Physical Reference Data

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The NIST Reference on Constants, 
Units and Uncertainty Information at the foundation of modern science and technology from the Physical Measurement Laboratory of NIST.

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Detailed contents
Fundamental Physical Constants
International System of Units (SI)
Uncertainty of Measurement Results
    Guidelines for the expression of uncertainty in measurement



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NIST: National Institute of Standards and Technology NIST Physical Measurement LaboratoryPhysical Reference Data
Online: February 1998  -   Last update: December 12, 2017
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