72 THE DIFFUSION OF GASES THROUGH 



The rates of diffusion are 



? = o.oi45 c.c./day or io w k = o.2$6 



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 

 were made in vessel F, the original solution being nearly concentrated. 

 The density was p w = 1.1450 at 2 2°, 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 t' = -k (1— 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 



£ = 0.0035 c.c./day or io 10 k = 0.088 



showing very slow diffusion. 



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

 M= 10.9387 grams; £=39.294; p ? = 2.4b6; float, 2^ = 3.00 em.; vessel, 2r = 4.7cm.; 

 p w = 1 . 1 4 5 at 22 . 



Date. 



Barom- 

 eter. 



t 



H 



Wo 



Date. 



Barom- 

 eter. 



t 



7/ 



Wo 



Nov. 12 



• 75-85 





 19.0 



7295 



4.587 



Dee. 3 



•1 76.45 



16.5 



71.48 



4.530 



13 



• 76-17 



18.8 



73.09 



4 



599 



4 



• 76.30 



16 



b 



7' 



51 



4 



530 



14 



• 75 69 



18.8 



73.20 



4 



606 



5 



• 77-o6 



'7 







7i 



51 



4 



525 



'5 



• 75-72 



18.8 



73.21 



4 



607 



6 



• ! 75.75 



'7 



3 



7i 



64 



4 



529 



16 



• 76- 52 



.8.5 



73.12 



4 



606 



7 



• 76.14 



17 



7 



7i 



63 



4 



522 



18 



76.26 



18.0 



72.88 



4 



598 



9 



. 76.28 



'7 



7 



7' 



63 



4 



522 



'9 



. 76.29 



17.7 



72.79 



4 



59b 



10 



• 7633 



"7 



7 



7i 



53 



4 



5 .b 



20 



• 75-97 



17.7 



72.61 



4 



584 



1 1 



■ 75-92 



•7 



3 



7i 



54 



4 



523 



21 



• 7631 



'7-3 



72.48 



4 



582 



12 



76 . 1 6 



'7 



4 



7' 



33 



4 



508 



22 



• 75-94 



17 3 



72-43 



4 



579 



"3 



• 77- 'o 



'7 



2 



7i 



27 



4 



507 



23 



. 76.08 



'7-5 



7253 



4 



582 



14 



• 76.74 



'7 



O 



7' 



2b 



4 



509 



25 



• 74-9' 



17-3 



72-47 



4 



582 



16 



• 75-40 



lb 



9 



7i 



1 1 



4 



501 



26 



76.20 



'7-3 



72.40 



4 



577 



•7 



• 76.45 



'7 



1 



70 



94 



4 



487 



27 



. 76.38 



17. 1 



72-19 



4 



566 



18 



. 76.40 



'7 



2 



70 



65 



4 



467 



29 



• 76-95 



16.6 



71 .96 



4 



559 



19 



•; 74-34 



'7 



3 



70 



67 



4 



468 



30 



• 76.79 



16.6 



71.64 



4 



538 



20 



• 75-88 



17 



3 



70 



65 



4 



467 



Dec. 2 



76 . 60 



16.4 



71-44 



4 



529 













46 



















44 



t. 









° ■"' "- 1 



—»••*. 





ofozft 



27Skr.£ 



./ 



45 



x 







~~~i~^ 











4" 



c 







\ 











fe.H 



J 



" 



6 







t Jan.l 



\ 10 



1 



5 K 



I) X 



» 3 



J 



B 



Fig. 26 a, b. — Chart showing loss of standard volumes 

 of gas in diver in lapse of days. Diffusion of air 

 through NaCl solution. 



