NIST-4 Kibble balance - A machine with a clock on top of it
Summary
The NIST-4 Kibble balance, which began full operation in early 2015 at the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland, United States, measured Planck's constant to within 13 parts per billion in 2017, which was accurate enough to assist with the redefinition of the kilogram planned for 2019.
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Tags
metrology
watt balance
high resolution
ultra high resolution
national institute of standards and technology
Date
01/09/2015
Source
U.S. National Institute of Standards and Technology
Link
Copyright info
Public Domain