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Number Constant Name Symbol
10 fine-structure constant α
11 classical electron radius re
12 electron Compton wavelength λ
c
13 proton gyromagnetic ratio γ
p
14 proton Compton wavelength λ
cp
15 neutron Compton wavelength λ
cn
16 Rydberg constant R∞
17 atomic mass unit u
18 proton magnetic moment
µ
p
19 electron magnetic moment
µ
e
20 neutron magnetic moment
µ
n
21 muon magnetic moment
µ
µ
22 Faraday constant F
23 elementary charge e
24 Avogadro constant NA
25 Boltzmann constant k
26 molar volume of ideal gas Vm
27 molar gas constant R
28 speed of light in vacuum C
0
29 first radiation constant C
1
30 second radiation constant C
2
31 Stefan-Boltzmann constant σ
32 permittivity of vacuum ε
0
33 permeability of vacuum
µ
0
34 magnetic flux quantum
φ
0
35 standard acceleration of gravity g
36 astronomical unit AU
37 parsec pc
38 Celsius temperature t
39 Newtonian constant of gravitation G
40 standard atmosphere atm
Base-n Calculations
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