National Standard of Mass, Kilogram


This is a replica showing the size and shape of the kilogram standard. The replica is in a glass dome. The standard for the kilogram unit of mass is a cylinder of platinum-iridium alloy kept by the International Bureau of Weights and Measures near Paris. A duplicate kept at National Institute of Standards and Technology serves as the mass standard for the United States.


Size: 3600px × 3600px
Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
Model Released: No

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