The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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tau molar mass
 $  M({\rm\tau}) = N_{\rm A} m_{\rm\tau}  $
 Numerical value  1.907 54 x 10-3 kg mol-1
 Standard uncertainty  0.000 13 x 10-3 kg mol-1
  Relative standard uncertainty  6.8 x 10-5
 Concise form  1.907 54(13) x 10-3 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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