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SCIENCE POWERHOUSE ARTICLES MATH POWERHOUSE

Universal, Electromagnetic, Atomic and Nuclear Constants

Table of universal constants

Quantity	Symbol	Value	Relative Standard Uncertainty
speed of light in vacuum	C	299 792 458 m·s⁻¹	defined
Newtonian constant of gravitation	G	6.67428(67)×10⁻¹¹ m³·kg⁻¹·s⁻²	1.0 × 10⁻⁴
Planck constant	h	6.626 068 96(33) × 10^-34 J·s	5.0 × 10⁻⁸
reduced Planck constant	= h/(2Π)	3.313 034 48π^-1 × 10^-34 J·s = 1.054 571 628(53) × 10⁻³⁴ J·s	5.0 × 10⁻⁸