168 relations: Abampere, Abcoulomb, Abhenry, Abmho, Abohm, Absorbed dose, Abvolt, Acceleration, Air Canada, Albert Einstein, Amount of substance, Ampere, Ancient Greek, Angle, Area, Astronomical unit, Atmosphere (unit), Atomic physics, Ångström, Bar (unit), Barye, Base unit (measurement), Becquerel, Binary prefix, Biot number, Boeing 767, British Science Association, Calorie, Candela, Candlepower, Capacitance, Catalysis, Celsius, Centimetre, Centimetre–gram–second system of units, Coherence (units of measurement), Coulomb, Curie, Day, Deca-, Decimal, Degree (angle), Dyne, Electric charge, Electric current, Electrical resistance and conductance, Electromechanics, Electron rest mass, Electronvolt, Energy, ..., Enzyme unit, Equivalent dose, Erg, Farad, Florida, Force, French Revolution, Frequency, Gal (unit), Gauss (unit), Gimli Glider, Giovanni Giorgi, Grain (unit), Gram, Gravitational metric system, Gray (unit), Hectare, Henry (unit), Hertz, History of measurement, Horsepower, Hour, Illuminance, Imperial units, Inductance, Institute of Electrical and Electronics Engineers, International Bureau of Weights and Measures, International Electrotechnical Commission, International Organization of Legal Metrology, International System of Units, ISO 31, ISO/IEC 80000, Isotopes of krypton, Joule, Katal, Kelvin, Kilogram, Kilogram-force, Kilometre, Knot (unit), Latin, Length, Litre, Lumen (unit), Luminous flux, Luminous intensity, Lux, Magnetic field, Magnetic flux, Maiquetía, Mars Climate Orbiter, Mass, Mass–energy equivalence, Maxwell (unit), Mechanics, Metre, Metre–tonne–second system of units, Metric prefix, Metrology, Miami, Millimetre, Minute, Minute and second of arc, Mole (unit), NASA, National Transportation Safety Board, Nautical mile, Navigation, Newton (unit), Oersted, Ohm, Oxford, Oxford University Press, Pascal (unit), Phenobarbital, Phot, Pièze, Poise (unit), Pound (force), Power (physics), Pressure, Proper noun, Rad (unit), Radioactive decay, Realisation (metrology), Roentgen (unit), Roentgen equivalent man, Second, SI derived unit, Siemens (unit), Sievert, Slug (unit), Solar mass, Soviet Union, Square kilometre, Square metre, Standard gravity, Statcoulomb, Statmho, Statvolt, Sthène, Stilb (unit), System of measurement, Temperature, Tesla (unit), Thermal energy, Time, Tonne, Unified atomic mass unit, Unit of measurement, United States customary units, Venezuela, Viscosity, Volt, Voltage, Volume, Watt, Weber (unit). Expand index (118 more) » « Shrink index
The abampere (abA), also called the biot (Bi) after Jean-Baptiste Biot, is the basic electromagnetic unit of electric current in the emu-cgs system of units (electromagnetic cgs).
The abcoulomb (abC or aC) or electromagnetic unit of charge (emu of charge) is the basic physical unit of electric charge in the cgs-emu system of units.
Abhenry is the CGS ''(centimeter-gram-second)'' electromagnetic unit of inductance, equal to one billionth of a henry.
Abmho or absiemens is a unit of electrical conductance in the centimetre gram second (emu-cgs) system of units.
The abohm is the basic unit of electrical resistance in the emu-cgs ''(centimeter-gram-second)'' system of units (emu stands for "electromagnetic units").
Absorbed dose is a measure of the energy deposited in a medium by ionizing radiation.
The abvolt (abV) is one option for the unit of potential difference in the EMU-CGS system of units, and is equal to 10−8 volts in the SI system.
In physics, acceleration is the rate of change of velocity of an object with respect to time.
Air Canada is the flag carrier and largest airline of Canada by fleet size and passengers carried.
Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist who developed the theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).
Amount of substance (symbol for the quantity is 'n') is a standard-defined quantity that measures the size of an ensemble of elementary entities, such as atoms, molecules, electrons, and other particles.
