Email
Password
Remember meForgot password?
    Log in with Twitter

2019-05-19 15:42:17

A computer-generated image of the International Prototype kilogram (IPK), which is made from an alloy of 90% platinum and 10% iridium (by weight) and machined into a right-circular cylinder (height = diameter) of 39.17 mm. The IPK is kept at the Bureau International des Poids et Mesures (International Bureau of Weights and Measures) in Sèvres on the outskirts of Paris.

Image uploaded by Tim Sandle
Featured In
News May 20, 2019 - Essential Science: Nature will now define the kilogram
Latest News
Top News