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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Mo x unit
 ${\rm xu}({\rm MoK}\alpha_{\rm 1})$
 Value  1.002 099 52 x 10-13 m
 Standard uncertainty  0.000 000 53 x 10-13 m
  Relative standard uncertainty   5.3 x 10-7
 Concise form  1.002 099 52(53) x 10-13 m    
 
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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