The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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molar Planck constant times c
 $N_{\rm A}hc$
 Value  0.119 626 565 582 J m mol-1
 Standard uncertainty  0.000 000 000 054 J m mol-1
  Relative standard uncertainty   4.5 x 10-10
 Concise form  0.119 626 565 582(54) J m mol-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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