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A biweekly news digest from the
National Institute of Standards and Technology
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MAY 20, 2019
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A Turning Point for Humanity: Redefining the World’s Measurement System
Today—World Metrology Day 2019—is the official launch date of the newly redefined International System of Units (SI). This special issue of Tech Beat brings together some of our past and present content on the SI redefinition. To start things off, here is our introductory essay on the revised SI.
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Historic Vote Ties Kilogram and Other Units to Natural Constants
On November 16, 2018, a group of 60 nations voted to implement the most significant change to the International System of Units (SI) in more than 130 years.
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For All Times, For All Peoples: How Replacing the Kilogram Empowers Industry
Jim Olthoff, NIST's associate director of laboratory programs, explains how redefining the kilogram will empower industry.
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 The ‘Gang of Five’ and the SI Revolution
In this new blog post, NIST's Peter Mohr recounts the backstory of the radical idea behind redefining the kilogram and the SI in general.
A Massive Bet: The Planck Napkin
A bunch of metrologists walk into a bar—and try to guess the value they will measure for the Planck constant. Who came closest?
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NIST MICROSITE ON THE SI REDEFINITION
Learn all about the seven base units of the SI—from the kilogram to the candela, in NIST's microsite on the revised SI!
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The revised SI rests on a foundation of seven values, known as the constants. Learn more in our quick tour of them.
NIST physicist Jon Pratt reflects on his road to the revised SI and what it means for humankind.
NIST's Michael Moldover describes the role he played in measuring the Boltzmann constant, one of the new cornerstones of the revised SI.
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 Just nominated for an EMMY award! See this NIST video, which has been broadcast worldwide and is available in seven languages. It explains the SI redefinition and its importance to our world. Also, explore other visual resources that you can share with your friends and colleagues!
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