The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Loschmidt constant (273.15 K, 100 kPa)
 $n_0$
 Value  2.651 6462 x 1025 m-3
 Standard uncertainty  0.000 0024 x 1025 m-3
  Relative standard uncertainty   9.1 x 10-7
 Concise form  2.651 6462(24) x 1025 m-3    
 
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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