The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
Topics:
Values
Energy
Equivalents
Searchable
Bibliography
Background

Constants
Bibliography

Constants,
Units &
Uncertainty
home page
Links to selected scientific data

 Metric/SI   The SI, in-depth information on the modern metric system NIST
 Mathematical   Values with descriptions by topic or value Mathsoft
Software company
 Elementary
 particle
Properties, information, databases Particle Data Group
 Atomic Spectroscopic data including atomic energy levels, wavelengths,
transition probabilities
NIST
 Nuclear Relative atomic masses and related nuclear data AMDC
Centre de spectrométrie nucléaire et de spectrométrie de masse
 Chemical NIST WebBook of thermochemistry, spectra, etc NIST
Periodic Table WebElements
University of Sheffield , UK
Mineral formulas, classifications, pictures Athena Project
 Astronomical   Planet and moon statistics from "The Nine Planets" SEDS
Lunar and Planetary Laboratory, Univ. Arizona, Tucson, USA
 Unit conversions   Links to non-endorsed on-line unit conversions Outside of NIST

See also
     Values of the constants
     Searchable bibliography on the constants
     Background information related to the constants

 

 
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