The ampere (symbol: A), often shortened to "amp",SI supports only the use of symbols and deprecates the use of abbreviations for units.
The Ancient Greek language includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD.
In plane geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.
Area is the quantity that expresses the extent of a two-dimensional figure or shape, or planar lamina, in the plane.
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
The standard atmosphere (symbol: atm) is a unit of pressure defined as.
Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus.
The ångström or angstrom is a unit of length equal to (one ten-billionth of a metre) or 0.1 nanometre.
The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI).
The barye (symbol: Ba), or sometimes barad, barrie, bary, baryd, baryed, or barie, is the centimetre–gram–second (CGS) unit of pressure.
A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity.
The becquerel (symbol: Bq) is the SI derived unit of radioactivity.
A binary prefix is a unit prefix for multiples of units in data processing, data transmission, and digital information, notably the bit and the byte, to indicate multiplication by a power of 2.
The Biot number (Bi) is a dimensionless quantity used in heat transfer calculations.
The Boeing 767 is a mid- to large-size, mid- to long-range, wide-body twin-engine jet airliner built by Boeing Commercial Airplanes.
The British Science Association (BSA) is a charity and learned society founded in 1831 to aid in the promotion and development of science.
A calorie is a unit of energy.
The candela (or; symbol: cd) is the base unit of luminous intensity in the International System of Units (SI); that is, luminous power per unit solid angle emitted by a point light source in a particular direction.
Candlepower (abbreviated as cp or CP) is an obsolete unit expressing luminous intensity, equal to 0.981 candelas.
Capacitance is the ratio of the change in an electric charge in a system to the corresponding change in its electric potential.
Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalysthttp://goldbook.iupac.org/C00876.html, which is not consumed in the catalyzed reaction and can continue to act repeatedly.
The Celsius scale, previously known as the centigrade scale, is a temperature scale used by the International System of Units (SI).
A centimetre (international spelling as used by the International Bureau of Weights and Measures; symbol cm) or centimeter (American spelling) is a unit of length in the metric system, equal to one hundredth of a metre, centi being the SI prefix for a factor of.
The centimetre–gram–second system of units (abbreviated CGS or cgs) is a variant of the metric system based on the centimetre as the unit of length, the gram as the unit of mass, and the second as the unit of time.
A coherent system of units is based on a system of quantities in such a way that the equations between the numerical values expressed in coherent units have exactly the same form, including numerical factors, as the corresponding equations between the quantities.
The coulomb (symbol: C) is the International System of Units (SI) unit of electric charge.
The curie (symbol Ci) is a non-SI unit of radioactivity originally defined in 1910.
A day, a unit of time, is approximately the period of time during which the Earth completes one rotation with respect to the Sun (solar day).
Deca- or deka-, 1995, NIST Special Publication 811 (symbol da) is a decimal unit prefix in the metric system, denoting a factor of ten.
The decimal numeral system (also called base-ten positional numeral system, and occasionally called denary) is the standard system for denoting integer and non-integer numbers.
A degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by ° (the degree symbol), is a measurement of a plane angle, defined so that a full rotation is 360 degrees.
The dyne (symbol dyn, from Greek δύναμις, dynamis, meaning power, force) is a derived unit of force specified in the centimetre–gram–second (CGS) system of units, a predecessor of the modern SI.
Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.
An electric current is a flow of electric charge.
The electrical resistance of an electrical conductor is a measure of the difficulty to pass an electric current through that conductor.
In engineering, electromechanics combines processes and procedures drawn from electrical engineering and mechanical engineering.
The electron rest mass (symbol) is the mass of a stationary electron.
In physics, the electronvolt (symbol eV, also written electron-volt and electron volt) is a unit of energy equal to approximately joules (symbol J).
In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.
The enzyme unit (symbol U or sometimes EU) is a unit for the amount of a particular enzyme.
Equivalent dose is a dose quantity H representing the stochastic health effects of low levels of ionizing radiation on the human body.
The erg is a unit of energy and work equal to 10−7 joules.
The farad (symbol: F) is the SI derived unit of electrical capacitance, the ability of a body to store an electrical charge.
Florida (Spanish for "land of flowers") is the southernmost contiguous state in the United States.
