The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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vacuum magnetic permeability
 $ \mu_0 = 4\rmpi\alpha \hbar/(e^2 c) $
 Numerical value  1.256 637 061 27 x 10-6 N A-2
 Standard uncertainty  0.000 000 000 20 x 10-6 N A-2
  Relative standard uncertainty  1.6 x 10-10
 Concise form  1.256 637 061 27(20) x 10-6 N A-2    
 
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

 
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