Jon Pratt

Jon Pratt is leader of the Fundamental Electrical Measurements Group at the National Institute of Standards and Technology in Gaithersburg, Maryland.



Redefining the Kilogram

All the scales in the world are calibrated against a 125-year-old chunk of metal in a vault on the outskirts of Paris. Now scientists are looking to redefine the standard of what “kilogram” really means.

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