone, as soon as our fingers make contact with theirs, we suddenly feel a stinging pain at the tips of our fingers, which is truly startling ； When combing hair in the morning, it often \"floats\" up, becoming more messy the more you try to arrange it; touching door handles or faucets can result in an electric shock, with a \"clicking\" sound occurring frequently. This is static electricity present in the human body, and the phenomena mentioned above are the result of that static electricity discharging outward. II. What are the conditions that lead to accidents caused by static electricity? In the petrochemical production process, the most serious hazard of static electricity is combustion and explosion caused by static discharge. For electrostatic discharge to cause combustion and explosion, the following conditions must be present simultaneously: 1) Conditions for the generation of static electricity ； 2) It can accumulate sufficient charge and a sufficient discharge voltage ； 3) There is a suitable gap that can cause discharge ignition ； 4) The spark must have sufficient energy ； 5) The ignited combustible gas is within the explosion limit. III. Static Electricity Control and Protection (I) Grounding Grounding involves directly discharging static electricity to the ground through a connection wire; this is the most direct and effective measure for preventing static electricity. For conductors, grounding is commonly used, such as by wearing anti-static wrist straps and grounding the work surfaces. Grounding is achieved through the following method: ① The human body is grounded via a wrist strap. ② The human body is grounded through anti-static shoes (or laces) and anti-static flooring. ③ The workbench surface is grounded. ④ Testing instruments, tool clips, soldering iron grounded. ⑤ Anti-static flooring, with floor mats connected to ground. ⑥ Anti-static transfer carts, boxes, and racks should be grounded as much as possible. ⑦ The anti-static chair is grounded. (II) Electrostatic shielding Electrostatically sensitive components are exposed to areas with static electricity during storage or transportation; electrostatic shielding can be used to reduce the impact of external static electricity on these electronic components. ① Anti-static turnover boxes, anti-static component boxes: used for the handling, transportation, and storage of sheets and components in workshops. ② Anti-static shielding bags: Used for the packaging, transportation, and storage of sheets and components; they also provide some level of moisture protection. ③ Anti-static tape: Used for various types of packaging boxes. ④ Anti-static IC strips and IC trays: used for the storage and handling of IC components in production workshops. It is prohibited to store ICs outdoors or transport them with the packaging removed before use. ⑤ Anti-static shelves, carts, and workbenches: Anti-static shelves and carts are widely used in electronics assembly workshops for the handling, transportation, and circulation of circuit boards and components. Anti-static shelves and workbenches must be connected to an anti-static ground, and the anti-static pads on trolleys should be connected to the anti-static ground via metal chains. ⑥ Anti-static work clothes and shoes: In manufacturing workshops that contain electrostatically sensitive components and require a certain level of cleanliness, employees are generally required to wear anti-static work clothes and shoes. ⑦ Anti-static finger gloves: It is necessary to wear anti-static finger gloves when employees at the workstations frequently handle workpieces or electrostatically sensitive components. (III) Neutralization: Static neutralization involves the ionization of the air surrounding a charged object; under the influence of an electromagnetic field or external forces, these charged ions move, allowing the charged object to attract opposite charges, thereby achieving neutralization and eliminating static electricity. An electrostatic eliminator is a device that generates ions. The static electricity on the surface of insulators and the static charges in the air must be eliminated using electrostatic neutralization methods. There are various types of static eliminators, such as self-inductive, high-voltage, and ion-flow types; the appropriate type should be selected based on the performance of each eliminator and the conditions at the site. (IV) Leakage ① Increase humidity: The humidification procedure and its scope of application should be determined based on the allowable relative humidity for different products and equipment; it is important not to raise the relative humidity indiscriminately in an attempt to eliminate static electricity. ② Add antistatic agents: This can increase the hygroscopicity or ionicity of insulating materials as well as their electrical conductivity, thereby accelerating the leakage of charges. ③ Use antistatic materials and products, such as antistatic flooring, workwear, and rubber mats. This post was last edited by lyhh9024 on 2009-4-2 13:48.]

