E-34
Note: Physical constants and metric conversions are
based on the 2006 CODATA recommended
values, or on the 1995 Edition of the “Guide for
the Use of the International System of Units (SI)”
released by NIST (National Institute of Standards
and Technology).
No.
Constant
Symbol
Unit
01 Speed of light in vacuum
c
,
c
0
m s
–1
02 Newtonian constant of gravitation
G
m
3
kg
–1
s
–2
03 Standard acceleration of gravity
g
n
m s
–2
04 Electron mass
m
e
kg
05 Proton mass
m
p
kg
06 Neutron mass
m
n
kg
07 Muon mass
m
μ
kg
08 Atomic mass unit-kilogram
relationship
1
u
kg
09 Elementary charge
e
C
10 Planck constant
h
J s
11 Boltzmann constant
k
J K
–1
12 Magnetic constant
μ
0
N A
–2
13 Electric constant
ε
0
F m
–1
14 Classical electron radius
r
e
m
15 Fine-structure constant
α
16 Bohr radius
a
0
m
17 Rydberg constant
R
∞
m
–1
18 Magnetic fl ux quantum
Φ
0
Wb
19 Bohr magneton
μ
B
J T
–1
20 Electron magnetic moment
μ
e
J T
–1
21 Nuclear magneton
μ
N
J T
–1
22 Proton magnetic moment
μ
p
J T
–1
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