20 



THE DIFFUSION OF GASES THROUGH 









Table 



3— < 



Continued. 







Date. 



Hour. 



Barometer. 



H. 



t. 



Observed 



mXio 6 . 



Computed 

 )»X 10 6 . 



A mXio 6 . 





A. m. 















Apr. i 



■ 3 30 



75-37 



51.40 



17.6 



6455 



6402 



+ 53 



2 



5 oo 



75 



97 



49 



92 



15.9 



6304 



6367 



- 63 



3 



• 3 30 



76 



71 



49 



18 



.6.3 



6202 



6332 



-130 



4 



4 oo 



77 



07 



48 



68 



16.3 



6139 



6297 



-158 



5 



4 oo 



75 



27 



48 



80 



17.2 



6137 



6262 



-125 



6 



• 3 45 



75 



3i 



49 



64 



19.5 



6197 



6227 



- 30 



7 



3 oo 



75 



47 



50 



08 



20.2 



6238 



6192 



+ 46 



8 



• 4 30 



76 



43 



49 



39 



18.0 



6195 



6157 



+ 38 



9 



• 4 30 



76 



28 



48 



49 



17.0 



6101 



6122 



- 21 



IO 



. 4 00 



76 



86 



48 



34 



19.0 



6045 



6087 



— 42 



1 1 



. 3 30 



77 



25 



47 



98 



19.0 



6000 



6053 



- 53 



12 



•' 3 30 



77 



52 



47 



5« 



18.2 



5964 



6018 



- 54 



'3 



.1 4 00 



11 



36 



47 



27 



18.8 



59"4 



5983 



- 69 



14 



• | 3 45 



76.26 



47.07 



'7-5 



59'3 



5948 



- 35 



least squares. The run of the thermometer on the same sheet, fig. 6, bears 

 out this surmise. The barometer, like the vapor pressures, shows no easily 

 discernible relation to the weight curve; but the run of temperature fore- 

 shadows the kinks in the m curve throughout its extent. 



Sek 5 10 15 ZO ZSJkavZ 7 1Z W ZZ Z7 cHjjt.1 6 ft 

 Fig. 6. — Loss of mass of gas in diver in lapse of days. Diffusion of air into air. 

 If we write for the air-water system (time t in days, mass m in grams) 



m = »t — mt 

 and compute the constants m and m by the method of least squares from 

 the 68 observations made between January 31 and April 11, the values 

 obtained are 



w = 0.0085327 gram m = 0.00003493 gram/day 



