The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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nuclear magneton in inverse meter per tesla
 $\mu_{\rm N}/hc$
 Numerical value  2.542 623 413 53 x 10-2 m-1 T-1
 Standard uncertainty  0.000 000 000 78 x 10-2 m-1 T-1
  Relative standard uncertainty  3.1 x 10-10
 Concise form  2.542 623 413 53(78) x 10-2 m-1 T-1    
The full description of unit m-1 is cycles or periods per meter.
 
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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