
Fundamental physical constants
Quantity
Electron charge
Permittivity of vacuum
Speed of light
Planck's constant
Electron mass
Neutron mass
Boltzmann's constant
Avogadro's constant
Rydberg
Bohr radius
Bohr magneton
Fine structure constant
Magnetic flux quantum
von Klitzing constant
Josephson constant
e
£0
c
h
h
m
m„
k
B
N
A
/?oo
a
0
ßB
a
$0
RK
KJ
CGS
4.803 207-10"
lu
2.997 925
•
10
10
1.054 572-10"
27
6.582
118-10"
16
6.626
069-10"
27
4.135 667-10"'
5
9.109 382- 10"
28
1.674 927 10~
24
1.380 650-10-'
6
8.617 385-10"
5
6.022
141 -10
23
13.605 692
h /me
2
0.529
177- 10"
8
eh/2mc
9.274
009- 10"
21
e
2
/Hc
7.297
353
•
10"
3
hc/e
4.135 667-10"
7
h/e
1
2.872 062 -10"
8
2e/h
1.449 790-10
17
esu
cm s
-
'
ergs
eVs
ergs
eVs
gm
gm
ergK"
1
eVK"'
mol
-
'
eV
cm
ergG
-
'
Gem
2
statohm
esu erg"' s
SI
1.602 176 10-
|V
8.854
187-10"'
2
2.997 925
•
10
8
1.054 572-10"
34
6.582
118-lO"'
6
6.626
069-10"
34
4.135 667- lO"
15
9.109 382-10"
31
1.674 927-10"
27
1.380 650-10"
23
8.617 385- lO"
5
6.022
141
•
10
23
13.605 692
4ireoh
/1
/me
2
0.529
177-10"
10
eh/lm
9.274
009
-lO"
24
e
2
/4weohc
7.297
353
•
10"
3
h/e
4.135 667-10"
15
h/e
2
2.581 281-10
4
2e/h
-' 4.835 979-10'
4
C
C
2
J-'m-'
m s
-1
Js
eVs
Js
eVs
kg
kg
JK-'
evr'
mol"'
eV
m
JT~'
Tm
2
n
HzV"'
Source:
P.
J. Mohr, B. N. Taylor, and D. B. Newell (2008), CODATA recommended values
of the fundamental physical constants: 2006, Reviews of Modern Physics, 80 633-730; see
also physics . nist. go v/ con s tant s
Various conversion factors
8.987
554
3.335
640
1.602 177-
4.184-10
7
10~
8
1 s cm
-
'/statohm
1 cm erg/esu
2
1 G/(ergcm
-
'
10"
fi/statohm
10"'°
C/esu
10"'
2
erg/eV
erg/cal
cm/Â
esu
')
1.112 650-10~
2.997 925
•
10
9
6.242
197-10'
2.390-10"
8
10
8
1
1
1
12
statohm/(s cm"')
esu
2
/(cm erg)
erg cm"' esu
_
'/G
statohm/fi
esu/C
eV/erg
cal/erg
A/cm
All entries in the table equal unity.