The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Energy
Equivalents
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Constants
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Constants,
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Constants in the category " Frequently used constants "...

atomic mass constant
Avogadro constant
Boltzmann constant
conductance quantum
electron mass
electron volt
elementary charge
Faraday constant
fine-structure constant
inverse fine-structure constant
Josephson constant
magnetic flux quantum
molar gas constant
Newtonian constant of gravitation
Planck constant
proton mass
proton-electron mass ratio
reduced Planck constant
Rydberg constant times c in Hz
Stefan-Boltzmann constant
vacuum electric permittivity
vacuum magnetic permeability
von Klitzing constant


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