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
inverse fine-structure constant
 $\alpha^{-1}$
 Numerical value  137.035 999 177
 Standard uncertainty    0.000 000 021
  Relative standard uncertainty  1.6 x 10-10
 Concise form  137.035 999 177(21)    
 
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