50 ug over 130 years is way too fast > The reason for this drift has eluded physicists who have dedicated their careers to the SI unit of mass. No plausible me

50 ug over 130 years is way too fast > The reason for this drift has eluded physicists who have dedicated their careers to the SI unit of mass. No plausible mechanism has been proposed to explain either a steady decrease in the mass of the IPK, or an increase in that of its replicas dispersed throughout the world https://en.m.wikipedia.org/wiki/International_Prototype_of_the_Kilogram https://en.m.wikipedia.org/wiki/International_Prototype_of_t...