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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Boltzmann constant
 $k$
 Value  1.380 6488 x 10-23 J K-1
 Standard uncertainty  0.000 0013 x 10-23 J K-1
  Relative standard uncertainty   9.1 x 10-7
 Concise form  1.380 6488(13) x 10-23 J K-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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