News and Updates

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Metric Week 2023: Seven Days of SI Fun

September 20, 2023

National Metric Week (October 8 to 14, 2023) is an opportunity to underscore the usefulness of metric system measurements, formally known as the International

Photo collage of 2023 OWM SURF students Dinelka Jagoda, Benjamin Tran, Travis "TJ" White, and Bryan Rezende

Welcome 2023 NIST Summer Undergraduate Research Fellows!

June 30, 2023

The Office of Weights and Measures (OWM) welcomes four 2023 NIST Summer Undergraduate Research Fellowship (SURF) Program research fellows to our Gaithersburg

NIST Metric Kitchen: Educational Website Launched

March 31, 2023

The NIST Office of Weights and Measures (OWM) Metric Program invites you to see what’s cooking in the NIST Metric Kitchen, a new educational website that

SI Prefix Progress

January 4, 2023

In December 2022, the BIPM SI Brochure (9 th Edition, December 2022, V2.01) was published to include the four new International System of Units (SI) prefixes

In-Person Training for Mulch and Soil Testing at the WWMA Annual Meeting

September 27, 2022

Now that we are attending meetings in-person again, this presents an opportunity for OWM staff to provide some of our training directly to our stakeholders

Graphic Image of Weights and Measurements Featured Collection

Discover NIST Education Resources!

March 27, 2022

The National Institute of Standards and Technology (NIST) invites learners of all ages to explore and discover a wide variety of Science, Technology

World Metrology Day Poster Graphic Image

Celebrate World Metrology Day on May 20

March 26, 2022

“World Metrology Day is an annual celebration of the signature of the Meter Convention on 20 May 1875 by representatives of seventeen nations. The Convention

Updates to Fundamental Constants Reflect Redefinition of International System of Units

December 16, 2021

The CODATA Task Group on Fundamental Constants recently produced its 2018 update of a self-consistent set of internationally recommended values of the basic

Person holding wallet card showing the values of fundamental constants being used for revising the International System of Units, the modern metric system.

Bringing the World Closer to Revised Measurement System, Scientists Update Four Key Fundamental Constants

October 23, 2017

Paving the way for transforming the world’s measurement system, an international task force has determined updated values for four fundamental constants of

NIST's Newest Watt Balance Brings World One Step Closer to New Kilogram

June 21, 2016

A high-tech version of an old-fashioned balance scale at the National Institute of Standards and Technology (NIST) has just brought scientists a critical step

SI Superheroes Return with Another Weighty Adventure

February 2, 2016

The nefarious Major Uncertainty has kidnapped Monsieur Kilogram, putting the world's measurements of mass in jeopardy. As the world spirals into " Mass Hysteria

The League of SI Superheroes is Running Out of Time!

May 29, 2015

The League of SI Superheroes is back! Working from their not-terribly-secret HQ at the National Institute of Standards and Technology (NIST), the cartoon heroes

Introducing the League of SI Superheroes: The New Champions of Metric

October 6, 2014

To celebrate Metric Week (Oct. 5-11), the National Institute of Standards and Technology would like to introduce you to the League of SI Superheroes. The League

New Value for the Planck Constant May Hasten Electronic Kilogram

January 14, 2014

After two years of difficult and meticulous work examining, refurbishing, and testing the aging workhorse watt balance called NIST-3, PML researchers have used

Redefining the SI Base Units

November 2, 2011

Note: Much more recent information is available about redefinition of the SI units. For a comprehensive general overview, see How to Weigh Everything from

Metric Week Begins 10/10/10!

September 28, 2010

Every day is a metric day at the National Institute of Standards and Technology (NIST). But that won't stop the agency from celebrating Metric Week, held

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