Redefinition of the kilogram

The kg is currently defined by the mass of a Pt-Ir cylinder. This has been found to change by 50ug over 100 years.The Avogadro project seeks to redefine the Kg by “counting” the number of atoms in a precisely dimensioned sphere of Silicon.NIS is one of only seven laboratories worldwide to possess one of the new Silicon SpheresNIS Silicon Sphere - EgyptPTB Silicon Sphere - Germany