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Science loses a kilogram

The world says goodbye to the original kilogram

The world says goodbye to the original kilogram today, on World Metrology Day, after representatives from around the world voted to base the kilogram...
The International Prototype of the Kilogram (IPK) is held in an underground vault at the International Bureau of Weights and Measures (BIPM), located in Sèvres, near Paris. Following the decision to redefine the SI kilogram starting 20th May 2019, the definition of the kilogram will no longer be based on the physical artefact called the International Prototype but rather on a constant of physics, as are the other seven base units of the SI. The redefinition of the kilogram marks the end of artefacts used to define our measurement units. Credit: © BIPM

The world’s definition of the kilogram is forever changed

To make a milestone in the science of measurement, representatives from 60 nations voted to redefine the International System of Units (SI), changing the...
Kilogram No. 20, in the U.S., is one of several “working standards.” Credit: Science Source

Redefining the kilogram: A turning point for humanity

The kilogram is the base unit of mass in the International System of Units (SI), and is defined as being equal to the mass...