fbpx
Wikipedia

For the science of static charges, see Electrostatics.

Static electricity is an imbalance of electric charges within or on the surface of a material or between materials. The charge remains until it is able to move away by means of an electric current or electrical discharge. Static electricity is named in contrast with current electricity, where the electric charge flows through an electrical conductor or space, and transmits energy.

Contact with the slide has left this child's hair positively charged so that the individual hairs repel one another. The hair can also be attracted to the negatively charged slide surface.

A static electric charge can be created whenever two surfaces contact and have worn and separated, and at least one of the surfaces has a high resistance to electric current (and is therefore an electrical insulator). The effects of static electricity are familiar to most people because people can feel, hear, and even see the spark as the excess charge is neutralized when brought close to a large electrical conductor (for example, a path to ground), or a region with an excess charge of the opposite polarity (positive or negative). The familiar phenomenon of a static shock – more specifically, an electrostatic discharge – is caused by the neutralization of a charge.

Contents

Materials are made of atoms that are normally electrically neutral because they contain equal numbers of positive charges (protons in their nuclei) and negative charges (electrons in "shells" surrounding the nucleus). The phenomenon of static electricity requires a separation of positive and negative charges. When two materials are in contact, electrons may move from one material to the other, which leaves an excess of positive charge on one material, and an equal negative charge on the other. When the materials are separated they retain this charge imbalance.

Contact-induced charge separation

Main article: Triboelectric effect
Styrofoam peanuts clinging to a cat's fur due to static electricity. This effect is also the cause of static cling in clothes.

Electrons can be exchanged between materials on contact; materials with weakly bound electrons tend to lose them while materials with sparsely filled outer shells tend to gain them. This is known as the triboelectric effect and results in one material becoming positively charged and the other negatively charged. The polarity and strength of the charge on a material once they are separated depends on their relative positions in the triboelectric series. The triboelectric effect is the main cause of static electricity as observed in everyday life, and in common high-school science demonstrations involving rubbing different materials together (e.g., fur against an acrylic rod). Contact-induced charge separation causes your hair to stand up and causes "static cling" (for example, a balloon rubbed against the hair becomes negatively charged; when near a wall, the charged balloon is attracted to positively charged particles in the wall, and can "cling" to it, appearing to be suspended against gravity).

Pressure-induced charge separation

Main article: Piezoelectric effect

Applied mechanical stress generates a separation of charge in certain types of crystals and ceramics molecules.

Heat-induced charge separation

Main article: Pyroelectric effect

Heating generates a separation of charge in the atoms or molecules of certain materials. All pyroelectric materials are also piezoelectric. The atomic or molecular properties of heat and pressure response are closely related.

Charge-induced charge separation

A charged object brought close to an electrically neutral object causes a separation of charge within the neutral object. Charges of the same polarity are repelled and charges of the opposite polarity are attracted. As the force due to the interaction of electric charges falls off rapidly with increasing distance, the effect of the closer (opposite polarity) charges is greater and the two objects feel a force of attraction. The effect is most pronounced when the neutral object is an electrical conductor as the charges are more free to move around. Careful grounding of part of an object with a charge-induced charge separation can permanently add or remove electrons, leaving the object with a global, permanent charge. This process is integral to the workings of the Van de Graaff generator, a device commonly used to demonstrate the effects of static electricity.

Removing or preventing a buildup of static charge can be as simple as opening a window or using a humidifier to increase the moisture content of the air, making the atmosphere more conductive. Air ionizers can perform the same task.

Items that are particularly sensitive to static discharge may be treated with the application of an antistatic agent, which adds a conducting surface layer that ensures any excess charge is evenly distributed. Fabric softeners and dryer sheets used in washing machines and clothes dryers are an example of an antistatic agent used to prevent and remove static cling.

Many semiconductor devices used in electronics are particularly sensitive to static discharge. Conductive antistatic bags are commonly used to protect such components. People who work on circuits that contain these devices often ground themselves with a conductive antistatic strap.

In the industrial settings such as paint or flour plants as well as in hospitals, antistatic safety boots are sometimes used to prevent a buildup of static charge due to contact with the floor. These shoes have soles with good conductivity. Anti-static shoes should not be confused with insulating shoes, which provide exactly the opposite benefit – some protection against serious electric shocks from the mains voltage.

This section needs additional citations for verification. Please help improve this article by . Unsourced material may be challenged and removed.
Find sources: "Static electricity"news · newspapers · books · scholar · JSTOR
(September 2010) ()

The spark associated with static electricity is caused by electrostatic discharge, or simply static discharge, as excess charge is neutralized by a flow of charges from or to the surroundings.

The feeling of an electric shock is caused by the stimulation of nerves as the neutralizing current flows through the human body. The energy stored as static electricity on an object varies depending on the size of the object and its capacitance, the voltage to which it is charged, and the dielectric constant of the surrounding medium. For modelling the effect of static discharge on sensitive electronic devices, a human being is represented as a capacitor of 100 picofarads, charged to a voltage of 4,000 to 35,000 volts. When touching an object this energy is discharged in less than a microsecond. While the total energy is small, on the order of millijoules, it can still damage sensitive electronic devices. Larger objects will store more energy, which may be directly hazardous to human contact or which may give a spark that can ignite flammable gas or dust.

