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Physical Measurement Laboratory | NIST
PML is a world leader in the science of measurement. We determine the definitive methods for nearly every kind of measurement employed in commerce and research, provide NIST-traceable calibrations, an...
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Fundamental Physical Constants from NIST
The values of the fundamental physical constants provided at this site are recommended for international use by CODATA and are the latest available.
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International System of Units from NIST
Note The information on the SI below was current up until May 20, 2019 (World Metrology Day). Since then the SI has undergone major changes. Updated pages will soon become available. ...
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Atomic Weights and Isotopic Compositions for All Elements
Atomic Weights and Isotopic Compositions for All Elements
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SI Units | NIST
As of August 16, 2023 the physics.nist.gov historic SI Units site has permanently retired.
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Introduction to the Fundamental Physical Constants
Throughout all of the formulations of the basic theories of physics and their application to the real world, there appear again and again certain fundamental invariant quantities. These quantities, ca...