Physical constant

Quantity	Symbol	Value
permeability of vacuum	μ	4π x 10-7 H.m-1 (defined)
speed of light in vacuum	c0	299 792 458 m.s-1 (defined)
permittivity of vacuum	ε0 = 1/μ0c02	8.854 187 816 ... x 10-12 F.m-1
Planck's constant	h	6.626 075 5(40) x 10-34 J.s
	h_strikethrough = h/2π	1.054 572 66(63) x 10-34 J.s
elementary charge	e	1.602 177 33(49) x 10-19 C
electron rest mass	me	9.109 389 7(54) x 10-31 kg
proton rest mass	mp	1.672 623 1(10) x 10-27 kg
neutron rest mass	mn	1.674 928 6(10) x 10-27 kg
atomic mass constant, (unified atomic mass unit)	mu = 1u	1.660 540 2(10) x 10-27 kg
Avogadro constant	L, NA	6.022 136 7(36) x 1023 mol-1
Boltzmann constant	k	1.380 658(12) x 10-23 J.K-1
Faraday constant	F	9.648 530 9(29) x 104 C.mol-1
gas constant	R	8.314 510 (70) J.K-1.mol-1
zero of the Celsius scale		273.15 K (defined)
molar volume, ideal gas, p = 1 bar, θ = 00C		22.711 08(19) L.mol-1
standard atmosphere	atm	101 325 Pa (defined)
fine structure constant	α = μ0e2c0/2h	7.297 353 08(33) x 10-3
	α-1	137.035 989 5(61)
Bohr radius	a0	5.291 772 49(24) x 10-11 m
Hartree energy	Eh	4.359 748 2(26) x 10-18 J
Rydberg constant	Rinfinity	1.097 373 153 4(13) x 10-7 m-1
Bohr magneton	μB	9.247 015 4(31) x 10-24 J.T-1
electron magnetic moment	μe	9.284 770 1(31) x 10-24 J.T-1
Lande g-factor for free electron	ge	2.002 319 304 386(20)
nuclear magneton	μN	5.050 786 6(17) x 10-27 J.T-1
proton magnetic moment	μp	1.410 607 61(47) x 10-26 J.T-1
proton magnetogyric ratio	γp	2.675 221 28(81) x 108 s-1.T-1
magnetic moment of protons in H20, μ'p	μ'p/μB	1.520 993 129(17) x 10-3
proton resonance frequency per field in H20	γ'p/2π	42.576 375 (13) M.Hz.T-1
Stefan-Boltzmann constant	σ	5.670 51(19) x 10-8 W.m-2.K-4
first radiation constant	c1	3.741 774 9(22) x 10-16 W.m2
second radiation constant	c2	1.438 769 (12) x 10-2 m.K
gravitational constant	G	6.672 59(85) x 10-11 m3.kg-1.s-2
standard acceleration of free fall	gn	9.80665 m.s-2 (defined)