Lightning

Natural static discharge
Small hairs standing up after a thunderstorm, as a result of the left over weak static electricity
Main article: Lightning

Lightning is a dramatic natural example of static discharge. While the details are unclear and remain a subject of debate, the initial charge separation is thought to be associated with contact between ice particles within storm clouds. In general, significant charge accumulations can only persist in regions of low electrical conductivity (very few charges free to move in the surroundings), hence the flow of neutralizing charges often results from neutral atoms and molecules in the air being torn apart to form separate positive and negative charges, which travel in opposite directions as an electric current, neutralizing the original accumulation of charge. The static charge in air typically breaks down in this way at around 10,000 volts per centimeter (10 kV/cm) depending on humidity. The discharge superheats the surrounding air causing the bright flash, and produces a shock wave causing the clicking sound. The lightning bolt is simply a scaled-up version of the sparks seen in more domestic occurrences of static discharge. The flash occurs because the air in the discharge channel is heated to such a high temperature that it emits light by incandescence. The clap of thunder is the result of the shock wave created as the superheated air expands explosively.

Electronic components

Many semiconductor devices used in electronics are very sensitive to the presence of static electricity and can be damaged by a static discharge. The use of an antistatic strap is mandatory for researchers manipulating nanodevices. Further precautions can be taken by taking off shoes with thick rubber soles and permanently staying with a metallic ground.

Static build-up in flowing flammable and ignitable materials

Static electricity is a major hazard when refueling an aircraft.

Discharge of static electricity can create severe hazards in those industries dealing with flammable substances, where a small electrical spark might ignite explosive mixtures.

The flowing movement of finely powdered substances or low conductivity fluids in pipes or through mechanical agitation can build up static electricity. The flow of granules of material like sand down a plastic chute can transfer charge, which can be easily measured using a multimeter connected to metal foil lining the chute at intervals, and can be roughly proportional to particulate flow. Dust clouds of finely powdered substances can become combustible or explosive. When there is a static discharge in a dust or vapor cloud, explosions have occurred. Among the major industrial incidents that have occurred are: a grain silo in southwest France, a paint plant in Thailand, a factory making fiberglass moldings in Canada, a storage tank explosion in Glenpool, Oklahoma in 2003, and a portable tank filling operation and a tank farm in Des Moines, Iowa and Valley Center, Kansas in 2007.

The ability of a fluid to retain an electrostatic charge depends on its electrical conductivity. When low conductivity fluids flow through pipelines or are mechanically agitated, contact-induced charge separation called flow electrification occurs. Fluids that have low electrical conductivity (below 50 picosiemens per meter), are called accumulators. Fluids having conductivity above 50 pS/m are called non-accumulators. In non-accumulators, charges recombine as fast as they are separated and hence electrostatic charge accumulation is not significant. In the petrochemical industry, 50 pS/m is the recommended minimum value of electrical conductivity for adequate removal of charge from a fluid.

Kerosines may have conductivity ranging from less than 1 picosiemens per meter to 20 pS/m. For comparison, deionized water has a conductivity of about 10,000,000 pS/m or 10 µS/m.

Transformer oil is part of the electrical insulation system of large power transformers and other electrical apparatus. Re-filling of large apparatus requires precautions against electrostatic charging of the fluid, which may damage sensitive transformer insulation.

An important concept for insulating fluids is the static relaxation time. This is similar to the time constant τ (tau) within an RC circuit. For insulating materials, it is the ratio of the static dielectric constant divided by the electrical conductivity of the material. For hydrocarbon fluids, this is sometimes approximated by dividing the number 18 by the electrical conductivity of the fluid. Thus a fluid that has an electrical conductivity of 1 pS/m has an estimated relaxation time of about 18 seconds. The excess charge in a fluid dissipates almost completely after four to five times the relaxation time, or 90 seconds for the fluid in the above example.

Charge generation increases at higher fluid velocities and larger pipe diameters, becoming quite significant in pipes 8 inches (200 mm) or larger. Static charge generation in these systems is best controlled by limiting fluid velocity. The British standard BS PD CLC/TR 50404:2003 (formerly BS-5958-Part 2) Code of Practice for Control of Undesirable Static Electricity prescribes pipe flow velocity limits. Because water content has a large impact on the fluids dielectric constant, the recommended velocity for hydrocarbon fluids containing water should be limited to 1 meter per second.

Bonding and earthing are the usual ways charge buildup can be prevented. For fluids with electrical conductivity below 10 pS/m, bonding and earthing are not adequate for charge dissipation, and anti-static additives may be required.[citation needed]

Fueling operations

The flowing movement of flammable liquids like gasoline inside a pipe can build up static electricity. Non-polar liquids such as gasoline, toluene, xylene, diesel, kerosene and light crude oils exhibit significant ability for charge accumulation and charge retention during high velocity flow. Electrostatic discharges can ignite the fuel vapor. When the electrostatic discharge energy is high enough, it can ignite a fuel vapor and air mixture. Different fuels have different flammable limits and require different levels of electrostatic discharge energy to ignite.

