Values given below contain the (uncertainty) in the last two decimal places given in brackets. Values that do not have this uncertainty listed are exact. For example:
mu
= 1.66053873(13) x 10-27 kg
mu
= 1.66053873 x 10-27 kg
Uncertainty in mu
= 0.00000013 x 10-27 kg
Name
Symbol
Value
Atomic Mass Unit
mu
1.66053873(13) x 10-27 kg
Avogadro's Number
NA
6.02214199(47) x 1023 mol-1
Bohr Magneton
B
9.27400899(37) x 10-24 J T-1
Bohr Radius
ao
0.5291772083(19) x 10-10 m
Boltzmann's Constant
k
1.3806503(24) x 10-23 J K-1
Compton Wavelength
c
2.426310215(18) x 10-12 m
Deuteron Mass
md
3.34358309(26) x 10-27 kg
Electric Constant
o
8.854187817 x 10-12 F m-1
Electron Mass
me
9.10938188(72) x 10-31 kg
Electron-Volt
eV
1.602176462(63) x 10-19 J
Elementary Charge
e
1.602176462(63) x 10-19 C
Faraday Constant
F
9.64853415(39) x 104 C mol-1
Fine Structure Constant
7.297352533(27) x 10-3
Hartree Energy
Eh
4.35974381(34) x 10-18 J
Hydrogen Ground State
13.6057 eV
Josephson Constant
Kj
4.83597898(19) x 1014 Hz V-1
Magnetic Constant
o
4 x 10-7
Molar Gas Constant
R
8.314472(15) J K-1 mol-1
Natural Unit of Action
1.054571596(82) x 10-34 J s
Newtonian Constant of Gravitation
G
6.673(10) x 10-11 m3 kg-1 s-2
Neutron Mass
mn
1.67492716(13) x 10-27 kg
Nuclear Magneton
n
5.05078317(20) x 10-27 J T-1
Planck Constant
h
6.62606876(52) x 10-34 J s h = 2
Planck Length
lp
1.6160(12) x 10-35 m
Planck Mass
mp
2.1767(16) x 10-8 kg
Planck Time
tp
5.3906(40) x 10-44 s
Proton Mass
mP
1.67262158(13) x 10-27 kg
Rydberg Constant
RH
10 9.73731568549(83) x 105 m-1
Stefan Boltzmann Constant
5.670400(40) x 10-8 W m-2 K-4
Speed of Light in Vacuum
c
2.99792458 x 108 m s-1
Thompson Cross Section
e
0.665245854(15) x 10-28 m2
Wien Displacement Law Constant
b
2.8977686(51) x 10-3 m K
Source:
CODATA Recommended Values of the Fundamental Physical Constants: 1998
by Peter J. Mohr and Barry N. Taylor
National Institute of standards and Technology, Gaithersburg, MD 20899-8401
'I beseech you to take interest in these sacred domains so expressively called laboratories. Ask that there be more and that they be adorned for these are the temples of the future, wealth and well-being. It is here that humanity will grow, strengthen and improve. Here, humanity will learn to read progress and individual harmony in the works of nature, while humanity's own works are all too often those of barbarism, fanaticism and destruction.'