AdvertisementSay Au Revoir To That Hunk Of Metal In France That Has Defined The KilogramNovember 13, 2018Nell GreenfieldboycefacebookEmailForged in 1879 and sanctioned by the General Conference on Weights and Measures at its first meeting, Le Grand K, the international prototype of the kilogram, has been kept under lock and key in a vault outside Paris. (BIPM)
