Metrology
Metrology is the science of measurement. Metrology includes all theoretical and practical aspects of measurement. The word comes from Greek μέτρον (metron), "measure" + "λόγος" (logos), amongst others...
Measurement
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Standard (metrology)
In the science of measurement, a standard is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity. Standards are the fundamental reference...
History of measurement
 This article incorporates public domain material from websites or documents of the National Institute of Standards and Technology.As civilization developed, so too did the need for unit...
Standards organizations
A standards organization, standards body, standards developing organization (SDO), or standards setting organization (SSO) is any organization whose primary activities are developing, coordinating, pr...
Abampere
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). One abampere is equa...
Korea Research Institute of Standards and Science
The Korea Research Institute of Standards and Science (KRISS) is the national measurement standards laboratory for the Republic of Korea. It is a government-funded institute responsible for providing ...
Measurement in quantum mechanics
The framework of quantum mechanics requires a careful definition of measurement. The issue of measurement lies at the heart of the problem of the interpretation of quantum mechanics, for which there ...
Radian
The radian is the standard unit of angular measure, used in many areas of mathematics. An angle's measurement in radians is numerically equal to the length of a corresponding arc of a unit circle, one...
Bya
In astronomy, geology, and paleontology, bya or "b.y.a." is an initialism for billion years ago. This abbreviation is commonly used as a unit of time to denote length of time before the present. Speci...
Repeatability
Repeatability or test–retest reliability is the variation in measurements taken by a single person or instrument on the same item and under the same conditions. A less-than-perfect test–retest reliabi...
Brown & Sharpe
Brown is the color of dark wood or rich soil. It is a composite color; in printing or painting, it is made by combining red, black and yellow, or red, yellow and blue. In the RGB color model used to m...
Measurement
Measurement (from Old French, mesurement) is the assignment of numbers to objects or events. It is a cornerstone of most natural sciences, technology, economics, and quantitative research in other soc...
Coordinate-measuring machine
A coordinate measuring machine (CMM) is a device for measuring the physical geometrical characteristics of an object. This machine may be manually controlled by an operator or it may be computer contr...
Unified Code for Units of Measure
The Unified Code for Units of Measure (the UCUM) is a system of codes for unambiguously representing measurement units to both humans and machines. The code set includes all units defined in ISO 1000...
Calibration
Calibration is a comparison between measurements – one of known magnitude or correctness made or set with one device and another measurement made in as similar a way as possible with a second device.T...
Conventional electrical unit
A conventional electrical unit (or conventional unit where there is no risk of ambiguity) is a unit of measurement in the field of electricity which is based on the so-called "conventional values" of ...
Mass-to-charge ratio
The mass-to-charge ratio (m/Q) is a physical quantity that is most widely used in the electrodynamics of charged particles, e.g. in electron optics and ion optics. It appears in the scientific fields...
Norwegian Metrology Service
Norwegian Metrology Service (Norwegian: Justervesenet) is a Norwegian government agency responsible for metrology. Its main responsibility is to ensure that all measuring equipment in Norway is tr...
Joint Committee for Guides in Metrology
The Joint Committee for Guides in Metrology (JCGM), is an organization that prepared the "Guide to the expression of uncertainty in measurement" (GUM) and the "International vocabulary of metrology – ...
Pseudoscientific metrology
Some approaches in the branch of historic metrology are highly speculative and can be qualified as pseudoscience.
In 1637 John Greaves, professor of geometry at Gresham College, made his first of ...
Magnetic flux quantum
The magnetic flux quantum, represented by the symbol Φ, threading some contour or loop is defined as the magnetic inductance B multiplied by the loop area S, i.e. Φ = B · S. Obviously, both B and S ca...
Metre
The metre or meter (American spelling), (SI unit symbol: m), is the fundamental unit of length (SI dimension symbol: L) in the International System of Units (SI), which is maintained by the BIPM. Orig...
Interferometry
Interferometry is a family of techniques in which waves, usually electromagnetic, are superimposed in order to extract information about the waves. Interferometry is an important investigative techniq...
History of the metre
In the aftermath of the French Revolution (1789), the old units of measure that were associated with the ancien régime were replaced by new units. The livre was replaced by the decimal franc, and a ne...
Magritek
Magritek is a scientific instrument company based in Wellington, New Zealand, and Aachen, Germany, that was established in 2004 and specialises in compact, portable and benchtop nuclear magnetic reson...
NCSL International
NCSL International (NCSLI) (from the founding name "National Conference of Standards Laboratories") is a global, non-profit organization whose membership is open to any organization with an interest i...