From: r_delaney2001@yahoo.com   
      
   On December 20, 2020, Martin Brown wrote:   
   > > Ever so slightly different values are quoted in various references.    
   > > The value I use is one seen frequently, 6.02214076 E23 . Other    
   > > perceptions ?   
   >   
   > Unless you are doing something very unusual it makes little difference    
   > beyond 4 sig fig.    
   > Physicists care about it when ... ion counting in mass spectrometry   
      
   What exactly is ion counting, and how?   
      
   —   
   Rich   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)