72 THE DIFFUSION OF GASES THROUGH 



The rates of diffusion are 



^0 = 0.0145 c.c./day or io^*'/v = 0.256 



There has thus been a retrogression of rates, while the other diffusions in 

 the same region behaved normally. The rate is still far from the large 

 value corresponding to pure water. 



47. Diffusion of Air into Air Through NaCl Solution. — The experiments 

 w'ere made in vessel F, the original solution being nearly concentrated. 

 The density was Pj^= 1.1450 at 22°, equivalent to 19.6 grams in 100 grams of 

 solution or to 24.4 grams in 100 grams of water. The vapor pressures were 

 taken as tt' = TT (i— 0.157). 



The current data are given in table 28 and fig. 26 a. 



Fig. 26 A shows a fairly regular progress of results and the constants are 



z'o = 0.0035 c.c./day or io^''k = 0.088 

 showing very slow diffusion. 



Table 28. — Air-air through brine (24.4 grams in 100 grams water). Single-tube vessel. 

 i¥= 10.9387 grams; C=39.294; pg = 2.^66; float, 2r = 3.oocm.; vessel, 2r = 4.7cm.; 

 Pa,= 1.145 at 22°. 



cfh;.iZ ft ZZ 11 Skvl 



J 



la n 



Fig. 26 A, B. — Chart showing loss of standard volumes 

 of gas in diver in lapse of days. Diffusion of_air 

 through NaCl solution. 



