The official definition of a kilogram has been changing for well over a century, but this week it may be redefined for the final time. After years of debate and discussion, scientists from around the ...

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 ...

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 U.S. National Institute of Standards and Technology called this Friday a “turning point for humanity,” even though the difference between this day and the day before weighs, theoretically, nothing ...

It’s one of those things where if you think about it too much, your head might explode. We know there are 1,000 grams in a kilogram, and 1,000 kilograms in a metric ton, but how was it ever decided ...

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.

Next Friday (November 16), representatives of 57 countries will assemble at a conference in Versaille, France, to vote on changing the definition of the kilogram, The Guardian reports. The proposed ...

In this photo taken Wednesday, Oct. 17, 2018., the head of BIPM (International Bureau of Weights and Measures) Martin J.T. Milton holds a replica of the International Prototype Kilogram in Sevres, ...

The international system of measurements has been overhauled with new definitions for the kilogram and other key units. At a meeting in Versailles, France, countries have voted to approve the ...