4137 / Mass (Kilogram): Sample of the Ur-Kilo-Safe at the BIPM, SЏvres bei Paris: EUROPA, FRANKREICH, HAUTS-DE-SEINE, SEVRES (SEVRES, FRANCE), 11.10.2006: Kilogram, SI base unit of mass. Inside a safe in the basement of the Bureau International des Poids et Mesures BIPM in Sevres near Paris, France, the International Prototype Kilogram `K` rests safely protected by 3 glass covers. On display in the foyer of the cellar, there is a historical scale model of the old safe, where `K` and its official copies were originally kept. Since it was made from a platinum-iridium alloy in 1883, `K` defines the kilogram worldwide. - Marc Steinmetz / VISUM - Keywords: France, Paris, Sevres, Bureau, International, des, Poids, et, Mesures, BIPM, science, physics, metrology, base, unit, international, system, of, units, SI, measure, measurement, standard, accurate, accuracy, prototype, safe, strongbox, basement, scale, model, historical, platinum, iridium, metrical
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