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Constants
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Physics
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Astronomical
Electricity
ElectroMagnetism
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Gravitational
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Physical-Chemical
Subatomic Particles
Universal
NAME
SYMBOL
VALUE
10
-10
m
Absolute Entropy Constant
S
0
/R
-1.1517048(44)
-1.1648678(44)
Acceleration of Free Fall on Earth
g
9.80665 m s
-2
32.1740 ft s
-2
Atomic Mass Unit
amu
m
u
u
1.66053873(13) × 10
-27
kg
931.494013(37) MeV
1.49241778(12) × 10
-10
J
Avogadro Constant
N
A
6.02214199(47) × 10
23
mol
-1
Bohr Magneton
µ
B
9.27400899(37) × 10
-24
J T
-1
5.788381749(43) × 10
-5
eV T
-1
1.399624624(56) × 10
Bohr Radius
a
0
5.291772083(19) × 10
-11
m
Boltzmann Constant
k
1.3806503(24) × 10
-23
J K
-1
8.617342(15) × 10
-5
eV K
-1
2.0836644(36) × 10
10
Characteristic Impedence of Vacuum
Z
0
376.730313461 Ω
Charge to Mass Quotient, Electron
-e/m
e
-1.758820174(71) × 10
11
C kg
-1
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