The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Click symbol for equation
molar mass constant
 $M_{\rm u}$
 Numerical value  1.000 000 001 05 x 10-3 kg mol-1
 Standard uncertainty  0.000 000 000 31 x 10-3 kg mol-1
  Relative standard uncertainty  3.1 x 10-10
 Concise form  1.000 000 001 05(31) x 10-3 kg mol-1    
 
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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