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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natural unit of momentum
 $m_{\rm e}c$
 Numerical value  2.730 924 530 75 x 10-22 kg m s-1
 Standard uncertainty  0.000 000 000 82 x 10-22 kg m s-1
  Relative standard uncertainty  3.0 x 10-10
 Concise form  2.730 924 530 75(82) x 10-22 kg m s-1    
 
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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