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Kilogram Definition Weighed

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ALBUQUERQUE, N.M., March 5, 2008 -- The kilogram is losing weight, and many in standard-measurement circles believe it should be redefined.  The kilogram is the unit of mass in the International System of Units (abbreviated as SI, from the French Le Système International d'Unités). It is now defined through an artefact known as the international prototype kept at the Bureau International des Poids et Mesures (International Bureau of Weights and Measures, or BIPM), a standards organization in Sèvres, a suburb of Paris. The International Prototype Kilogram (IPK) or “Le Grand K,” made in the 1880s, is a bar of platinum-iridium...Read full article

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    Published: March 2008
    Glossary
    metrology
    Metrology is the science and practice of measurement. It encompasses the theoretical and practical aspects of measurement, including the development of measurement standards, techniques, and instruments, as well as the application of measurement principles in various fields. The primary objectives of metrology are to ensure accuracy, reliability, and consistency in measurements and to establish traceability to recognized standards. Metrology plays a crucial role in science, industry,...
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    si
    Systeme Internationale d'Unites, the international metric system of units.
    Ben CasadosBiophotonicsBIPMdefensefiber opticsHy TranInternational System of Unitskilogram definitionmetrologynanoNews & FeaturesphotonicsSandia Primary Standards LaboratorySi

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