The International Bureau of Weights and Measures is an intergovernmental organisation, through which its 67 member-states act on measurement standards in areas including chemistry, ionising radiation,
Pavillon de Breteuil in 2017
Replicas of historical metric standards, including an iron copy of the mètre des Archives.
Ibáñez apparatus calibrated on the metric Spanish standard and used by the Swiss Geodetic Commission at Aarberg, in canton of Bern, Switzerland in 1880.
Creating the metre-alloy in 1874 at the Conservatoire des Arts et Métiers. Present Henri Tresca, George Matthey, Saint-Claire Deville, and Debray
The International System of Units, internationally known by the abbreviation SI, is the modern form of the metric system and the world's most widely used system of measurement. It is the only system o
International Bureau of Weights and Measures
…through which its 67 member-states act on measurement standards in areas including chemistry, ionising radiation, physical metrology, as well as the International System of Units (SI) and Coordinated Universal Time (UTC). It is headquartered in the Pavillon de Breteuil in Saint-Cloud, near Paris, France. The organisation has…
Silicon sphere for the Avogadro project used for measuring the Avogadro constant to a relative standard uncertainty of 2×10−8 or less, held by Achim Leistner
Stone marking the Austro-Hungarian/Italian border at Pontebba displaying myriametres, a unit of 10 km used in Central Europe in the 19th century (but since deprecated)
Closeup of the National Prototype Metre, serial number 27, allocated to the United States