Electrostatic discharge while fueling with gasoline is a present danger at gas stations. Fires have also been started at airports while refueling aircraft with kerosene. New grounding technologies, the use of conducting materials, and the addition of anti-static additives help to prevent or safely dissipate the buildup of static electricity.

The flowing movement of gases in pipes alone creates little, if any, static electricity. It is envisaged that a charge generation mechanism only occurs when solid particles or liquid droplets are carried in the gas stream.

In space exploration

Due to the extremely low humidity in extraterrestrial environments, very large static charges can accumulate, causing a major hazard for the complex electronics used in space exploration vehicles. Static electricity is thought to be a particular hazard for astronauts on planned missions to the Moon and Mars. Walking over the extremely dry terrain could cause them to accumulate a significant amount of charge; reaching out to open the airlock on their return could cause a large static discharge, potentially damaging sensitive electronics.

Ozone cracking

Ozone cracking in natural rubber tubing

A static discharge in the presence of air or oxygen can create ozone. Ozone can degrade rubber parts. Many elastomers are sensitive to ozone cracking. Exposure to ozone creates deep penetrative cracks in critical components like gaskets and O-rings. Fuel lines are also susceptible to the problem unless preventive action is taken. Preventive measures include adding anti-ozonants to the rubber mix, or using an ozone-resistant elastomer. Fires from cracked fuel lines have been a problem on vehicles, especially in the engine compartments where ozone can be produced by electrical equipment.

The energy released in a static electricity discharge may vary over a wide range. The energy in joules can be calculated from the capacitance (C) of the object and the static potential V in volts (V) by the formula E = ½CV2. One experimenter estimates the capacitance of the human body as high as 400 picofarads, and a charge of 50,000 volts, discharged e.g. during touching a charged car, creating a spark with energy of 500 millijoules. Another estimate is 100–300 pF and 20,000 volts, producing a maximum energy of 60 mJ. IEC 479-2:1987 states that a discharge with energy greater than 5000 mJ is a direct serious risk to human health. IEC 60065 states that consumer products cannot discharge more than 350 mJ into a person.

The maximal potential is limited to about 35–40 kV, due to corona discharge dissipating the charge at higher potentials. Potentials below 3000 volts are not typically detectable by humans. Maximal potential commonly achieved on human body range between 1 and 10 kV, though in optimal conditions as high as 20–25 kV can be reached. Low relative humidity increases the charge buildup; walking 20 feet (6 m) on vinyl floor at 15% relative humidity causes buildup of voltage up to 12 kV, while at 80% humidity the voltage is only 1.5 kV.

As little as 0.2 millijoules may present an ignition hazard; such low spark energy is often below the threshold of human visual and auditory perception.

Typical ignition energies are:

  • 0.017 mJ for hydrogen,
  • 0.2–2 mJ for hydrocarbon vapors,
  • 1–50 mJ for fine flammable dust,
  • 40–1000 mJ for coarse flammable dust.

The energy needed to damage most electronic devices[specify] is between 2 and 1000 nanojoules.

A relatively small energy, often as little as 0.2–2 millijoules, is needed to ignite a flammable mixture of a fuel and air. For the common industrial hydrocarbon gases and solvents, the minimum ignition energy required for ignition of vapor–air mixture is lowest for the vapor concentration roughly in the middle between the lower explosive limit and the upper explosive limit, and rapidly increases as the concentration deviates from this optimum to either side. Aerosols of flammable liquids may be ignited well below their flash point. Generally, liquid aerosols with particle sizes below 10 micrometers behave like vapors, particle sizes above 40 micrometers behave more like flammable dusts. Typical minimal flammable concentrations of aerosols lay between 15 and 50 g/m3. Similarly, presence of foam on the surface of a flammable liquid significantly increases ignitability. Aerosol of flammable dust can be ignited as well, resulting in a dust explosion; the lower explosive limit usually lies between 50 and 1000 g/m3; finer dusts tend to be more explosive and requiring less spark energy to set off. Simultaneous presence of flammable vapors and flammable dust can significantly decrease the ignition energy; a mere 1 vol.% of propane in air can reduce the required ignition energy of dust by 100 times. Higher than normal oxygen content in atmosphere also significantly lowers the ignition energy.