The conditions for the generation of static electricity have been discussed in detail by those upstairs. Now, let’s introduce the characteristics of accidents caused by static electricity: There are mainly two types of hazards associated with static electricity; the first type of hazard arises from the interaction between charged objects. For example, when the aircraft’s airframe comes into contact with particles such as air, water vapor, and dust, the aircraft can become charged. If no measures are taken, this can severely disrupt the proper functioning of the aircraft’s radio equipment, leaving the aircraft unable to detect its surroundings and thus potentially leading to aviation accidents. In other words, static electricity can cause some precision electronic devices to stop functioning and interfere with signals, which may lead to accidents ； The second category is caused by static electricity sparks, which are also common in industrial production. If there are gases or dusts within the explosive range in the vicinity, encountering static electricity sparks can easily lead to combustion and explosion accidents. Although static sparks occur in an instant, they possess considerable energy. The ignition energy required for typical flammable gases or dust clouds ranges from several dozen mJ to over ten J, whereas the energy released by static sparks is often much higher than this ignition energy, which makes them a risk factor for causing fires and explosions. This post was last edited by DickGC on 2009-4-2 14:14]

Under normal circumstances, static electricity is generated when objects with high resistivity come into contact or are separated from each other. The faster the separation occurs and the higher the resistivity, the greater the voltage of static electricity produced. The hazard posed by static electricity is usually that it prevents normal operations; in flammable and explosive environments, static sparks can cause fires and explosions.

Friction generates static electricity. When the medium is in motion, friction between different media, as well as friction between the medium and pipes/equipment, can all lead to the generation of static electricity. The main methods for eliminating static electricity are by conducting it away, or by using static electricity eliminators

All matter is composed of molecules, which are in turn made up of atoms. Atoms consist of electrons with negative charges and protons with positive charges. Under normal conditions, an atom has the same number of protons as electrons, resulting in a balance between positive and negative charges; therefore, it appears electrically neutral. However, electrons orbit around the atomic nucleus; when subjected to an external force, they leave their original atom and enter another atom, B. Atom A becomes positively charged due to the loss of electrons, and is called a cation. Atom B becomes negatively charged due to the gain of electrons, and is called an anion. The reason for the uneven distribution of electrons is that the electrons are forced out of their orbits by external forces; these forces include various forms of energy such as kinetic energy, potential energy, thermal energy, chemical energy, and so on. In daily life, static electricity is generated whenever two objects made of different materials come into contact and then separate. When two different objects come into contact, one of the objects loses some charge; for example, electrons are transferred to the other object, causing it to become positively charged, while the other object gains those remaining electrons and thus becomes negatively charged. If it is difficult to neutralize the charges during the separation process, the charges will accumulate, causing the object to acquire static electricity. Therefore, an object acquires static electricity when it comes into contact with other objects and then separates from them. Typically, peeling a plastic film off an object is an example of triboelectric charging through contact separation; the static electricity generated when taking off clothes in daily life is also caused by contact separation. Solids, liquids, and even gases can acquire static electricity due to contact separation. This is because gases are also composed of molecules and atoms, and when air flows, these molecules and atoms undergo \"contact separation\" which results in the generation of electricity. We are all familiar with triboelectric charge generation, but rarely hear of contact electrification. Essentially, triboelectric charging is a process of contact and separation that results in an imbalance of positive and negative charges. Friction is a process of continuous contact and separation. Therefore, triboelectric charge generation is essentially contact-separation charge generation. In daily life, various objects can generate static electricity due to movement or friction. Another common type of charge generation is induced charge generation. When a charged object approaches an uncharged object, negative and positive charges are induced at the two ends of the uncharged conductor, respectively. In