8o 



THE DIFFUSION OF GASES THROUGH 



The record of diffusion is given in table 39 and fig. 

 nearly regular and corresponds to the rates 





It is throughout 



^^'0^ 



o.oioo c.c./'day or 10 \ = 0.302 



which is less than the preceding case and still far distant from the value for 

 pure water. The advantage of the weekly period of observations is obvious. 



Table 39. — Air into air through K3SO4 solution ( t .7 grams in 100 grams water). Single- 

 tube vessel. Constants as in table 37. Pu = 1.0136 at 20°. 



S5«e26' 3/Ja7i5 10 15 -^0 ?5 30 



Fig. 33. — Chart showing loss of standard volumes 

 of gas in diver in lapse of days. Diffusion 

 of air through K2SO4 solution. 



59. Diffusion of Air into Air Through NaoS04 Solution. — This solution 

 was prepared for comparison with K2SO4, though unfortunately neither 

 is very soluble. The density of the Na2S04 was found to be p,^ =1.1 160 

 at 20°, implying 13.7 grams in 100 grams of solution or 15.9 grams in 

 100 grams of water. The vapor pressures were taken as tt' = 7r(i —0.035). 



Table 40. — Air-air through Na^SOi solution (15.9 grams in 100 grams water). Vessel 

 E (single tube). Constants as in table 20. p,t= i.i 160 at 20°. 



