Carnegie Institution of Washington publication . wimmer, which is not the case in fig. 3;the level / may be sharply determined, since there is no danger of the riderparting the water at the surface. Discrepancies due to friction of convec-tion currents are diminished. The heads h, h, and h may be more 7 8 THE DIFFUSION OF GASES THROUGH accurately measured. Finally, the whole arrangement is more conduciveto constancy of temperature in the essential parts of the apparatus than isthe case in fig. 3. T \P,„ P„J (0 11. Imprisoned Hydrogen Diffusing into Free Air. Preliminary Data.— As before the ma
Carnegie Institution of Washington publication . wimmer, which is not the case in fig. 3;the level / may be sharply determined, since there is no danger of the riderparting the water at the surface. Discrepancies due to friction of convec-tion currents are diminished. The heads h, h, and h may be more 7 8 THE DIFFUSION OF GASES THROUGH accurately measured. Finally, the whole arrangement is more conduciveto constancy of temperature in the essential parts of the apparatus than isthe case in fig. 3. T \P,„ P„J (0 11. Imprisoned Hydrogen Diffusing into Free Air. Preliminary Data.— As before the mass m of hydrogen contained at v in the swimmer is given by ,_ MgPv m — R T \PV where Mg is the weight of the glass swimmer, pm the density of mercury ato° C, pw the density of water at t°, and pQ the density of glass. H is thebarometric height diminished by the head equal tothe vapor pressure of water vapor, r the absolutetemperature, and R the gas constant of latter applies at the outset only. Since M= grams5 = 98i. Pm=I3-6i? = the constant A = Mgpm/R = The hydro-gen used was obtained electrolytically from water,enough being introduced into the swimmer to justprevent flotation. In the course of time the gases contained in thediver will change from the influx of diffused air andthe efflux of hydrogen. Hence the gas constant Rof the imprisoned gas is not fixed in value. Sup-posing, however, all observations to be made or alldiffusion to occir at a certain mean pressure B andtemperature t; since for all gases Rp = R0p0, thelatter referring to the initially pure gas at the giventemperature and pressure (supposed, as stated, tobe constant during flotation); and since, finally,tn = vp = vp, during and before flotation, therefore R0P0 T \P» Pa \Pu> Pa o Fig. 5.—Loss of massof gas in diver in lapseof days. Diffusion ofhydrogen into air. 0) so that the variations of volume v are referred to in taking the quantityA = Mgpm/R constant.
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1910, bookyear1913