There are five types of electrical discharges:

  • Spark, responsible for the majority of industrial fires and explosions where static electricity is involved. Sparks occur between objects at different electric potentials. Good grounding of all parts of the equipment and precautions against charge buildups on equipment and personnel are used as prevention measures.
  • Brush discharge occurs from a nonconductive charged surface or highly charged nonconductive liquids. The energy is limited to roughly 4 millijoules. To be hazardous, the voltage involved must be above about 20 kilovolts, the surface polarity must be negative, a flammable atmosphere must be present at the point of discharge, and the discharge energy must be sufficient for ignition. Further, because surfaces have a maximal charge density, an area of at least 100 cm2 has to be involved. This is not considered to be a hazard for dust clouds.
  • Propagating brush discharge is high in energy and dangerous. Occurs when an insulating surface of up to 8 mm thick (e.g. a teflon or glass lining of a grounded metal pipe or a reactor) is subjected to a large charge buildup between the opposite surfaces, acting as a large-area capacitor.
  • Cone discharge, also called bulking brush discharge, occurs over surfaces of charged powders with resistance above 1010 ohms, or also deep through the powder mass. Cone discharges aren't usually observed in dust volumes below 1 m3. The energy involved depends on the grain size of the powder and the charge magnitude, and can reach up to 20 mJ. Larger dust volumes produce higher energies.
  • Corona discharge, considered non-hazardous.
  1. Dhogal (1986). Basic Electrical Engineering, Volume 1. Tata McGraw-Hill. p. 41. ISBN 978-0-07-451586-0.
  2. "Ionizers and Static Eliminators". GlobalSpec. 2009. Archived from the original on 2009-02-10. Retrieved2009-04-13.
  3. "Fabric Softener and Static". Ask a Scientist, General Science Archive. US Department of Energy. 2003. Retrieved2009-04-13.
  4. Antistatic Bags for Parts. PC Chop Shop. John Wiley and Sons. 2004. ISBN 978-0-7821-4360-7. Retrieved2009-04-13.
  5. Antistatic Wrist Strap. PC Chop Shop. John Wiley and Sons. 2004. ISBN 978-0-7821-4360-7. Retrieved2009-04-13.
  6. "Safetoes: Safety Footwear". Safetoes. Trojan Tooling. 2004. Retrieved2009-04-13.
  7. Carlos Hernando Díaz, Sung-Mo Kang, Charvaka Duvvury, Modeling of electrical overstress in integrated circuits Springer, 1995 ISBN 0-7923-9505-0 page 5
  8. J. J. Lowke (1992). "Theory of electrical breakdown in air". Journal of Physics D: Applied Physics. 25 (2): 202–210. Bibcode:1992JPhD...25..202L. doi:10.1088/0022-3727/25/2/012.
  9. Kassebaum, J. H. & Kocken, R. A. (1995). "Controlling Static Electricity in Hazardous (Classified) Locations". Petroleum and Chemical Industry 42nd Annual Conference Papers: 105–113. doi:10.1109/PCICON.1995.523945. ISBN 0-7803-2909-0. S2CID 110221915.
  10. Wagner, John P.; Clavijo, Fernando Rangel Electrostatic charge generation during impeller mixing of used transformer oil Department of Nuclear Engineering, Safety Engineering and Industrial Hygiene Program, Texas A&M University, College Station, online 21 August 2000; accessed Jan 2009 doi:10.1016/S0304-3886(00)00019-X
  11. Downie, Neil A., Exploding Disk Cannons, Slimemobiles and 32 Other Projects for Saturday Science (Johns Hopkins University Press (2006), ISBN 978-0-8018-8506-8, chapter 33, pages 259-266 "Electric Sand"
  12. Hearn, Graham (1998). "Static electricity: concern in the pharmaceutical industry?". Pharmaceutical Science & Technology Today. 1 (7): 286–287. doi:10.1016/S1461-5347(98)00078-9.
  13. Storage Tank Explosion and Fire in Glenpool, Oklahoma April 7, 2003 National Transportation Safety Board
  14. Static Spark Ignites Flammable Liquid during Portable Tank Filling Operation Archived 2009-01-17 at the Wayback Machine Chemical Safety Board October 29, 2007
  15. Egorov, V.N. (1970). "Electrification of petroleum fuels"(PDF). Khimiya I Tekhnologiya Topliv I Masel. 4: 20–25.[dead link]
  16. Touchard, Gérard (2001). "Flow electrification of liquids". Journal of Electrostatics. 51–52: 440–447. doi:10.1016/S0304-3886(01)00081-X.
  17. Chevron Corporation Aviation Fuels Technical Review Archived 2009-03-19 at the Wayback Machine 2006, accessed Dec 2008
  18. Hearn, Graham Static electricity – guidance for Plant Engineers – Wolfson Electrostatics University of Southampton 2002; accessed Dec 2008
  19. "CarCare – Auto Clinic" Popular Mechanics, April 2003, p. 163.
  20. Kinzing, G.E., 'Electrostatic Effects in Pneumatic Transport: Assessment, Magnitudes and Future Direction', Journal Pipelines, 4, 95–102, 1984
  21. "NASA – Crackling Planets". Retrieved2021-02-23.
  22. Nomograms for capacitive electrostatic discharge risk assessment. Ece.rochester.edu. Retrieved on 2010-02-08.
  23. "High voltage safety: VandeGraaff Electrostatic Generator". amasci.com. Retrieved2010-01-27.
  24. Index. Wolfsonelectrostatics.com. Retrieved on 2011-03-17.
  25. M. A. Kelly, G. E. Servais, T. V. Pfaffenbach An Investigation of Human Body Electrostatic Discharge, ISTFA ’93: The 19th International Symposium for Testing & Failure Analysis, Los Angeles, California, USA/15–19 November 1993.
  26. "ESD Terms". eed.gsfc.nasa.gov. Archived from the original on 2004-09-17. Retrieved2010-01-27.
  27. Static Electricity Guidance for Plant Engineers. Graham Hearn – Wolfson Electrostatics, University of Southampton.

