The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
Topics:
Values
Energy
Equivalents
Searchable
Bibliography
Background
Constants
Bibliography
Constants,
Units &
Uncertainty
home page
[skip navigation]
speed of light in vacuum
 $c$
 Numerical value  299 792 458 m s-1
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  299 792 458 m s-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
Go to a new search