Kilogram 18, UK copy of SI unit of mass. The UK's National Standard Kilogram, copy number 18 of the International Prototype, was allocated in 1889 whe
Kilogram 18, UK copy of SI unit of mass. The UK's National Standard Kilogram, copy number 18 of the International Prototype, was allocated in 1889 when the standard was established. It is kept at the National Physical Laboratory (NPL) as the national standard. Periodically, it is compared with the original and other copies. The International Prototype Kilogram, a cylinder of platinum-iridium alloy, is held at the Bureau International des Poids et Mesures (BIPM), at Sevres, France. For Kilogram 18 in its specially-designed glass and stainless steel enclosure, see image C016/2043. Photographed at the NPL, Teddington, UK.
Size: 3685px × 4850px
Photo credit: © NATIONAL PHYSICAL LABORATORY © CROWN COPYRIGHT/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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