8o 



THE DIFFUSION OF GASES THROUGH 



The record of diffusion is given in table 39 and fig. 33. 

 nearly regular and corresponds to the rates 



i'o = 0.0100 c.c./day or io 10 k = 0.302 



It is throughout 



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 K 5 S0 4 solution ( 1 .7 grams in 100 grams water). Single- 

 tube vessel. Constants as in table 37. p w = 1.0136 at 20 . 



Date. 



Barom- 

 eter. 



t 



H 



J'o 



Date. 



Barom- 

 eter. 



t 



H 



t'o 



Dec. 26. . 



77.10 





 17. 1 



69. 05 



4.294 



Jan. 3 . . 



73.98 





 18.0 



67.36 



4.178 



28.. 



75-50 



17. 1 



68.35 



4.251 



!0. . 



77-35 



'7-5 



66.01 



4. 100 



30.. 



75-74 



•7-3 



67.71 



4.209 



17. . 



76.54 



17-3 



64.78 



4.027 



31. . 



76.34 



17.6 



67.60 



4. 198 



24. . 



76.10 



17.6 



63.86 



3-965 



Jan. 1 . . 



76.01 



17.8 



67.49 



4. 189 



31. . 



76.17 



17.6 



62.73 



3.895 



2. . 



76.87 



17.9 



67.25 



4.172 













41 



















&9 



\ 

















31 



















6 3 



1 Jan 



'-> 1 



9 1 



5 2 



Z 



5 3 







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 Na 2 SO, Solution. — This solution 

 was prepared for comparison with K 2 S0 4 , though unfortunately neither 

 is very soluble. The density of the Na 2 S0 4 was found to be p w =i.n6o 

 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 ic' = tt(i —0.035). 



Table 40. — Air-air through Na 2 S0 4 solution (15.9 grams in 100 grams water). 

 £ (single tube). Constants as in table 20. p u = i.i 160 at 20 . 



Vessel 



Date. 



Barom- 

 eter. 



t 



II 



•>o 



Date. 



Barom- 

 eter. 



t 



II 



i'o 



Nov. 25 



• 74-9« 







'7-3 



68.53 



5.182 



Dec. 10 



• 76.33 





 .7.6 



67.65 



5. m 



26 



76.20 



'7-3 



68.52 



5. 181 



1 1 



• 75-92 



'7 



3 



67.51 



5.105 



27 



- 76.38 



17. 1 



68.44 



5-179 



12 



. 76.16 



'7 



4 



67.42 



5.096 



29 



• 76.95 



16.6 



68.18 



5.167 



'3 



• 77-10 



'7 



2 



67.23 



5.085 



30 



• 76.79 



16.6 



67.81 



5-139 



14 



- 76.74 



17 







67. 12 



5.081 



Dec. 2 



76.60 



16.4 



67-53 



5. 121 



16 



• 75 40 



'7 







66.99 



5.071 



3 



• 76.45 



16.3 



67.58 



5.127 



17 



• 76-45 



'7 



2 



66.83 



5-055 



4 



• 76.30 



16.6 



67.63 



5.125 



iS 



. 76.40 



'7 



3 



66.67 



5.041 



5 



77.06 



16.9 



67.56 



5. 1 16 



19 



• 74-34 



17 



5 



66.64 



5 037 



6 



• 75-75 



'7 3 



67.73 



5. 122 



20 



. 75-88 



17 



5 



66.39 



5.018 



7 



• 76.14 



17.7 



67.73 



5. 115 



21 



• 76.57 



>7 



5 



66.24 



5.006 



9 



. 76. 28 



17.7 



67.70 



5.113 



23 



• 76.75 



17.2 



65.99 



4.992 



