The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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alpha particle molar mass
 $M({\rm \alpha}),M_{\rm \alpha}$
 Value  4.001 506 179 127 x 10-3 kg mol-1
 Standard uncertainty  0.000 000 000 063 x 10-3 kg mol-1
  Relative standard uncertainty   1.6 x 10-11
 Concise form  4.001 506 179 127(63) x 10-3 kg mol-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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