105 relations: Ampere, Antigua and Barbuda, Argentina, Atmosphere (unit), Atto-, Austria-Hungary, Bar (unit), Barbados, Becquerel, Belgium, Belize, Caesium, Candela, Carat (mass), Celsius, Coulomb, Czechoslovakia, Dominica, Economic union, Empire of Brazil, Exa-, Farad, Femto-, French Academy of Sciences, French Third Republic, German Empire, Giga-, Gray (unit), Grenada, Guyana, Henry (unit), Hertz, History of the metre, Institute for Reference Materials and Measurements, International Bureau of Weights and Measures, International Committee for Weights and Measures, International organization, International System of Units, Iridium, Jamaica, Johnson Matthey, Joule, Katal, Kelvin, Kilogram, Kingdom of Italy, Kingdom of Portugal, Litre, Long and short scales, Lumen (unit), ..., Lux, Magnetic flux quantum, Mega-, Member state, Metre, Metre Convention, Metric system, Metrology, Micro-, Mole (unit), Mutual recognition agreement, Nano-, National Conference on Weights and Measures, National Institute of Standards and Technology, Newton (unit), Ohm, Ole Jacob Broch, Ottoman Empire, Oxford University Press, Pascal (unit), Peru, Peta-, Pico-, Planck constant, Platinum, Proposed redefinition of SI base units, Quantum Hall effect, Radian, Restoration (Spain), Russian Empire, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Sèvres, SI base unit, SI derived unit, Siemens (unit), Sievert, Standard gravity, Steradian, Stere, Suriname, Switzerland, Tera-, Tesla (unit), Trinidad and Tobago, Union between Sweden and Norway, Venezuela, Volt, Watt, Weber (unit), Yocto-, Yotta-, Zepto-, Zetta-. Expand index (55 more) » « Shrink index
The ampere (symbol: A), often shortened to "amp",SI supports only the use of symbols and deprecates the use of abbreviations for units.
Antigua and Barbuda is a sovereign state in the West Indies in the Americas, lying between the Caribbean Sea and the Atlantic Ocean.
Argentina, officially the Argentine Republic (República Argentina), is a federal republic located mostly in the southern half of South America.
The standard atmosphere (symbol: atm) is a unit of pressure defined as.
Atto (symbol a) is a unit prefix in the metric system denoting a factor of 10−18 or.
Austria-Hungary, often referred to as the Austro-Hungarian Empire or the Dual Monarchy in English-language sources, was a constitutional union of the Austrian Empire (the Kingdoms and Lands Represented in the Imperial Council, or Cisleithania) and the Kingdom of Hungary (Lands of the Crown of Saint Stephen or Transleithania) that existed from 1867 to 1918, when it collapsed as a result of defeat in World War I. The union was a result of the Austro-Hungarian Compromise of 1867 and came into existence on 30 March 1867.
The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI).
Barbados is an island country in the Lesser Antilles of the West Indies, in the Caribbean region of North America.
The becquerel (symbol: Bq) is the SI derived unit of radioactivity.
Belgium, officially the Kingdom of Belgium, is a country in Western Europe bordered by France, the Netherlands, Germany and Luxembourg.
Belize, formerly British Honduras, is an independent Commonwealth realm on the eastern coast of Central America.
Caesium (British spelling and IUPAC spelling) or cesium (American spelling) is a chemical element with symbol Cs and atomic number 55.
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.
The carat (ct) (not to be confused with the karat, sometimes spelled carat, a unit of purity of gold alloys), is a unit of mass equal to 200 mg (0.2 g; 0.007055 oz) and is used for measuring gemstones and pearls.
The Celsius scale, previously known as the centigrade scale, is a temperature scale used by the International System of Units (SI).
The coulomb (symbol: C) is the International System of Units (SI) unit of electric charge.
Czechoslovakia, or Czecho-Slovakia (Czech and Československo, Česko-Slovensko), was a sovereign state in Central Europe that existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until its peaceful dissolution into the:Czech Republic and:Slovakia on 1 January 1993.
Dominica (Island Carib), officially the Commonwealth of Dominica, is an island republic in the West Indies.
An economic union is a type of trade bloc which is composed of a common market with a customs union.
The Empire of Brazil was a 19th-century state that broadly comprised the territories which form modern Brazil and (until 1828) Uruguay.
Exa is a decimal unit prefix in the metric system denoting 1018 or.
The farad (symbol: F) is the SI derived unit of electrical capacitance, the ability of a body to store an electrical charge.
