Constants, parameters, ...

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• Constants of Nature (Planck, Boltzmann's, Elementary charge, ...)

• Convertions

• A Dictionary of Units

• Thermochemistry and Spectra database

• ' MatWeb Conversions' A useful unit conversor: http://www.matweb.com/tools/conversion.asp

• Platinum Group Metals properties

Lots of data on metals and alloys: [1] [2]

• Crystal structures: Calculated Cell parameters for some transition and noble metals. Crystal lattice prototypes [3]

• Rutile related structures