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Table of universal constants

Quantity

 v Symbol Value [7][8] Relative Standard
 t Uncertainty
 e

speed of light in 299 792 458 m·s defined
−1
vacuum
Newtonian
−1 −2
−4
3
constant of 6.67384(80)×10 −11 m ·kg ·s 1.2 × 10
gravitation
−8
Planck constant 6.626 069 57(29) × 10 −34 J·s 4.4 × 10
reduced Planck 1.054 571 726(47) × 10 −34 J·s 4.4 × 10
−8
constant

Table of electromagnetic constants

Quantity

 v Relative Standard
Symbol Value (SI units)
 t Uncertainty
 e

−7 −2
4π × 10 N·A =
magnetic constant 1.256 637 061... × 10 defined
−6
(vacuum permeability) −2
N·A
electric constant 8.854 187 817... × defined
−1
(vacuum permittivity) 10 −12 F·m
characteristic 376.730 313 461... Ω defined
impedance of vacuum
9
8.987 551 787... × 10
Coulomb's constant N·m²·C defined
−2
1.602 176 565(35) × −8
elementary charge 10 −19 C 2.2 × 10

9.274 009 68(20) ×
−8
Bohr magneton 10 −24 J·T 2.2 × 10
−1
7.748 091 7346(25) × −10
conductance quantum 10 S 3.2 × 10
−5

inverse conductance 12 906.403 7217(42) 3.2 × 10 −10
quantum Ω

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