The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron molar mass
 $M({\rm e}),M_{\rm e}$
 Numerical value  5.485 799 0962 x 10-7 kg mol-1
 Standard uncertainty  0.000 000 0017 x 10-7 kg mol-1
  Relative standard uncertainty  3.1 x 10-10
 Concise form  5.485 799 0962(17) x 10-7 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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