NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Elementary Again

Published

Author(s)

Mark W. Keller

Abstract

Mark Keller explains how the elementary charge will soon be reinstated in metrology - and why it got sidelined in the first place.
Citation
Nature Physics
Volume
14
Pub Type
Journals

Download Paper

https://doi.org/10.1038/s41567-018-0108-x
Local Download

Keywords

electron charge, elementary charge, SI units, cathode rays, J.J. Thomson, Robert Millikan, oil drop method, metrology, quantum electrical standards, voltage, resistance, Josephson, quantum Hall effects, e, electrical metrology, Stoney’s atom
Electron physics

Citation

Keller, M. (2018), Elementary Again, Nature Physics, [online], https://doi.org/10.1038/s41567-018-0108-x (Accessed October 10, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created April 5, 2018, Updated July 15, 2020
Was this page helpful?