Lehman, J.
, Migdall, A.
and Scherschligt, J.
(2024),
A proposal for three categories of units within the SI, Metrologia, [online], https://doi.org/10.1088/1681-7575/ad40af, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=957187
(Accessed October 27, 2025)
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.
A proposal for three categories of units within the SI
Published
Author(s)
, ,
Abstract
In this letter we examine the organization of the traditional base units and defining constants established in the 2019 redefinition of the international system of units (SI). For the next redefinition of the SI, which will accompany the anticipated redefinition of the second, we propose an organizational change to improve clarity while maintaining practicality. We propose three distinct categories of units: The first category comprises the four base-measurement units: The second, meter, kilogram, and ampere. The second contains physiologically-relevant derived units. The third category contains the remaining units derived from the base units.Citation
Metrologia
Volume
61
Pub Type
Journals
Download Paper
Keywords
International System of Units, SI, mol, kelvin, ampere, meter, second, kilogram, candela
Citation
Issues
If you have any questions about this publication or are having problems accessing it, please contact [email protected].
Created April 29, 2024, Updated April 22, 2025