Static electricity Article Talk Language Watch Edit For the science of static charges see Electrostatics Static electricity is an imbalance of electric charges within or on the surface of a material or between materials The charge remains until it is able to move away by means of an electric current or electrical discharge Static electricity is named in contrast with current electricity where the electric charge flows through an electrical conductor or space and transmits energy 1 Contact with the slide has left this child s hair positively charged so that the individual hairs repel one another The hair can also be attracted to the negatively charged slide surface A static electric charge can be created whenever two surfaces contact and have worn and separated and at least one of the surfaces has a high resistance to electric current and is therefore an electrical insulator The effects of static electricity are familiar to most people because people can feel hear and even see the spark as the excess charge is neutralized when brought close to a large electrical conductor for example a path to ground or a region with an excess charge of the opposite polarity positive or negative The familiar phenomenon of a static shock more specifically an electrostatic discharge is caused by the neutralization of a charge Contents 1 Causes 2 Removal and prevention 3 Static discharge 3 1 Lightning 3 2 Electronic components 3 3 Static build up in flowing flammable and ignitable materials 3 3 1 Fueling operations 3 4 In space exploration 3 5 Ozone cracking 4 Energies involved 5 See also 6 References 7 External linksCauses EditMaterials are made of atoms that are normally electrically neutral because they contain equal numbers of positive charges protons in their nuclei and negative charges electrons in shells surrounding the nucleus The phenomenon of static electricity requires a separation of positive and negative charges When two materials are in contact electrons may move from one material to the other which leaves an excess of positive charge on one material and an equal negative charge on the other When the materials are separated they retain this charge imbalance Contact induced charge separationMain article Triboelectric effect Styrofoam peanuts clinging to a cat s fur due to static electricity This effect is also the cause of static cling in clothes Electrons can be exchanged between materials on contact materials with weakly bound electrons tend to lose them while materials with sparsely filled outer shells tend to gain them This is known as the triboelectric effect and results in one material becoming positively charged and the other negatively charged The polarity and strength of the charge on a material once they are separated depends on their relative positions in the triboelectric series The triboelectric effect is the main cause of static electricity as observed in everyday life and in common high school science demonstrations involving rubbing different materials together e g fur against an acrylic rod Contact induced charge separation causes your hair to stand up and causes static cling for example a balloon rubbed against the hair becomes negatively charged when near a wall the charged balloon is attracted to positively charged particles in the wall and can cling to it appearing to be suspended against gravity Pressure induced charge separation Main article Piezoelectric effect Applied mechanical stress generates a separation of charge in certain types of crystals and ceramics molecules Heat induced charge separation Main article Pyroelectric effect Heating generates a separation of charge in the atoms or molecules of certain materials All pyroelectric materials are also piezoelectric The atomic or molecular properties of heat and pressure response are closely related Charge induced charge separation Main article Electrostatic induction A charged object brought close to an electrically neutral object causes a separation of charge within the neutral object Charges of the same polarity are repelled and charges of the opposite polarity are attracted As the force due to the interaction of electric charges falls off rapidly with increasing distance the effect of the closer opposite polarity charges is greater and the two objects feel a force of attraction The effect is most pronounced when the neutral object is an electrical conductor as the charges are more free to move around Careful grounding of part of an object with a charge induced charge separation can permanently add or remove electrons leaving the object with a global permanent charge This process is integral to the workings of the Van de Graaff generator a device commonly used to demonstrate the effects of static electricity Removal and prevention EditMain articles Antistatic agent and Antistatic device A network card inside an antistatic bag An antistatic wrist strap with crocodile clip Removing or preventing a buildup of static charge can be as simple as opening a window or using a humidifier to increase the moisture content of the air making the atmosphere more conductive Air ionizers can perform the same task 2 Items that are particularly sensitive to static discharge may be treated with the application of an antistatic agent which adds a conducting surface layer that ensures any excess charge is evenly distributed Fabric softeners and dryer sheets used in washing machines and clothes dryers are an example of an antistatic agent used to prevent and remove static cling 3 Many semiconductor devices used in electronics are particularly sensitive to static discharge Conductive antistatic bags are commonly used to protect such components People who work on circuits that contain these devices often ground themselves with a conductive antistatic strap 4 5 In the industrial settings such as paint or flour plants as well as in hospitals antistatic safety boots are sometimes used to prevent a buildup of static charge due to contact with the floor These shoes have soles with