The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
Units &
Uncertainty
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Click symbol for equation
magnetic constant
 $\mu_0$
 Value  4pi x 10-7 = 12.566 370 614... x 10-7 N A-2
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  4pi x 10-7 = 12.566 370 614... x 10-7 N A-2    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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