Fundamental
Physical Constants
Engineering, Physics,
Astronomy, Chemistry etc. |
| Constant
|
Value
|
Units
|
Definition
|
|
Astronomical Unit AU |
1.495 978 7 e11
|
m
|
Mean Sun-Earth distance |
|
Alpha |
7.297 352 81 e-03
|
µ0
c e2/h
|
Fine Structure Constant |
|
AMU Chemical |
1.660 260 00 e-27
|
kg
|
1/16 of the weighted average mass of
the 3 naturally occuring neutral isotopes
of oxygen. |
|
AMU Physical |
1.659 810 00 e-27
|
kg
|
1/16 of the mass of a neutral oxygen
16 atom. |
|
Atomic Mass Unit |
1.660 540 2 e-27
|
kg
|
Atomic mass unit (defined to be 1/12
of the mass of carbon 12) |
|
Avogadro Number NA |
6.022 136 7 e23
|
particles/mol
|
Number of particles in 1 mole of substance |
|
Bohr Radius a0 |
5.291 772 1 e-11
|
alpha/pi R
|
|
|
Boltzman Constant k |
1.380 658 e-23
|
J/K
|
Boltzmann constant |
|
Coulomb Constant |
6.954 063 e-12
|
pi epsilon0
|
Listed as "k" sometimes |
|
Dalton |
1.660 540 2 e-27
|
µ
|
|
|
Electron Rest Mass me |
9.109 389 7 e-31
|
kg
|
Particle mass |
|
Proton Rest Mass mp |
1.672 623 1 e-27
|
kg
|
Particle mass |
|
Neutron Rest Mass mn |
1.674 928 6 e-27
|
kg
|
Particle mass |
|
Muon Rest Mass mm |
1.883 532 7 e-28
|
kg
|
Particle mass |
|
Deuteron Rest Mass md |
3.343 586 e-27
|
kg
|
Particle mass |
|
Electron rest energy mec2 |
8.187 111 2 e-14
|
J
|
|
|
Elementary Charge e |
1.602 177 3 e-19
|
C
|
Elementary charge |
|
Electron Charge-Mass ratio e/me |
1.758 819 6 e11
|
C/kg
|
|
|
Energy |
8.987 551 8 e16
|
c2
|
Convert mass to energy |
|
Faraday Constant F |
9.648 46 e4
|
NA e
|
|
|
Fine Structure Constant (alpha) |
7.297 352 81 e-3
|
µ0
c e2/h
|
Fine Structure Constant |
|
Gravitational Constant |
6.687 3 e-11
|
N m2/kg2
|
Newtonian gravity constant |
|
Gas Constant R |
8.314 51
|
J/mol K
|
Molar gas constant |
|
Hartree |
2.625 501 e6
|
J/mol
|
Atomic energy unit = e2/(4 pi epsilon0a0) |
|
Light Speed |
2.997 924 58 e8
|
m/s
|
|
|
Molar Volume |
2.241 41 e-2
|
m3/kmol
|
Volume occupied by one mole of an ideal
gas at standard temperatureand pressure. |
|
Mole |
1.0
|
mol
|
Amount of substance of a system which
contains as many elementary entities
as atoms in 0.012 kg of unbound carbon
12 atoms, at rest and in the ground
state. |
|
PI |
3.141 592 7
|
pi
|
|
|
Permeability of vacuum µ0 |
1.256 637 06 e-6
|
T2 m2/J
|
|
|
Permittivity of vacuum (epsilon0) |
8.854 187 817 e-12
|
C2/Jm
|
Permittivity of vacuum, epsilon0
= 1/(µ0c2)
(exact) |
|
Planck Constant h |
6.626 075 5 e-34
|
J s
|
Action of one joule over one second |
|
Prout |
2.972 04 e-14
|
keV
|
Nuclear binding energy equal to 1/12
binding energy of the deuteron |
|
Rydberg Constant R |
1.097 373 2 e7
|
/m
|
|
|
Speed of Light c |
2.997 924 58 e8
|
m/s
|
Speed of light in a vacuum(exact) |
|
Standard Temperature |
2.731 5 e2
|
K
|
Standard temperature |
|
Unified Mass Unit |
1.660 43 e-27
|
kg
|
|
