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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Loschmidt constant (273.15 K, 100 kPa)
 $n_0$
 Numerical value  2.651 645 804...  x 1025 m-3
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  2.651 645 804... x 1025 m-3    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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