good conductivity Anti static shoes should not be confused with insulating shoes which provide exactly the opposite benefit some protection against serious electric shocks from the mains voltage 6 Static discharge EditMain articles Electrostatic discharge and Corona discharge This section needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Static electricity news newspapers books scholar JSTOR September 2010 Learn how and when to remove this template message The spark associated with static electricity is caused by electrostatic discharge or simply static discharge as excess charge is neutralized by a flow of charges from or to the surroundings The feeling of an electric shock is caused by the stimulation of nerves as the neutralizing current flows through the human body The energy stored as static electricity on an object varies depending on the size of the object and its capacitance the voltage to which it is charged and the dielectric constant of the surrounding medium For modelling the effect of static discharge on sensitive electronic devices a human being is represented as a capacitor of 100 picofarads charged to a voltage of 4 000 to 35 000 volts When touching an object this energy is discharged in less than a microsecond 7 While the total energy is small on the order of millijoules it can still damage sensitive electronic devices Larger objects will store more energy which may be directly hazardous to human contact or which may give a spark that can ignite flammable gas or dust Lightning Edit Natural static discharge Small hairs standing up after a thunderstorm as a result of the left over weak static electricity Main article Lightning Lightning is a dramatic natural example of static discharge While the details are unclear and remain a subject of debate the initial charge separation is thought to be associated with contact between ice particles within storm clouds In general significant charge accumulations can only persist in regions of low electrical conductivity very few charges free to move in the surroundings hence the flow of neutralizing charges often results from neutral atoms and molecules in the air being torn apart to form separate positive and negative charges which travel in opposite directions as an electric current neutralizing the original accumulation of charge The static charge in air typically breaks down in this way at around 10 000 volts per centimeter 10 kV cm depending on humidity 8 The discharge superheats the surrounding air causing the bright flash and produces a shock wave causing the clicking sound The lightning bolt is simply a scaled up version of the sparks seen in more domestic occurrences of static discharge The flash occurs because the air in the discharge channel is heated to such a high temperature that it emits light by incandescence The clap of thunder is the result of the shock wave created as the superheated air expands explosively Electronic components Edit Many semiconductor devices used in electronics are very sensitive to the presence of static electricity and can be damaged by a static discharge The use of an antistatic strap is mandatory for researchers manipulating nanodevices Further precautions can be taken by taking off shoes with thick rubber soles and permanently staying with a metallic ground Static build up in flowing flammable and ignitable materials Edit Static electricity is a major hazard when refueling an aircraft Discharge of static electricity can create severe hazards in those industries dealing with flammable substances where a small electrical spark might ignite explosive mixtures 9 The flowing movement of finely powdered substances or low conductivity fluids in pipes or through mechanical agitation can build up static electricity 10 The flow of granules of material like sand down a plastic chute can transfer charge which can be easily measured using a multimeter connected to metal foil lining the chute at intervals and can be roughly proportional to particulate flow 11 Dust clouds of finely powdered substances can become combustible or explosive When there is a static discharge in a dust or vapor cloud explosions have occurred Among the major industrial incidents that have occurred are a grain silo in southwest France a paint plant in Thailand a factory making fiberglass moldings in Canada a storage tank explosion in Glenpool Oklahoma in 2003 and a portable tank filling operation and a tank farm in Des Moines Iowa and Valley Center Kansas in 2007 12 13 14 The ability of a fluid to retain an electrostatic charge depends on its electrical conductivity When low conductivity fluids flow through pipelines or are mechanically agitated contact induced charge separation called flow electrification occurs 15 16 Fluids that have low electrical conductivity below 50 picosiemens per meter are called accumulators Fluids having conductivity above 50 pS m are called non accumulators In non accumulators charges recombine as fast as they are separated and hence electrostatic charge accumulation is not significant In the petrochemical industry 50 pS m is the recommended minimum value of electrical conductivity for adequate removal of charge from a fluid Kerosines may have conductivity ranging from less than 1 picosiemens per meter to 20 pS m For comparison deionized water has a conductivity of about 10 000 000 pS m or 10 µS m 17 Transformer oil is part of the electrical insulation system of large power transformers and other electrical apparatus Re filling of large apparatus requires precautions against electrostatic charging of the fluid which may damage sensitive transformer insulation An important concept for insulating fluids is the static relaxation time This is similar to the time constant t tau within an RC circuit For insulating materials it is the ratio of the static dielectric constant divided by the electrical conductivity of the material For hydrocarbon fluids this is sometimes approximated by dividing the number 18 by the electrical conductivity of the