In physics, a force is any interaction that, when unopposed, will change the motion of an object.
The French Revolution (Révolution française) was a period of far-reaching social and political upheaval in France and its colonies that lasted from 1789 until 1799.
Frequency is the number of occurrences of a repeating event per unit of time.
The gal (symbol: Gal), sometimes called galileo after Galileo Galilei, is a unit of acceleration used extensively in the science of gravimetry.
The gauss, abbreviated as G or Gs, is the cgs unit of measurement of magnetic flux density (or "magnetic induction") (B).
Air Canada Flight 143 was a scheduled domestic passenger flight between Montreal and Edmonton that ran out of fuel on July 23, 1983 at an altitude of, midway through the flight.
Giovanni Giorgi (27 November 1871 – 19 August 1950) was an Italian physicist and electrical engineer who proposed the Giorgi system of measurement, the precursor to the International System of Units (SI).
A grain is a unit of measurement of mass, and in the troy weight, avoirdupois, and Apothecaries' system, equal to exactly.
The gram (alternative spelling: gramme; SI unit symbol: g) (Latin gramma, from Greek γράμμα, grámma) is a metric system unit of mass.
The gravitational metric system (original French term Système des Méchaniciens) is a non-standard system of units, which does not comply with the International System of Units (SI).
The gray (symbol: Gy) is a derived unit of ionizing radiation dose in the International System of Units (SI).
The hectare (SI symbol: ha) is an SI accepted metric system unit of area equal to a square with 100 meter sides, or 10,000 m2, and is primarily used in the measurement of land.
The henry (symbol: H) is the SI derived unit of electrical inductance.
The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.
The earliest recorded systems of weights and measures originate in the 3rd or 4th millennium BC.
Horsepower (hp) is a unit of measurement of power (the rate at which work is done).
An hour (symbol: h; also abbreviated hr.) is a unit of time conventionally reckoned as of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions.
In photometry, illuminance is the total luminous flux incident on a surface, per unit area.
The system of imperial units or the imperial system (also known as British Imperial or Exchequer Standards of 1825) is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced.
In electromagnetism and electronics, inductance is the property of an electrical conductor by which a change in electric current through it induces an electromotive force (voltage) in the conductor.
The Institute of Electrical and Electronics Engineers (IEEE) is a professional association with its corporate office in New York City and its operations center in Piscataway, New Jersey.
The International Bureau of Weights and Measures (Bureau international des poids et mesures) is an intergovernmental organization established by the Metre Convention, through which Member States act together on matters related to measurement science and measurement standards.
The International Electrotechnical Commission (IEC; in French: Commission électrotechnique internationale) is an international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies – collectively known as "electrotechnology".
The International Organization of Legal Metrology (Organisation Internationale de Métrologie Légale - OIML), is an intergovernmental organization, created in 1955 and based in Paris, to promote the global harmonization of the legal metrology procedures that underpin and facilitate international trade.
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
ISO 31 (Quantities and units, International Organization for Standardization, 1992) is a deprecated international standard for the use of physical quantities and units of measurement, and formulas involving them, in scientific and educational documents.
ISO 80000 or IEC 80000 is an international standard promulgated jointly by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC).
There are 33 known isotopes of krypton (36Kr) with atomic mass numbers from 69 through 101.
The joule (symbol: J) is a derived unit of energy in the International System of Units.
The katal (symbol: kat) is the SI unit of catalytic activity.
The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI), and is defined as being equal to the mass of the International Prototype of the Kilogram (IPK, also known as "Le Grand K" or "Big K"), a cylinder of platinum-iridium alloy stored by the International Bureau of Weights and Measures at Saint-Cloud, France.
The kilogram-force (kgf or kgF), or kilopond (kp, from Latin pondus meaning weight), is a gravitational metric unit of force.
The kilometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: km; or) or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the road network of the United Kingdom where the statute mile is the official unit used.
The knot is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.15078 mph).
Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.
In geometric measurements, length is the most extended dimension of an object.
