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Metrology

Mass metrology

News and Updates

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NIST Researchers Holding Steady in an Atomic-Scale Tug-of-War

March 30, 2010

How hard do you have to pull on a single atom of--let's say--gold to detach it from the end of a chain of like atoms?* It's a measure of the astonishing

New Enhancements Upgrade NIST Mass Spectra Library

December 22, 2005

After three years of development, the National Institute of Standards and Technology (NIST) has released a major upgrade of the widely used NIST/EPA/NIH Mass

Physicist Richard Steiner adjusts the electronic kilogram, an experimental apparatus for defining mass in terms of the basic properties of nature.

NIST Improves Accuracy of 'Watt Balance' Method for Defining the Kilogram

September 13, 2005

GAITHERSBURG, MD—A leading experimental method for defining the kilogram in terms of properties of nature is now more accurate than ever, scientists at the

Replace Kilogram Artifact Now With Definition Based on Nature, Experts Say

February 14, 2005

London, Feb. 14, 2005—It's time to replace the 115-year-old kilogram artifact as the world's official standard for mass, even though experiments generally

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NIST Headquarters
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