32 



THB DIFFUSION OF GASES THROUGH 



Table 7. — Diffusion of hydrogen through water into air. Heavy swimmer, il/= 37.42; 

 i?A=4i.45Xio«; pm=i3.6; i/pg = o.3486;* A = Mgpm/Rh = o.o\2oy, h'=\.8 cm.; 

 A"= 1 1.5 cm.; /f"' = 4.5 cm.; / = 20.5 cm. Areas, inside 1 1.5 cm. 2, outside 13.5 cm. 2, 

 ring 24.6—13.5=11.1 cm.^; p;, = 89. 53X10"^. Diameters 3.83, 4.13, 3.6cm.; cor- 

 rection 0.13 cm. Hg. 



*Cf. § 24. 



24. Correction for Density of the Glass. — The provisional value of i/pg ad- 

 mitted in tables 2, 3, 4, 5, 6, and 7 when the divers were engaged, viz, 

 I /P(, = 0.3486, was inadvertently chosen too small; i. e., the density was 

 overestimated. Experiments made by Miss L. C. Brant at the end of the 

 work, when the divers were available, showed the values given in table 

 8, the divers being recognized by the weights m. 



Table 8. 



It suffices for the present purposes of correction to take the mean value 

 P(, = 2.466, so that the error is 5pg = —0.402. 