the dry and windy autumn, in our daily lives, we often encounter such phenomena: at night, when taking off clothes to go to bed, we can hear crackling sounds in the darkness, accompanied by blue light; and when shaking hands with someone, as soon as our fingers make contact with theirs, we suddenly feel a stinging pain at the tips of our fingers, which is truly startling ； When combing hair in the morning, it often \"floats\" up, becoming more messy the more you try to arrange it; touching door handles or faucets can result in an electric shock, with a \"clicking\" sound occurring frequently. This is static electricity present in the human body, and the phenomena mentioned above are the result of that static electricity discharging outward. When the human body is in motion, friction occurs between the skin and clothing, as well as between pieces of clothing, which generates static electricity. With the increase in household appliances and people wearing more synthetic fabrics in winter, the static electricity generated by these appliances is absorbed by the human body and accumulated there. Additionally, since the walls and floors in homes are often insulators and the air is dry, it is easier to experience interference from static electricity. Due to factors such as the relatively drier skin of the elderly compared to younger people, as well as the aging of their cardiovascular system and reduced resistance to disturbances, the elderly are more susceptible to the effects of static electricity. In the elderly who already suffer from various cardiovascular disorders, static electricity can exacerbate their conditions or trigger arrhythmias such as ventricular premature beats. Excess static electricity can also often cause irritability, headaches, chest tightness, difficulty breathing, and coughing. To prevent static electricity, it is necessary to maintain a certain level of humidity indoors; the floor should be mopped frequently, water should be sprayed regularly, or a humidifier can be used to increase the humidity ； Bathe frequently and change clothes often to eliminate the static charge accumulated on the human body surface. When you find that your hair won’t braid, soak the comb in water for a moment; once the static electricity is eliminated, you’ll be able to braid your hair easily. After taking off your clothes, gently touch the wall with your hand. Before touching door handles or faucets, also touch the wall with your hand to discharge any static electricity in your body; this way, the static electricity won’t harm you. For the elderly, soft and smooth cotton or silk underwear should be chosen; ** it is advisable to avoid wearing synthetic fabrics in order to minimize the risks associated with static electricity. How to prevent static electricity: When a person moves, friction occurs between the skin and clothing, as well as between pieces of clothing, which generates static electricity. With the increase in household appliances and people wearing more synthetic fabrics in winter, the static electricity generated by these appliances is absorbed by the human body and accumulated there. Additionally, since the walls and floors in homes are often insulators and the air is dry, it is easier to experience interference from static electricity. Due to factors such as the relatively drier skin of the elderly compared to younger people, as well as the aging of their cardiovascular system and reduced resistance to disturbances, the elderly are more susceptible to the effects of static electricity. In the elderly who already suffer from various cardiovascular disorders, static electricity can exacerbate their conditions or trigger arrhythmias such as ventricular premature beats. Excess static electricity can also often cause irritability, headaches, chest tightness, difficulty breathing, and coughing. To prevent static electricity, it is necessary to maintain a certain level of humidity indoors; the floor should be mopped frequently, water should be sprayed regularly, or a humidifier can be used to increase the humidity ； Bathe frequently and change clothes often to eliminate the static charge accumulated on the human body surface. When you find that your hair won’t braid, soak the comb in water for a moment; once the static electricity is eliminated, you’ll be able to braid your hair easily. After taking off your clothes, gently touch the wall with your hand. Before touching door handles or faucets, also touch the wall with your hand to discharge any static electricity in your body; this way, the static electricity won’t harm you. For the elderly, soft and smooth cotton or silk underwear should be chosen; ** it is advisable to avoid wearing synthetic fabrics in order to minimize the risks associated with static electricity. 1. Wash your hands before going out, or wipe them against the wall to remove static electricity; also, try to avoid wearing synthetic fiber clothing. 2. To avoid static shock, use small metal objects (such as keys) or cotton rags to touch the door, doorknobs, faucets, chair backs, bed rails, etc. first in order to discharge static electricity, and then touch them with your hands. 