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...
Metrology - Wikipedia
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...
Standard (metrology) - Wikipedia
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...
History of measurement - Wikipedia
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...
Standards organizations - Wikipedia
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 ...
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...
Radian - Wikipedia
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...
History of the metric system
Concepts similar to those behind the metric system had been discussed in the 16th and 17th centuries. Simon Stevin had published his ideas for a decimal notation and John Wilkins had published a propo...
History of the metric system - Wikipedia
Gaussian units
Gaussian units comprise a metric system of physical units. This system is the most common of the several electromagnetic unit systems based on cgs (centimetre–gram–second) units. It is also called the...
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...
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...
Measurement - Wikipedia
False precision
False precision (also called overprecision, fake precision, misplaced precision and spurious accuracy) occurs when numerical data are presented in a manner that implies better precision than is actual...
False precision - Wikipedia
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...
Coordinate-measuring machine - Wikipedia
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...
Airy points
Airy Points are used for precision measurement (metrology) to support a length standard in such a way as to minimise bending or droop. The points are symmetrically arranged around the centre of the le...
Airy points - Wikipedia
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...
Norwegian Metrology Service - Wikipedia
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 – ...
Brown Instrument Company
75°09′34″W / 40.02139°N 75.15944°W / 40.02139; -75.15944Brown Instrument Company was a U.S. firm known for high-quality instruments (such as pyrometers, thermometers, hygromet...
Brown Instrument Company - Wikipedia
Optical heterodyne detection
Optical heterodyne detection is the implementation of heterodyne detection principle using a nonlinear optical process. In heterodyne detection, a signal of interest at some frequency is non-linearly ...
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 ...
Pseudoscientific metrology - Wikipedia
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...
Metre - Wikipedia
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...
Interferometry - Wikipedia
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...
Planck charge
In physics, the Planck charge, denoted by , is one of the base units in the system of natural units called Planck units. It is a quantity of electric charge defined in terms of fundamental physical co...