The litre (SI spelling) or liter (American spelling) (symbols L or l, sometimes abbreviated ltr) is an SI accepted metric system unit of volume equal to 1 cubic decimetre (dm3), 1,000 cubic centimetres (cm3) or 1/1,000 cubic metre. A cubic decimetre (or litre) occupies a volume of 10 cm×10 cm×10 cm (see figure) and is thus equal to one-thousandth of a cubic metre. The original French metric system used the litre as a base unit. The word litre is derived from an older French unit, the litron, whose name came from Greek — where it was a unit of weight, not volume — via Latin, and which equalled approximately 0.831 litres. The litre was also used in several subsequent versions of the metric system and is accepted for use with the SI,, p. 124. ("Days" and "hours" are examples of other non-SI units that SI accepts.) although not an SI unit — the SI unit of volume is the cubic metre (m3). The spelling used by the International Bureau of Weights and Measures is "litre", a spelling which is shared by almost all English-speaking countries. The spelling "liter" is predominantly used in American English. One litre of liquid water has a mass of almost exactly one kilogram, because the kilogram was originally defined in 1795 as the mass of one cubic decimetre of water at the temperature of melting ice. Subsequent redefinitions of the metre and kilogram mean that this relationship is no longer exact.
The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source.
In photometry, luminous flux or luminous power is the measure of the perceived power of light.
In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.
The lux (symbol: lx) is the SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area.
A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials.
In physics, specifically electromagnetism, the magnetic flux (often denoted or) through a surface is the surface integral of the normal component of the magnetic field B passing through that surface.
Maiquetía is a city located in the Central Region of Venezuela, in the state of Vargas.
The Mars Climate Orbiter (formerly the Mars Surveyor '98 Orbiter) was a robotic space probe launched by NASA on December 11, 1998 to study the Martian climate, Martian atmosphere, and surface changes and to act as the communications relay in the Mars Surveyor '98 program for Mars Polar Lander.
Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied.
In physics, mass–energy equivalence states that anything having mass has an equivalent amount of energy and vice versa, with these fundamental quantities directly relating to one another by Albert Einstein's famous formula: E.
The maxwell (symbol: Mx) is the CGS (centimetre-gram-second) unit of magnetic flux.
Mechanics (Greek μηχανική) is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment.
The metre (British spelling and BIPM spelling) or meter (American spelling) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in some metric systems, including the International System of Units (SI).
The metre–tonne–second or MTS system of units is a system of physical units.
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit.
Metrology is the science of measurement.
Miami is a major port city on the Atlantic coast of south Florida in the southeastern United States.
The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length.
The minute is a unit of time or angle.
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
The mole, symbol mol, is the SI unit of amount of substance.
The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.
The National Transportation Safety Board (NTSB) is an independent U.S. government investigative agency responsible for civil transportation accident investigation.
A nautical mile is a unit of measurement defined as exactly.
Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.
The newton (symbol: N) is the International System of Units (SI) derived unit of force.
The oersted (symbol Oe) is the unit of the auxiliary magnetic field '''H''' in the centimetre–gram–second system of units (CGS).
The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.
Oxford is a city in the South East region of England and the county town of Oxfordshire.
Oxford University Press (OUP) is the largest university press in the world, and the second oldest after Cambridge University Press.
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength.
Phenobarbital, also known as phenobarbitone or phenobarb, is a medication recommended by the World Health Organization for the treatment of certain types of epilepsy in developing countries.
A phot (ph) is a photometric unit of illuminance, or luminous flux through an area.
The pièze is the unit of pressure in the metre–tonne–second system of units (mts system), used, e.g., in the former Soviet Union 1933–1955.
The poise (symbol P) is the unit of dynamic viscosity (absolute viscosity) in the centimetre–gram–second system of units.
The pound-force (symbol: lbf, sometimes lbf) is a unit of force used in some systems of measurement including English Engineering units and the British Gravitational System.
In physics, power is the rate of doing work, the amount of energy transferred per unit time.
Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.
A proper noun is a noun that in its primary application refers to a unique entity, such as London, Jupiter, Sarah, or Microsoft, as distinguished from a common noun, which usually refers to a class of entities (city, planet, person, corporation), or non-unique instances of a specific class (a city, another planet, these persons, our corporation).
The rad is a unit of absorbed radiation dose, defined as 1 rad.