3. Wear 100% cotton underwear. 4. When it’s time to get out of the car, use your right hand to hold the gear shift, then touch the metal part below it with your fingers. Open the car door, place your left hand on the metal part of the door, but don’t let go of it. Then release your right hand and get out of the car; by doing this, you’ll not get an electric shock if you use your right hand to hold the door~~ Ha. . Next, close it firmly – done~~ 5. To deal with static electricity, we can adopt both preventive and discharge methods. “To prevent this, we should try to use cotton products as materials for clothing and home decorations, and avoid using synthetic fiber carpets and furniture with plastic surfaces, in order to prevent static electricity from being generated. Stay as far away as possible from electrical appliances such as televisions and refrigerators to prevent induced electricity. “\"Release\" means increasing humidity so that local static electricity can be released more easily. When you turn off the TV and step away from the computer, you should wash your hands and face right away to allow the static charge on the skin’s surface to be released in the water. In winter, it is advisable to choose cosmetics with high moisturizing properties. Common humidifiers. Some people like to keep ornamental fish and daffodils indoors, which is also a good way to regulate indoor humidity. Additionally, I recommend an economical and effective way to humidify the air: place a basin of water under the heater, and use an old towel (or a cloth with good absorbency), putting one end of it in the water and the other end over the heater. In this way, about three liters of water can evaporate into the room throughout the day and night. If every heater does this, the entire room will feel moist and pleasant. You might give it a try. 6. Bathing frequently and changing clothes often can effectively eliminate the static electricity accumulated on the human body surface. In daily life, due to factors such as clothing, climate, and friction, the body often accumulates static electricity. And when metal is suddenly touched, the pain of an electric shock is experienced; if this happens frequently at certain times, it can even cause psychological stress. If contact with iron objects is avoided for the time being, more charge may accumulate on the body, leading to a stronger electric shock sooner or later. Here are two tips that can help prevent this type of electric shock. 1. Inside a house, static electricity can be generated as a result of friction between the carpet and shoe soles; outside, wind can also cause one to become charged electrically. Be careful when going in and out and touching the iron door, as your hand might get an electric shock. After encountering such situations repeatedly, one can take the following steps to avoid electric shock: when touching an iron door, do not touch it directly with your hands; instead, first grasp a set of keys in your pocket with your hand (this usually prevents electric shock). Then, use the tip of one of the keys to make contact with the iron door. In this way, the electricity in your body will be discharged, and you will not suffer an electric shock. Principle: The pain caused by discharge on the hand is due to high-voltage discharge. When the hand comes into contact with an iron door during discharge, the area of contact is extremely small, which results in an instantaneous high voltage. If you take the keys out of your pocket, first hold the keys in your hand over a larger area (a set of keys cannot carry much charge, so there will be no electric shock at this point); then use the tip of one of the keys to touch the large conductor. In this case, the point where discharge occurs is not a spot on the skin of your hand, but rather the tip of the key, so your hand won’t feel pain (the key might, however!) ----If it hurts). 2. Electric shocks also often occur when getting out of the taxi. This is mainly due to the accumulation of static electricity caused by friction between the body and the seat when getting out of the vehicle; when the door is closed after getting out, touching the metal door with the hand can result in an electric shock. When this situation occurs frequently, it’s advisable to be careful: when getting out of the vehicle, that is, when there is friction between the body and the seat, it’s best to hold onto the metal door frame in advance. This allows static electricity generated by the friction to be discharged at any time, preventing a discharge when touching the metal door after getting out. The advantages and disadvantages of static electricity: We know that friction can generate electricity. The positive and negative charges after friction are bound to the charged object. It cannot move in a directed manner like the charge in wires; therefore, it is called static charge, or simply static electricity. There are many hazards associated with static electricity, and the first of these hazards stems from the interaction between charged objects. When the aircraft’s