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
 $m_{\rm e}c$
 Value  2.730 924 488 x 10-22 kg m s-1
 Standard uncertainty  0.000 000 034 x 10-22 kg m s-1
  Relative standard uncertainty   1.2 x 10-8
 Concise form  2.730 924 488(34) x 10-22 kg m s-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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