Radioactive decay (also known as nuclear decay or radioactivity) is the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron in the case of internal conversion.
The realisation of a unit of measure is the conversion of its definition into reality.
The roentgen or röntgen (symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays.
The roentgen equivalent man (or rem) is an older, CGS unit of equivalent dose, effective dose, and committed dose which are measures of the health effect of low levels of ionizing radiation on the human body.
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.
SI derived units are units of measurement derived from the seven base units specified by the International System of Units (SI).
The siemens (symbol: S) is the derived unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).
The sievert (symbol: SvNot be confused with the sverdrup or the svedberg, two non-SI units that sometimes use the same symbol.) is a derived unit of ionizing radiation dose in the International System of Units (SI) and is a measure of the health effect of low levels of ionizing radiation on the human body.
The slug is a derived unit of mass in the weight-based system of measures, most notably within the British Imperial measurement system and in the United States customary measures system.
The solar mass is a standard unit of mass in astronomy, equal to approximately.
The Soviet Union, officially the Union of Soviet Socialist Republics (USSR) was a socialist state in Eurasia that existed from 1922 to 1991.
Square kilometre (International spelling as used by the International Bureau of Weights and Measures) or square kilometer (American spelling), symbol km2, is a multiple of the square metre, the SI unit of area or surface area.
The square metre (International spelling as used by the International Bureau of Weights and Measures) or square meter (American spelling) is the SI derived unit of area, with symbol m2 (Unicode character). It is the area of a square whose sides measure exactly one metre.
The standard acceleration due to gravity (or standard acceleration of free fall), sometimes abbreviated as standard gravity, usually denoted by or, is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth.
The statcoulomb (statC) or franklin (Fr) or electrostatic unit of charge (esu) is the physical unit for electrical charge used in the esu-cgs (centimetre–gram–second system of units) and Gaussian units.
The statmho is the unit of electrical conductance in the electrostatic system of units (ESU), an extension of the centimeter-gram-second (CGS) system to cover electrical units.
The statvolt is a unit of voltage and electrical potential used in the esu-cgs and gaussian system of units.
The sthène (symbol sn), sometimes spelled (or misspelled) sthéne or sthene (from the Greek σθένος (sthenos) meaning "force"), is an obsolete unit of force or thrust in the metre–tonne–second system of units (mts) introduced in France in 1919.
The stilb (sb) is the CGS unit of luminance for objects that are not self-luminous.
A system of measurement is a collection of units of measurement and rules relating them to each other.
Temperature is a physical quantity expressing hot and cold.
The tesla (symbol T) is a derived unit of magnetic flux density (informally, magnetic field strength) in the International System of Units.
Thermal energy is a term used loosely as a synonym for more rigorously-defined thermodynamic quantities such as the internal energy of a system; heat or sensible heat, which are defined as types of transfer of energy (as is work); or for the characteristic energy of a degree of freedom in a thermal system kT, where T is temperature and k is the Boltzmann constant.
Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.
The tonne (Non-SI unit, symbol: t), commonly referred to as the metric ton in the United States, is a non-SI metric unit of mass equal to 1,000 kilograms;.
The unified atomic mass unit or dalton (symbol: u, or Da) is a standard unit of mass that quantifies mass on an atomic or molecular scale (atomic mass).
A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.
United States customary units are a system of measurements commonly used in the United States.
Venezuela, officially denominated Bolivarian Republic of Venezuela (República Bolivariana de Venezuela),Previously, the official name was Estado de Venezuela (1830–1856), República de Venezuela (1856–1864), Estados Unidos de Venezuela (1864–1953), and again República de Venezuela (1953–1999).
The viscosity of a fluid is the measure of its resistance to gradual deformation by shear stress or tensile stress.
The volt (symbol: V) is the derived unit for electric potential, electric potential difference (voltage), and electromotive force.
Voltage, electric potential difference, electric pressure or electric tension (formally denoted or, but more often simply as V or U, for instance in the context of Ohm's or Kirchhoff's circuit laws) is the difference in electric potential between two points.
Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains.
The watt (symbol: W) is a unit of power.
In physics, the weber (symbol: Wb) is the SI unit of magnetic flux.
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