26 



THB DIFFUSION OF GASES THROUGH 



The experiment of this section is the converse of those briefly detailed in 

 table 2 and repeated at greater length in a following paragraph (23). The 

 data are given in table 5 and are shown graphically in fig. 8. During the 



Table 5. — Diffusion of air through water into hydrogen. M= 14.45; i: = 98i ; Pm= 13-6; 

 i?a = 2. 87X10^; = 6.4 cm.-; A = AIgpm/Ra = o.o6'ji-j; /j'=i.5cm.; /j"=iocm.; /j"'=5 

 cm.; I /pj = 0.3486.* 



*Cf. §24. 



first days and later the swimmer rapidly increases in weight, at least at first; 

 the influx of hydrogen or the initial apparent rate is about 



m = 0.000550 g/day = 64 X io~'''g/sec. 



and it thus much exceeds the converse case of table 2 ; but this rapid influx 

 is soon reduced in the lapse of time. 



The bubble phenomenon, due to the diffusion of hydrogen into micro- 

 scopic air-bubbles adhering to solid parts, under water, was equally promi- 

 nent. During the early days these gathered in great quantity and had to 

 be shaken off. It would be interesting to estimate the virtual pressure at 