airframe comes into friction with particles such as air, water vapor, and dust, the aircraft becomes charged. If no measures are taken, this can severely disrupt the proper functioning of the aircraft’s radio equipment, leaving the aircraft unable to function properly ； In printing plants, static electricity between paper sheets can cause them to stick together, making it difficult to separate them and causing problems in printing ； In a pharmaceutical factory. Static electricity attracting dust can prevent the drugs from achieving the required purity level ； When the TV is on, the static electricity on the screen surface tends to attract dust and grease, forming a layer of dust that reduces the clarity and brightness of the image ； The dust that is common on blended clothing and difficult to remove is also caused by static electricity. The second major hazard of static electricity is the possibility of an explosion occurring when static sparks ignite certain flammable materials. On a pitch-black night, when we take off nylon and woolen clothes, sparks and popping sounds are produced, but this is basically harmless to the human body. But on the operating table, in addition to electric sparks, they can cause explosions of ** agents, harming both doctors and patients ； In coal mines, it can cause gas explosions, resulting in worker deaths and injuries as well as the abandonment of the mine. In short, electrostatic hazards arise from electricity and static sparks; the most severe form of such hazards is static discharge, which can cause fires and explosions of flammable materials. It is often said that prevention is better than cure; measures to avoid static electricity generally involve reducing flow rates and volumes, modifying processes that generate a lot of static electricity, and using equipment and materials that produce less static electricity. The simplest and most reliable method is to ground the equipment with wires, which allows charges to be directed to the ground and prevents static electricity from building up. Careful passengers will probably notice ； Discharge brushes are installed at the tips of both wings and at the tail of the aircraft. To prevent passengers from being electrocuted when getting off the plane, special grounding tires or wires are used on the aircraft’s landing gear ； To discharge the static electricity generated by the aircraft in the air. We also often see an iron chain trailing from the rear of oil tankers; this is the vehicle’s grounding wire. Increasing the humidity in the working environment appropriately to allow charges to be released at any time can also effectively eliminate static electricity. That’s why it’s not easy to conduct static electricity tests in humid weather. The antistatic agents studied by researchers can effectively eliminate static electricity within insulators. However, everything has two sides. Regarding static electricity, that hidden troublemaker. As long as one understands its temperament and makes use of its strengths while avoiding its weaknesses, it can also be used to serve humanity. For example, technologies such as electrostatic printing, electrostatic spraying, electrostatic flocking, electrostatic dust removal, and Hongdian sorting have been widely applied in industrial production and daily life. Electrostatics is also playing an important role in desalinating seawater, as well as in various applications such as spraying pesticides, artificial rainfall, and cryogenic freezing. Electrostatic devices like electrostatic feeders are even installed on spacecraft.

1. Generation of static electricity: The most common way static electricity is generated is through contact separation charging. When two objects come into contact with a distance of less than 25×10-8 cm between them, electron transfer occurs, resulting in the formation of two charge layers of equal magnitude but opposite polarity on either side of the interface. Static electricity can be generated when two objects separate rapidly. The following processing steps are prone to generating and accumulating hazardous static electricity: (1) Friction of solid materials over large areas ； (2) The crushing and grinding of solid materials, as well as the screening, filtering, conveying, and drying of powdered materials ； High-speed movement of suspended dust ； (3) Stir various high resistivity materials in a mixer ； (4) High-resistivity liquids flowing at high speed in pipes, liquids being ejected from nozzles, liquids being poured into containers ； (5) When liquefied gases, compressed gases, or high-pressure vapors flow in pipes or are ejected from pipe openings ； (6) Persons wearing clothes made of synthetic fibers or high-insulation shoes while operating, walking, standing, etc. 2. The three elements that cause electrostatic accidents: 1. Sufficient discharge energy, 2. Generation of static electricity or accumulation of static charge, along with the fulfillment of discharge conditions ； 3. Explosive mixtures at appropriate concentrations. In summary, as long as one of these is missing, an electrostatic accident will not occur.

