The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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neutron mass energy equivalent
 $m_{\rm n}c^2$
 Numerical value  1.505 349 762 87 x 10-10 J
 Standard uncertainty  0.000 000 000 86 x 10-10 J
  Relative standard uncertainty  5.7 x 10-10
 Concise form  1.505 349 762 87(86) x 10-10 J    
 
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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