Deep underneath the Parisian suburb of Saint-Cloud, in a vault that can only be opened by three people wielding three different keys, there lies a hunk of metal that is so crucial to the world of ...

The Latest on a scientific meeting on how to define weights and measures (all times local): 1:35 p.m. The international system of measurements has been overhauled with new definitions for the kilogram ...

Sealed under a trio of nested glass bell jars, a gleaming metal cylinder sits in a temperature-controlled vault in the bowels of the International Bureau of Weights and Measures in Sèvres, France.

The NIST-4 Kibble balance, an electromagnetic weighing machine that is used to measure Planck's constant, and in turn, redefine the kilogram. Jennifer Lauren Lee / NIST Locked in a vault that requires ...

Project Avogadro seeks to change the definition of a kilogram from the weight of a hunk of metal that currently resides in France to a measurement based on fundamental constants (like every other unit ...

Add Yahoo as a preferred source to see more of our stories on Google. In this photo taken Wednesday, Oct. 17, 2018., the head of BIPM (International Bureau of Weights and Measures) Martin J.T. Milton ...