Ki':nni;dv — Large Ions and Condensation- Nuclei from FlanieK. 61 



disappearance is very much slower than in the case of small ions ; at the end 



of three hours, there still remains a considerable quantity of ionization. 



Fig. 4 shows the graph of N'^ and the time. The graph is a straight line, 



showing that 



1 1 



1 _-!_ 



iV(, being the value of N at the beginning, and /3 a constant. The large ions, 

 therefore, recombine according to the law 



1100 



IDQO 



90C 



800 



7cn 



bCO 



X 500 



400 



300 



200 



100 



clN 

 'di 



= - ^N\ 



20 40 60 80 100 (ZO l4-0 160 180 



M i n u tes 



Fig. 4. 



It will be seen, however, that towards the end the rate of disappearance is 

 more rapid than the law indicates. 



The value of /3, the constant of recombination, is 6-3 x lO"'", taking the 

 second as the unit of time. 



