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

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: June 25 2015
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