The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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vacuum magnetic permeability
 $\mu_0$
 Numerical value  1.256 637 062 12 x 10-6 N A-2
 Standard uncertainty  0.000 000 000 19 x 10-6 N A-2
  Relative standard uncertainty  1.5 x 10-10
 Concise form  1.256 637 062 12(19) x 10-6 N A-2    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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