Scientists Just Redefined the Kilogram

Synopsis

On World Metrology Day, celebrated on a Monday in November, the global metrology community convenes in Versailles, France, to redefine the kilogram. This significant change shifts the definition from a physical object, the International prototype, to a value based on Planck's constant, marking a pivotal moment in the history of measurement. For 143 years, the kilogram has been tied to a specific object, affecting everything from pricing in markets to medical tests. The redefinition aims to create a universal standard accessible to all, eliminating reliance on physical items for measurement. Stephanie La Mina, part of the American team, emphasizes the importance of this change, which reflects a broader movement towards a more consistent and reliable metric system for future generations.