io6 



CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. 



The attempt to find the subsidence constant 5 fails; as, for instance, 



*=4-7 3-3 2.0 i.o 

 5= 12.2 7.9 3.4 



4-4 3-o 1.8 

 11.5 6.6 



showing a well-marked progression of data. Similarly, the attempt to 

 find n in the table fails, as the progression is here equally manifest. In 

 other words, with the evaporation of the first fog (on ions) more than half 

 the nuclei are lost, whereas in subsequent evaporations the behavior of 

 the remaining nuclei is more like phosphorus nuclei. 



TABLE 45. Coronas standardized. Ions from gamma rays (radium). Bar. 75.2 cm.; 

 temp. 25 C. ; 90 seconds between observations. Cock open 5 seconds. For ions 

 dp' = 23. 6 cm.; <5/> 3 =22.ocm.; ^' = 0.71; 8p 3 /p = o. 293 (factor, o. 268s 3 ); for water 

 nuclei, dp = 1 8 . i ; ^3=17.1; [<?/> 2 ] = 1 6 . 5 ; dp 3 /p = o. 227; ^ = 0.774. AssumeS = 6.5. 



n'= o.268s 3 . 



These data are shown in fig. 33, where io~ 3 n' = o. 21 $s 3 indicates the 

 number of nuclei actually present in the exhausted fog chamber and n 

 the number which presumably ought to be present. The discrepancy is 

 obvious and in large measure due to the losses in the first evaporation. 

 Thus, taking the second residue (nX io~ 3 = 5o.6) as the initial number 

 the results, in thousands per cubic centimeter, show that over one-half 

 are lost on first exhaustion. 



The same result may be inferred by laying off the nucleation in terms 

 of the number of the exhaustion as in fig. 33. In fact, the phosphorus 

 nucleation, as taken from table 20 for corresponding initial nucleations, 

 vanishes per exhaustion more slowly throughout. 



66. Further data. Thus it appears that the water nuclei obtained 

 by evaporating fog particles precipitated on ions vanish more rapidly, 

 at least in the beginning, than may be accounted for as the combined 

 result of the exhaustion applied and the subsidence. New results were 



