Taking the first steps of what would be a major historical advance in the science of measurement, the U.S. National Institute of Standards and Technology is participating in a worldwide effort to ...

Weighty matters: a platinum-iridium kilogram belonging to the US National Institute of standards and Technology. (Courtesy: J.L. Lee/NIST) Metrologists and policy-makers from 60 countries around the ...

October 18, 2010 marked the 50th anniversary of the International System of Units, also known as the SI System. Resolution 12 of the 11th meeting of the CGPM (1960) established the system as the world ...

New prefixes for the world’s largest and smallest numbers have been confirmed by a vote at the General Conference on Weights and Measures (CGPM) in Versailles, France, on Friday. The suggested ...

A new definition of the kilogram is required, an international team of scientists contends. The current one is imprecise, they say, because it is not linked to an unvarying property of nature. The ...

This Discussion Meeting will review the relation of the International System of Units to the fundamental constants of physics and progress towards the redefinitions.

For the first time in more than 30 years, new terms have been officially added to the International System of Units (SI). The four new prefixes – ronna, quetta, ronto and quecto – describe very large ...

A metric prefix is a numerical multiplier that is placed before a basic unit of measure to indicate a specified multiple or fraction of that unit. The 20 recognized metric prefixes have been specified ...

What unit of measurement should be used for specific reports? Whether printing out a check register or calculating square footage, using the correct team is essential. A size mistake can lead to ...