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 Search for many different chemical properties ChemFinder CambridgeSoft Software company 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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