The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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Uncertainty
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Correlation coefficient between two constants
electron mass
 $m_{\rm e}$
 Numerical value  9.109 383 7015 x 10-31 kg
 Standard uncertainty  0.000 000 0028 x 10-31 kg
  Relative standard uncertainty  3.0 x 10-10
 Concise form  9.109 383 7015(28) x 10-31 kg    
 
Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
      Correlation coefficient with
any other constant

 
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