Femto- (symbol f) is a unit prefix in the metric system denoting a factor of 10−15 or.
The French Academy of Sciences (French: Académie des sciences) is a learned society, founded in 1666 by Louis XIV at the suggestion of Jean-Baptiste Colbert, to encourage and protect the spirit of French scientific research.
The French Third Republic (La Troisième République, sometimes written as La IIIe République) was the system of government adopted in France from 1870 when the Second French Empire collapsed during the Franco-Prussian War until 1940 when France's defeat by Nazi Germany in World War II led to the formation of the Vichy government in France.
The German Empire (Deutsches Kaiserreich, officially Deutsches Reich),Herbert Tuttle wrote in September 1881 that the term "Reich" does not literally connote an empire as has been commonly assumed by English-speaking people.
Giga is a unit prefix in the metric system denoting a factor of a (short-form) billion (109 or 000).
The gray (symbol: Gy) is a derived unit of ionizing radiation dose in the International System of Units (SI).
Grenada is a sovereign state in the southeastern Caribbean Sea consisting of the island of Grenada and six smaller islands at the southern end of the Grenadines island chain.
Guyana (pronounced or), officially the Co-operative Republic of Guyana, is a sovereign state on the northern mainland of South America.
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.
In the aftermath of the French Revolution (1789), the traditional units of measure used in the Ancien Régime were replaced.
The Institute for Reference Materials and Measurements (IRMM), located in Geel, Belgium, is one of the seven institutes of the Joint Research Centre (JRC), a Directorate-General of the European Commission (EC).
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 Committee for Weights and Measures (abbreviated CIPM from the French Comité international des poids et mesures) consists of eighteen persons, each of a different nationality, from Member States of the Metre Convention (Convention du Mètre) appointed by the General Conference on Weights and Measures (CGPM) whose principal task is to promote worldwide uniformity in units of measurement by taking direct action or by submitting proposals to the CGPM.
An international organization is an organization with an international membership, scope, or presence.
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.
Iridium is a chemical element with symbol Ir and atomic number 77.
Jamaica is an island country situated in the Caribbean Sea.
Johnson Matthey is a British multinational speciality chemicals and sustainable technologies company headquartered in the United Kingdom.
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 Kingdom of Italy (Regno d'Italia) was a state which existed from 1861—when King Victor Emmanuel II of Sardinia was proclaimed King of Italy—until 1946—when a constitutional referendum led civil discontent to abandon the monarchy and form the modern Italian Republic.
The Kingdom of Portugal (Regnum Portugalliae, Reino de Portugal) was a monarchy on the Iberian Peninsula and the predecessor of modern Portugal.
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 long and short scales are two of several large-number naming systems for integer powers of ten that use the same words with different meanings.
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.
The lux (symbol: lx) is the SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area.
The magnetic flux, represented by the symbol, threading some contour or loop is defined as the magnetic field multiplied by the loop area, i.e..
Mega is a unit prefix in metric systems of units denoting a factor of one million (106 or 000).
A member state is a state that is a member of an international organization or of a federation or confederation.
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 Convention (Convention du Mètre), also known as the Treaty of the Metre, is an international treaty that was signed in Paris on 20 May 1875 by representatives of 17 nations (Argentina, Austria-Hungary, Belgium, Brazil, Denmark, France, Germany, Italy, Peru, Portugal, Russia, Spain, Sweden and Norway, Switzerland, Turkey, United States of America, and Venezuela).
The metric system is an internationally adopted decimal system of measurement.
Metrology is the science of measurement.
Micro- (symbol µ) is a unit prefix in the metric system denoting a factor of 10−6 (one millionth).
The mole, symbol mol, is the SI unit of amount of substance.
A mutual recognition agreement (MRA) is an international agreement by which two or more countries agree to recognize one another's conformity assessments.
Nano- (symbol n) is a unit prefix meaning "one billionth".
The National Conference on Weights and Measures (NCWM) is a not-for-profit corporation dedicated to developing and regulating the United States technical standards for weights and measures.
The National Institute of Standards and Technology (NIST) is one of the oldest physical science laboratories in the United States.
The newton (symbol: N) is the International System of Units (SI) derived unit of force.
The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.
Ole Jacob Broch (14 January 1818 – 5 February 1889) was a Norwegian mathematician, physicist, economist and government minister.
