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Avogadro constant Avogadro constant	Avogadro"s Number - American Chemical Society National Historic Chemical Landmark. The number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 10"23.
Boltzmann constant Boltzmann constant	Department of Molecular Biology | Princeton University The Department of Molecular Biology at Princeton University provides a vibrant and collaborative environment for research and education in the life sciences.
electron mass electron mass
elementary charge elementary charge
elementary charge over h elementary charge over h
Faraday constant Faraday constant
fine-structure constant fine-structure constant
inverse fine-structure constant inverse fine-structure constant	magnetic flux quantum magnetic flux quantum
molar gas constant molar gas constant	molar Planck constant times c molar Planck constant times c
Newtonian constant of gravitation Newtonian constant of gravitation	NIST Fundamental Physical Constants A comprehensive resource for the fundamental physical constants, provided by the National Institute of Standards and Technology (NIST).
permeability of vacuum permeability of vacuum	permittivity of vacuum permittivity of vacuum
Planck constant Planck constant	Planck constant over 2 pi Planck constant over 2 pi
proton mass proton mass	proton-electron mass ratio proton-electron mass ratio
Rydberg constant Rydberg constant	Rydberg constant times c in Hz Rydberg constant times c in Hz
speed of light in vacuum speed of light in vacuum	Stefan-Boltzmann constant Stefan-Boltzmann constant