no 



VAPOR NUCLEI AND IONS. 



One might perhaps suppose that cohesion of molecules is more frequent 

 when collisions are less frequent or that effectively more large particles 

 reside in the exhausted gas. There are other cases given below which 

 seem to suggest this peculiar inference. 



72. Data for coal gas. These are given in table 43 in the same way as 

 in table 42, both for the non-energized and for the energized gas when 

 the X-ray bulb is at a distance of 200 cm. from the fog chamber. The 

 measurements were much less satisfactory than the above, the corona 

 being thin and blurred. This may perhaps be due to the fact that mixed 

 gases are under examination. 



Table 43. Distributions of nuclei in coal gas, washed in water and AgN0 3 . 



1 Fluctuation of s not infrequent. 



73. Character of the early results for coal gas. As in case of C0 2 , the 

 data for coal gas throughout lie in a region of relatively low pressure; 

 *. e., large drops in pressure are needed to produce the coronas. Fog 

 limits are correspondingly high. This will again be qualitatively in keep- 

 ing With the low heat ratio y. 



Apart from this, these first results with the hydrocarbon gas differ 

 thoroughly from the character of the results for air and C0 2 . In the non- 

 energized gas the nucleations rise to the pressure difference at a rapidly 

 accelerated rate, and this continues to the highest value which dp applied 