The Ottoman Empire (دولت عليه عثمانیه,, literally The Exalted Ottoman State; Modern Turkish: Osmanlı İmparatorluğu or Osmanlı Devleti), also historically known in Western Europe as the Turkish Empire"The Ottoman Empire-also known in Europe as the Turkish Empire" or simply Turkey, was a state that controlled much of Southeast Europe, Western Asia and North Africa between the 14th and early 20th centuries.
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.
Peru (Perú; Piruw Republika; Piruw Suyu), officially the Republic of Peru, is a country in western South America.
Peta is a decimal unit prefix in the metric system denoting multiplication by 1015.
Pico- (symbol p) is a unit prefix in the metric system denoting one trillionth, a factor of 10−12.
The Planck constant (denoted, also called Planck's constant) is a physical constant that is the quantum of action, central in quantum mechanics.
Platinum is a chemical element with symbol Pt and atomic number 78.
The International Committee for Weights and Measures (CIPM) has proposed revised definitions of the SI base units, for consideration at the 26th General Conference on Weights and Measures (CGPM).
The quantum Hall effect (or integer quantum Hall effect) is a quantum-mechanical version of the Hall effect, observed in two-dimensional electron systems subjected to low temperatures and strong magnetic fields, in which the Hall conductance undergoes quantum Hall transitions to take on the quantized values where is the channel current, is the Hall voltage, is the elementary charge and is Planck's constant.
The radian (SI symbol rad) is the SI unit for measuring angles, and is the standard unit of angular measure used in many areas of mathematics.
The Restoration (Restauración), or Bourbon Restoration (Restauración borbónica), is the name given to the period that began on 29 December 1874 — after a coup d'état by Martínez-Campos ended the First Spanish Republic and restored the monarchy under Alfonso XII — and ended on 14 April 1931 with the proclamation of the Second Spanish Republic.
The Russian Empire (Российская Империя) or Russia was an empire that existed across Eurasia and North America from 1721, following the end of the Great Northern War, until the Republic was proclaimed by the Provisional Government that took power after the February Revolution of 1917.
Saint Kitts and Nevis, also known as the Federation of Saint Christopher and Nevis, is an island country in the West Indies.
Saint Lucia (Sainte-Lucie) is a sovereign island country in the West Indies in the eastern Caribbean Sea on the boundary with the Atlantic Ocean.
Saint Vincent and the Grenadines is a sovereign state in the Lesser Antilles island arc, in the southern portion of the Windward Islands, which lies in the West Indies at the southern end of the eastern border of the Caribbean Sea where the latter meets the Atlantic Ocean.
Sèvres is a commune in the southwestern suburbs of Paris, France.
The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units can be derived.
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 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 stere or stère is a unit of volume in the original metric system equal to one cubic metre.
Suriname (also spelled Surinam), officially known as the Republic of Suriname (Republiek Suriname), is a sovereign state on the northeastern Atlantic coast of South America.
Switzerland, officially the Swiss Confederation, is a sovereign state in Europe.
Tera is a unit prefix in the metric system denoting multiplication by 1012 or (one trillion short scale; one billion long scale).
The tesla (symbol T) is a derived unit of magnetic flux density (informally, magnetic field strength) in the International System of Units.
Trinidad and Tobago, officially the Republic of Trinidad and Tobago, is a twin island sovereign state that is the southernmost nation of the West Indies in the Caribbean.
Sweden and Norway or Sweden–Norway (Svensk-norska unionen; Den svensk-norske union), officially the United Kingdoms of Sweden and Norway, or as the United Kingdoms, was a personal union of the separate kingdoms of Sweden and Norway under a common monarch and common foreign policy that lasted from 1814 until its amicable and peaceful dissolution in 1905.
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 volt (symbol: V) is the derived unit for electric potential, electric potential difference (voltage), and electromotive force.
The watt (symbol: W) is a unit of power.
In physics, the weber (symbol: Wb) is the SI unit of magnetic flux.
Yocto (symbol y) is a unit prefix in the metric system denoting a factor of 10−24 or.
Yotta is the largest decimal unit prefix in the metric system, denoting a factor of 1024 or; that is, one million million million million, or one septillion.
Zepto (unit symbol z) is a unit prefix in the metric system denoting a factor of 10−21 or.
Zetta is a decimal unit prefix in the metric system denoting a factor of 1021 or.
CGPM, CPGM, Conference Generale des Poids et Mesures, Conference generale des poids et mesures, Conférence Générale des Poids et Mesures, Conférence générale des poids et mesures, General Conference of Weights and Measures, General Conference on Weights & Measures, General conference on weights and measures.