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4.835 978 70(11) × −8
Josephson constant 10 Hz·V 2.2 × 10
14
−1
2.067 833 758(46) ×
−8
magnetic flux quantum −15 2.2 × 10
10 Wb
5.050 783 53(11) ×
−8
nuclear magneton 10 −27 J·T 2.2 × 10
−1
25 812.807 4434(84)
von Klitzing constant Ω 3.2 × 10 −10

Table of atomic and nuclear constants

Quantity
Relative
 v Value [7][8] (SI
Symbol Standard
 t units)
Uncertainty
 e

5.291 772
−9
Bohr radius 1092(17) × 10 −11 3.2 × 10
m
2.817 940
classical −15 −10
electron radius 3267(27) × 10 9.7 × 10
m
9.109 382 91(40) −8
electron mass × 10 −31 kg 4.4 × 10

Fermi
1.166 364(5) ×
−6
coupling 10 GeV 4.3 × 10
−5
−2
constant
fine-structure 7.297 352 −10
−3 3.2 × 10
constant 5698(24) × 10
4.359 744 34(19) −8
Hartree energy × 10 −18 J 4.4 × 10

1.672 621
−8
proton mass 777(74) × 10 −27 4.4 × 10
kg
3.636 947
quantum of 5520(24) × 10 6.5 × 10 −10
−4
circulation −1
m² s

Rydberg 10 973 731.568 5.0 × 10 −12
−1
constant 539(55) m
Thomson 6.652 458 −9
cross section 734(13) × 10 −29 1.9 × 10

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