LIQUIDS AND AL,UED EXPERIMENTS. 



29 



after (curve, c to d) the steady efflux begins, the behavior being at first very- 

 irregular, as usual for oxygen. The rate here, so far as observed, is 



— »? = 32 X io~^ g/day or 3.7 X lo"^" g/sec. 



The constants of flotation, etc., are 



/t"=i4.5 cm. 



Hence 



dp 



2//" =13.6 cm. 



/ = 28.i cm.. 



= 7.05 cm. 



— = 505 dynes/cm. 



k= 1. 04X10 



-13 



K = 0. 78X10 



-10 



which is somewhat less than the rate found above for air into air with the 

 same apparatus. What is diffusing, however, must be a mixture of oxygen 



Table 6. — Diffusion of oxygen through water into hydrogen and vice versa. M= 12.01 

 grams; i?o = 2.6oXio«; p,„= 13.6; /I=o.o6i7; h'=\.\ cm.; h"= 14.5cm.; ;i"' = 6.8cm.; 

 I /pj = 0.3486;*/ = 28. 1 cm.; areas 14.5 cm. 2; = 7.05 cm.^, a' = 7.45 cm.-; correction = 

 0.08 cm. Hg. 



*Cf. §24. 



and hydrogen with a preponderance of the latter, since the inward diJBfusion 

 of hydrogen ceases when (subscripts indicating the gases) 



p^ = B-Tr and pQ = h"p^ g 



Thereafter, since p^ must decrease indefinitely, pf^ becomes greater than 

 B — r. Thus h"p^g becomes an index for tlie composition of the diffusing 