fluid Thus a fluid that has an electrical conductivity of 1 pS m has an estimated relaxation time of about 18 seconds The excess charge in a fluid dissipates almost completely after four to five times the relaxation time or 90 seconds for the fluid in the above example Charge generation increases at higher fluid velocities and larger pipe diameters becoming quite significant in pipes 8 inches 200 mm or larger Static charge generation in these systems is best controlled by limiting fluid velocity The British standard BS PD CLC TR 50404 2003 formerly BS 5958 Part 2 Code of Practice for Control of Undesirable Static Electricity prescribes pipe flow velocity limits Because water content has a large impact on the fluids dielectric constant the recommended velocity for hydrocarbon fluids containing water should be limited to 1 meter per second Bonding and earthing are the usual ways charge buildup can be prevented For fluids with electrical conductivity below 10 pS m bonding and earthing are not adequate for charge dissipation and anti static additives may be required citation needed Fueling operations Edit The flowing movement of flammable liquids like gasoline inside a pipe can build up static electricity Non polar liquids such as gasoline toluene xylene diesel kerosene and light crude oils exhibit significant ability for charge accumulation and charge retention during high velocity flow Electrostatic discharges can ignite the fuel vapor 18 When the electrostatic discharge energy is high enough it can ignite a fuel vapor and air mixture Different fuels have different flammable limits and require different levels of electrostatic discharge energy to ignite Electrostatic discharge while fueling with gasoline is a present danger at gas stations 19 Fires have also been started at airports while refueling aircraft with kerosene New grounding technologies the use of conducting materials and the addition of anti static additives help to prevent or safely dissipate the buildup of static electricity The flowing movement of gases in pipes alone creates little if any static electricity 20 It is envisaged that a charge generation mechanism only occurs when solid particles or liquid droplets are carried in the gas stream In space exploration Edit Due to the extremely low humidity in extraterrestrial environments very large static charges can accumulate causing a major hazard for the complex electronics used in space exploration vehicles Static electricity is thought to be a particular hazard for astronauts on planned missions to the Moon and Mars Walking over the extremely dry terrain could cause them to accumulate a significant amount of charge reaching out to open the airlock on their return could cause a large static discharge potentially damaging sensitive electronics 21 Ozone cracking Edit Ozone cracking in natural rubber tubing A static discharge in the presence of air or oxygen can create ozone Ozone can degrade rubber parts Many elastomers are sensitive to ozone cracking Exposure to ozone creates deep penetrative cracks in critical components like gaskets and O rings Fuel lines are also susceptible to the problem unless preventive action is taken Preventive measures include adding anti ozonants to the rubber mix or using an ozone resistant elastomer Fires from cracked fuel lines have been a problem on vehicles especially in the engine compartments where ozone can be produced by electrical equipment Energies involved EditThe energy released in a static electricity discharge may vary over a wide range The energy in joules can be calculated from the capacitance C of the object and the static potential V in volts V by the formula E CV2 22 One experimenter estimates the capacitance of the human body as high as 400 picofarads and a charge of 50 000 volts discharged e g during touching a charged car creating a spark with energy of 500 millijoules 23 Another estimate is 100 300 pF and 20 000 volts producing a maximum energy of 60 mJ 24 IEC 479 2 1987 states that a discharge with energy greater than 5000 mJ is a direct serious risk to human health IEC 60065 states that consumer products cannot discharge more than 350 mJ into a person The maximal potential is limited to about 35 40 kV due to corona discharge dissipating the charge at higher potentials Potentials below 3000 volts are not typically detectable by humans Maximal potential commonly achieved on human body range between 1 and 10 kV though in optimal conditions as high as 20 25 kV can be reached Low relative humidity increases the charge buildup walking 20 feet 6 m on vinyl floor at 15 relative humidity causes buildup of voltage up to 12 kV while at 80 humidity the voltage is only 1 5 kV 25 As little as 0 2 millijoules may present an ignition hazard such low spark energy is often below the threshold of human visual and auditory perception Typical ignition energies are 0 017 mJ for hydrogen 0 2 2 mJ for hydrocarbon vapors 1 50 mJ for fine flammable dust 40 1000 mJ for coarse flammable dust The energy needed to damage most electronic devices specify is between 2 and 1000 nanojoules 26 A relatively small energy often as little as 0 2 2 millijoules is needed to ignite a flammable mixture of a fuel and air For the common industrial hydrocarbon gases and solvents the minimum ignition energy required for ignition of vapor air mixture is lowest for the vapor concentration roughly in the middle between the lower explosive limit and the upper explosive limit and rapidly increases as the concentration deviates from this optimum to either side Aerosols of flammable liquids may be ignited well below their flash point Generally liquid aerosols with particle sizes below 10 micrometers behave like vapors particle sizes above 40 micrometers behave more like flammable dusts Typical minimal flammable concentrations of aerosols lay between 15 and 50 g m3 Similarly presence of foam on the surface of a flammable liquid significantly increases ignitability Aerosol of flammable dust can be ignited as well