The nucleation of the uncontaminated atmosphere . es, because ofthe accentuated rapidity of thermal radiation. The adiabatic method 26 NTJCLEATION OF THE UNCONTAMINATED ATMOSPHERE. ceases to be effective. Finally the necessity of producing suddencooling simultaneously with extreme dilatation is a complication; forin view of the relative slowness of diffusion, it will eventually be im-possible to keep the instantaneously dilated water vapor saturatedwithout arresting the growth of the fog particles. Above Bp = 40 effect of sudden exhaustion might actually dry the air, seeing thatthe dens
The nucleation of the uncontaminated atmosphere . es, because ofthe accentuated rapidity of thermal radiation. The adiabatic method 26 NTJCLEATION OF THE UNCONTAMINATED ATMOSPHERE. ceases to be effective. Finally the necessity of producing suddencooling simultaneously with extreme dilatation is a complication; forin view of the relative slowness of diffusion, it will eventually be im-possible to keep the instantaneously dilated water vapor saturatedwithout arresting the growth of the fog particles. Above Bp = 40 effect of sudden exhaustion might actually dry the air, seeing thatthe density of vapor is instantly reduced more than one-half. It isthus conceivable that even slight differences of supersaturation at theoutset may show themselves effectively at these high exhaustions. Intable 16, however, the nucleation N (reduced to normal pressure)increases almost linearly with the pressure difference even at the high-est exhaustions. The evaporation of the smaller fog particles isprobably an essential part of the whole Figs. 20-25.—Change of apertures (s) of coronas and number of efficient nuclei (n)varying with different pressure differences ($£) for the cases of superiorand inferior coronas. Dust-free air. Table 6, referred to in fig. 20, will be found as table 15, p. 24. Table 7, referred to in fig. 22, will be found as table 16, p. 24. Table 8, referred to in fig. 24, will be found as table 17, p. 25. NUCLEATION UNDER VARYING CONDITIONS. 27 22. Blurred coronas.—The occurrence of an abundance of rain withall the coronas, as well as the blurred appearance of the coronas them-selves, shows that gradation of particles is a characteristic feature withall these condensations. The following results for periodicity appar-ently indicate the presence of a group of markedly large particles inthe amount of about one-eighth or more of the total number of nuclei. 23. Time effect.—In the lapse of time exceeding even half an hourthe aperture of all corona
Size: 1675px × 1492px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherwashi, bookyear1906
