The NIST Reference on Constants, Units and UncertaintyInformation at the foundation of modern science and technology from the Physics Laboratory of NIST

SI Units
Constants,
Units &
Uncertainty
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Essentials of the SI
Introduction
SI units and prefixes
Units outside the SI
Rules and style conventions

Background
Definitions of the SI base units and their historical context
International aspects of the SI
Unit conversions

Bibliography
Online publications and citations

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Online: February 1998 - Last update: October 2000