The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron charge to mass quotient
 $-e/m_{\rm e}$
 Value  -1.758 820 088 x 1011 C kg-1
 Standard uncertainty   0.000 000 039 x 1011 C kg-1
  Relative standard uncertainty   2.2 x 10-8
 Concise form  -1.758 820 088(39) x 1011 C kg-1    
 
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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