Table of Constants

Fundamental constants from NIST Physics Lab
Name	Symbol	Value	Units	Relative Uncertainty
Speed of light (in vacuum)	$c$	$299\ 792\ 458$	$\mathrm {m} \ \mathrm {s} ^{-1}$	(exact)
Magnetic constant	$\mu _{0}$	$4\pi \times 10^{-7}\approx$	$\mathrm {N} \ \mathrm {A} ^{-2}$	(exact)
Electric constant	$\epsilon _{0}$	$1/(\mu _{0}c^{2})\approx$	$\mathrm {F} \ \mathrm {m} ^{-1}$	(exact)
Newtonian gravitational constant	$G$	$6.674\ 2(10)\times 10^{-11}$	$\mathrm {m} ^{3}\ \mathrm {kg} ^{-1}\ \mathrm {s} ^{-2}$	$1.5\times 10^{-4}$
Plank's constant	$h$	$6.626\ 069\ 3(11)\times 10^{-34}$	$\mathrm {J} \ \mathrm {s}$	$1.7\times 10^{-7}$
Elementary charge	$e$	$1.602\ 176\ 53(14)\times 10^{-19}$	$\mathrm {C}$	$8.5\times 10^{-8}$
Mass of the electron	$m_{e}$	$9.109\ 382\ 6(16)\times 10^{-31}$	$\mathrm {kg}$	$1.7\times 10^{-7}$
Mass of the proton	$m_{p}$	$1.672\ 621\ 71(29)\times 10^{-27}$	$\mathrm {kg}$	$1.7\times 10^{-7}$
Mass of a neutron	$m_{n}$
Fine structure constant	$\alpha =e^{2}/(2\epsilon _{0}hc)$	$7.297\ 352\ 568(24)\times 10^{-3}$	dimentionless	$3.3\times 10^{-9}$
Molar gass constant	$R$	$8.314\ 472(15)$	$\mathrm {J} \ \mathrm {mol} ^{-1}\ \mathrm {K} ^{-1}$	$1.7\times 10^{-6}$
Boltzmann's constant	$k$	$1.380\ 650\ 5(24)$	$\mathrm {J} \ \mathrm {K} ^{-1}$	$1.8\times 10^{-6}$
Avogadro's number	$N_{A}$	$6.022\ 141\ 5(10)\times 10^{23}$	$\mathrm {mol} ^{-1}$	$1.7\times 10^{-7}$
Rydberg constant	$R_{\infty }$	$10\ 973\ 731.568\ 525(73)$	$\mathrm {m} ^{-1}$	$6.6\times 10^{-12}$
Atmosphere	$\mathrm {atm}$	$101325$		(exact)
Electronvolt	$\mathrm {eV}$	$1.60\times 10^{-19}$
Bohr radius	$a_{0}$	$5.292\times 10^{-11}$
Coulomb's constant	$k$	${\frac {1}{4\pi \epsilon _{0}}}\approx$
Faraday constant	$F$	$e\times N_{A}\approx$
Gravitational acceleration on Earth	$g$
Mass of the Earth
Mass of the Moon
Mean radius of the Earth
Mean radius of the Moon
Dirac's Constant	$\hbar$
Speed of sound in air at STP
Unified Atomic Mass Unit	$u$
Vacuum Permittivity	$\epsilon _{0}$