CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. 



which can therefore only be obtained approximately. If the vapor 

 pressures T: I and n\ correspond to p t and p\, the results would be 



_ = 



,, 



_ - \C/K-_ 



7- \ 



where approximate values must be entered for 

 inator on the right side of the equation. 

 Similarly 



TT^, /> t , in the denom- 



Making use of the values found incidentally elsewhere, the data of 

 table 2 were computed on a single approximation. They are repro- 

 duced in the graph (fig. i). 



TABLE 2. Successive values of pressure and temperature in the plug-cock fog cham- 

 ber. Volume ratio of fog and vacuum chambers, v/V = 0.064; p = j6; t=2OC.\ 

 11=1.7 cm.; / refers to degrees C., r to absolute temperature, dp denotes the 

 drop in pressure. r/r l =(p/p l Y~ e/k and T/T / I )=(// / I ) I - / * assumed. 



1 These observations merely illustrate the equations. No attempt made at accuracy. See chart. 

 2 The values of P)/Pi = o.gi, 0.93, 0.95, respectively. 



The corrections, (p 2 p 3 ) varying with (p p 3 ), lie on a curve which 

 passes through zero, but with a larger slope than for dry air. In fact, 

 they are much in excess of these cases* and throw the whole phenom- 

 enon into a lower region of pressures. 



*Am. Journ. Science, xxu, p. 342, 1906. 



