Physical Constant - Table of Universal Constants

Table of Universal Constants

Quantity Symbol Value Relative Standard Uncertainty
speed of light in vacuum 299 792 458 m·s−1 defined
Newtonian constant of gravitation 6.67384(80)×10−11 m3·kg−1·s−2 1.2 × 10−4
Planck constant 6.626 069 57(29) × 10−34 J·s 4.4 × 10−8
reduced Planck constant 1.054 571 726(47) × 10−34 J·s 4.4 × 10−8

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