resulting in a dust explosion the lower explosive limit usually lies between 50 and 1000 g m3 finer dusts tend to be more explosive and requiring less spark energy to set off Simultaneous presence of flammable vapors and flammable dust can significantly decrease the ignition energy a mere 1 vol of propane in air can reduce the required ignition energy of dust by 100 times Higher than normal oxygen content in atmosphere also significantly lowers the ignition energy 27 There are five types of electrical discharges Spark responsible for the majority of industrial fires and explosions where static electricity is involved Sparks occur between objects at different electric potentials Good grounding of all parts of the equipment and precautions against charge buildups on equipment and personnel are used as prevention measures Brush discharge occurs from a nonconductive charged surface or highly charged nonconductive liquids The energy is limited to roughly 4 millijoules To be hazardous the voltage involved must be above about 20 kilovolts the surface polarity must be negative a flammable atmosphere must be present at the point of discharge and the discharge energy must be sufficient for ignition Further because surfaces have a maximal charge density an area of at least 100 cm2 has to be involved This is not considered to be a hazard for dust clouds Propagating brush discharge is high in energy and dangerous Occurs when an insulating surface of up to 8 mm thick e g a teflon or glass lining of a grounded metal pipe or a reactor is subjected to a large charge buildup between the opposite surfaces acting as a large area capacitor Cone discharge also called bulking brush discharge occurs over surfaces of charged powders with resistance above 1010 ohms or also deep through the powder mass Cone discharges aren t usually observed in dust volumes below 1 m3 The energy involved depends on the grain size of the powder and the charge magnitude and can reach up to 20 mJ Larger dust volumes produce higher energies Corona discharge considered non hazardous See also EditElectrical charge Electrostatic discharge Electrostatic generator Electrostatics Triboelectrification Van de Graaff generator Wimshurst machineReferences Edit Dhogal 1986 Basic Electrical Engineering Volume 1 Tata McGraw Hill p 41 ISBN 978 0 07 451586 0 Ionizers and Static Eliminators GlobalSpec 2009 Archived from the original on 2009 02 10 Retrieved 2009 04 13 Fabric Softener and Static Ask a Scientist General Science Archive US Department of Energy 2003 Retrieved 2009 04 13 Antistatic Bags for Parts PC Chop Shop John Wiley and Sons 2004 ISBN 978 0 7821 4360 7 Retrieved 2009 04 13 Antistatic Wrist Strap PC Chop Shop John Wiley and Sons 2004 ISBN 978 0 7821 4360 7 Retrieved 2009 04 13 Safetoes Safety Footwear Safetoes Trojan Tooling 2004 Retrieved 2009 04 13 Carlos Hernando Diaz Sung Mo Kang Charvaka Duvvury Modeling of electrical overstress in integrated circuits Springer 1995 ISBN 0 7923 9505 0 page 5 J J Lowke 1992 Theory of electrical breakdown in air Journal of Physics D Applied Physics 25 2 202 210 Bibcode 1992JPhD 25 202L doi 10 1088 0022 3727 25 2 012 Kassebaum J H amp Kocken R A 1995 Controlling Static Electricity in Hazardous Classified Locations Petroleum and Chemical Industry 42nd Annual Conference Papers 105 113 doi 10 1109 PCICON 1995 523945 ISBN 0 7803 2909 0 S2CID 110221915 Wagner John P Clavijo Fernando Rangel Electrostatic charge generation during impeller mixing of used transformer oil Department of Nuclear Engineering Safety Engineering and Industrial Hygiene Program Texas A amp M University College Station online 21 August 2000 accessed Jan 2009 doi 10 1016 S0304 3886 00 00019 X Downie Neil A Exploding Disk Cannons Slimemobiles and 32 Other Projects for Saturday Science Johns Hopkins University Press 2006 ISBN 978 0 8018 8506 8 chapter 33 pages 259 266 Electric Sand Hearn Graham 1998 Static electricity concern in the pharmaceutical industry Pharmaceutical Science amp Technology Today 1 7 286 287 doi 10 1016 S1461 5347 98 00078 9 Storage Tank Explosion and Fire in Glenpool Oklahoma April 7 2003 National Transportation Safety Board Static Spark Ignites Flammable Liquid during Portable Tank Filling Operation Archived 2009 01 17 at the Wayback Machine Chemical Safety Board October 29 2007 Egorov V N 1970 Electrification of petroleum fuels PDF Khimiya I Tekhnologiya Topliv I Masel 4 20 25 dead link Touchard Gerard 2001 Flow electrification of liquids Journal of Electrostatics 51 52 440 447 doi 10 1016 S0304 3886 01 00081 X Chevron Corporation Aviation Fuels Technical Review Archived 2009 03 19 at the Wayback Machine 2006 accessed Dec 2008 Hearn Graham Static electricity guidance for Plant Engineers Wolfson Electrostatics University of Southampton 2002 accessed Dec 2008 CarCare Auto Clinic Popular Mechanics April 2003 p 163 Kinzing G E Electrostatic Effects in Pneumatic Transport Assessment Magnitudes and Future Direction Journal Pipelines 4 95 102 1984 NASA Crackling Planets Retrieved 2021 02 23 Nomograms for capacitive electrostatic discharge risk assessment Ece rochester edu Retrieved on 2010 02 08 High voltage safety VandeGraaff Electrostatic Generator amasci com Retrieved 2010 01 27 Index Wolfsonelectrostatics com Retrieved on 2011 03 17 M A Kelly G E Servais T V Pfaffenbach An Investigation of Human Body Electrostatic Discharge ISTFA 93 The 19th International Symposium for Testing amp Failure Analysis Los Angeles California USA 15 19 November 1993 ESD Terms eed gsfc nasa gov Archived from the original on 2004 09 17 Retrieved 2010 01 27 Static Electricity Guidance for Plant Engineers Graham Hearn Wolfson Electrostatics University of Southampton External links Edit Media related to Static electricity at Wikimedia Commons The dictionary definition of static electricity at Wiktionary Retrieved from https en wikipedia org w index php title Static electricity amp oldid 1069643678, wikipedia, wiki, book,

books

, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.