The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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neutron molar mass
 $ M({\rm n}) = N_{\rm A}m_{\rm n} $
 Numerical value  1.008 664 917 12 x 10-3 kg mol-1
 Standard uncertainty  0.000 000 000 51 x 10-3 kg mol-1
  Relative standard uncertainty  5.1 x 10-10
 Concise form  1.008 664 917 12(51) 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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