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]
Click symbol for equation
fine-structure constant
 $\alpha$
 Numerical value  7.297 352 5643 x 10-3
 Standard uncertainty  0.000 000 0011 x 10-3
  Relative standard uncertainty  1.6 x 10-10
 Concise form  7.297 352 5643(11) x 10-3    
 
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