E-35
No. Constant Symbol Unit
23 Neutron magnetic moment
μ
n
J
T
–1
24 Muon magnetic moment
μ
μ
J
T
–1
25 Compton wavelength
λ
c
m
26 Proton Compton wavelength
λ
c
,
p
m
27 Stefan-Boltzmann constant
σ
W
m
–2
K
–4
28 Avogadro constant
N
A
, L
mol
–1
29 Molar volume of ideal gas
(273.15K, 101.325kPa)
V
m
m
3
mol
–1
30 Molar gas constant
R
J mol
–1
K
–1
31 Faraday constant
F
C
mol
–1
32 Von Klitzing constant
R
K
Ω
33
Electron charge to mass quotient
–e/m
e
C
kg
–1
34 Quantum of circulation
h/2m
e
m
2
s
–1
35 Proton gyromagnetic ratio
γ
p
s
–1
T
–1
36 Josephson constant
K
J
Hz
V
–1
37 Electron volt
eV
J
38 Celsius Temperature
t
K
39 Astronomical unit
AU
m
40 Parsec
pc
m
41 Molar mass of carbon-12
M
(
12
C)
kg
mol
–1
42 Planck constant over 2 pi
h
-
J s
43 Hartree energy
E
h
J
44 Conductance quantum
G
0
s
45 Inverse fi ne-structure constant
α
–1
46 Proton-electron mass ratio
m
p
/m
e
47 Molar mass constant
M
u
kg
mol
–1
48 Neutron Compton wavelength
λ
c
,
n
m
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