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Quantity	Symbol	Value	Units	Relative Uncertainty (ppm)
Speed of light in Vacuum	c	299 792 458	Ms^-1	(exact)
Permeability of vacuum	µ₀	4p×10^-7=12.566 370614 …	NA^-210^-7 NA^-2	(exact)
Permittivity of vacuum	e₀	1/µ₀c²=8.854 187 817 …	10^-12Fm^-1	(exact)
Newtonian constant of gravitation	G	6.672 59	10^-11m³kg^-1s^-2	128
Planck constant	h	6.626 0755	10^-34Js	0.60
h/2p	h	1.054 572 66	10^-34Js	0.60
Elementary charge	e	1.602 177 33	10^-19C	0.30
Magnetic flux quantum,h/2e	?₀	2.067 834 61	10^-15Wb	0.30
Electron mass	m_e	9.109 3897	10^-31kg	0.59
Proton mass	m_p	1.672 6231	10^-27kg	0.59
Proton-electron mass ratio	m_p/m_e	1836.152701		0.020
Fine-structure constant,µ₀ce²/2h	a	7.297 353 08		0.045
Inverse fine-structure constant	a^-¹	137 035 9895	10^-3	0.045
Rydberg constant, m_eca²/2h	R8	10 973 731.534	m^-1	0.0012
Avogadro constant	N_AL	6.022 1367	10²³mol^-1	0.59
Faraday constant, N_Ae	F	96 485.309	C mol^-1	0.30
Molar gas constant	R	8.314 510	J mol^-1K^-1	8.40
Boltzmann constant, R/N_A	k	1.380 658	10^-23JK^-1	8.50
Stafan-Boltzmann constant, (p²/60)k⁴/h³c²	s	5.670 51	10^-8Wm^-2K^-4	34
Non-SI units used with SI Electronvolt, (e/C)J = {e}J (Unified) atomic mass unit, 1u=m_u= 1/12m(¹²C)	eV u	1.602 17733 1.660 5402	10^-19J 10^-27kg	0.30 0.59