Values given below are from the CODATA 1998
recommended by the National Institute of Standards and
Technology of United States (NIST).
Values
contain the (uncertainty) in the last two decimal places
given in brackets. Values that do not have this
uncertainty listed are exact.
|
| 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 |
μB |
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 |
λc |
2.426310215(18) x 10-12
m |
| Deuteron Mass |
md |
3.34358309(26) x 10-27
kg |
| Electric Constant |
εo |
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 |
α |
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 |
μo |
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 |
μn |
5.05078317(20) x 10-27 J
T-1 |
| Planck Constant |
h |
6.62606876(52) x 10-34 J s |
| 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 |
σ |
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 |
σe |
0.665245854(15) x 10-28
m2 |
| Wien Displacement Law Constant |
b |
2.8977686(51) x 10-3 m K |
 |