n8 



VAPOR NUCLEI AND IONS. 



10 iz 14 is ib ao ^^ ^4 ^6 aa 30 



Fig. 55. Aperture of coronas (s), observed at different exhaustions (dp), in media of 

 alcohol-air, water-air, energized or non-energized. Table 46. 



I4C0 



1200 



ICOO 



BOO 



600 



400 



ZOO 



10 IZ 14 16 18 ZO ZZ Z4 Z6 Z8 30 32 34 36 38 



Fig. 56. Efficient nucleation n in energized or non -energized media of alcohol-air and 

 water-air, at different exhaustions {dp). Table 46. 



the saturated vapor which furnishes the colloidal nuclei and that the 

 gas is only secondarily involved. 



81. Data for alcohol vapor. The behavior of alcohol vapor is shown 

 in the usual way in table 46, where dp is the sudden fall in pressure from 

 atmospheric pressure producing the corona of the angular diameter 

 5/30, when the eye and the source of light are at distances 40 and 250 

 cm. on the opposed sides of the fog chamber. The nucleation n is com- 

 puted in the way given above, section 79, and indicates the number of 



