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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deuteron mass in u
 $m_{\rm d}$
 Value  2.013 553 212 712 u
 Standard uncertainty  0.000 000 000 077 u
  Relative standard uncertainty   3.8 x 10-11
 Concise form  2.013 553 212 712(77) u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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