Comrades upstairs, thank you for all your hard work. A lot of information has been gathered, but in actual work, how many people are able to recognize the need to take preventive measures? ? :(

All matter is composed of molecules, molecules are made up of atoms, and atoms consist of negatively charged electrons and positively charged protons. Under normal conditions, an atom has the same number of protons as electrons, resulting in a balance between positive and negative charges; therefore, it appears electrically neutral. However, electrons orbit around the atomic nucleus; when subjected to an external force, they leave their orbit, leaving the original atom and entering another atom, B. Atom A becomes positively charged due to the loss of electrons, and is called a cation. Atom B becomes negatively charged due to the gain of electrons, and is called an anion. The reason for the uneven distribution of electrons is that the electrons are forced out of their orbits by external forces; these forces include various forms of energy such as kinetic energy, potential energy, thermal energy, chemical energy, and so on. In daily life, static electricity is generated whenever two objects made of different materials come into contact and then separate. 　　When two different objects come into contact, one of the objects loses some charge; for example, electrons are transferred to the other object, causing it to become positively charged, while the other object gains those remaining electrons and thus becomes negatively charged. If it is difficult to neutralize the charges during the separation process, the charges will accumulate, causing the object to acquire static electricity. Therefore, an object acquires static electricity when it comes into contact with other objects and then separates from them. Typically, peeling a plastic film off an object is an example of triboelectric charging through contact separation; the static electricity generated when taking off clothes in daily life is also caused by contact separation. 　　Solids, liquids, and even gases can acquire static electricity due to contact separation. This is because gases are also composed of molecules and atoms, and when air flows, these molecules and atoms undergo \"contact separation\" which results in the generation of electricity. 　　We are all familiar with triboelectric charge generation, but rarely hear of contact electrification. Essentially, triboelectric charging is a process of contact and separation that results in an imbalance of positive and negative charges. Friction is a process of continuous contact and separation. Therefore, triboelectric charge generation is essentially contact-separation charge generation. In daily life, various objects can generate static electricity due to movement or friction. 　　Another common type of charge generation is induced charge generation. When a charged object approaches an uncharged object, negative and positive charges are induced at the two ends of the uncharged conductor, respectively. 　　In the dry and windy autumn, in our daily lives, we often encounter such phenomena: at night, when taking off clothes to go to bed, we can hear crackling sounds in the darkness, accompanied by blue light; and when shaking hands with someone, as soon as our fingers make contact with theirs, we suddenly feel a stinging pain at the tips of our fingers, which is truly startling ； When combing hair in the morning, it often \"floats\" up, becoming more messy the more you try to arrange it; touching door handles or faucets can result in an electric shock, with a \"clicking\" sound occurring frequently. This is static electricity present in the human body, and the phenomena mentioned above are the result of that static electricity discharging outward.

1. How is static electricity generated? Answer: All matter is composed of molecules, molecules are made up of atoms, and atoms consist of negatively charged electrons and positively charged protons. Under normal conditions, an atom has the same number of protons as electrons, resulting in a balance between positive and negative charges; therefore, it appears electrically neutral. However, electrons orbit around the atomic nucleus; when subjected to an external force, they leave their orbit, leaving the original atom and entering another atom, B. Atom A becomes positively charged due to the loss of electrons, and is called a cation. Atom B becomes negatively charged due to the gain of electrons, and is called an anion. The reason for the uneven distribution of electrons is that the electrons are forced out of their orbits by external forces; these forces include various forms of energy such as kinetic energy, potential energy, thermal energy, chemical energy, and so on. In daily life, static electricity is generated whenever two objects made of different materials come into contact and then separate. When two different objects come into contact, one of the objects loses some charge; for example, electrons are transferred to the other object, causing it to become positively charged, while the other object gains those remaining electrons and thus becomes negatively charged. If it is difficult to neutralize the charges during the separation process, the charges will accumulate, causing the object to acquire static electricity. Therefore, an object acquires static electricity when it comes into contact with other objects and then separates from them. 　Solids, liquids, and even gases can acquire static electricity due to contact separation. Gases are also composed of molecules and atoms; when air flows, these molecules and atoms undergo \"contact separation\" which results in the generation of electricity. Therefore, our surrounding environment and even our bodies carry static electricity to varying degrees, and discharge occurs when this static electricity accumulates to a certain level. 2. What are the conditions that lead to accidents caused by static electricity? Answer: 1. Presence of hazardous materials that can cause fires and explosions. 2. Conditions that allow for the generation of static electricity. 3. Conditions that permit the accumulation of static electricity. 4. The spark energy resulting from static discharge is greater than the minimum ignition energy for static electricity

Static electricity is a manifestation of electric charge; friction can generate electricity. The other aspects are not very clear; it’s something that beginners should learn about*

I’m afraid it’s mainly caused by friction