Chemical lecture experiments . ugh the walls of a porous cell may be shown by anumber of striking experiments in which the variations inpressure caused by the hydrogen enter-ing or leaving the cell are utilized. A porous cell, approximately 12 and 5 cm. in diameter, is providedwith a two-holed rubber stopper tightlyfitted into its mouth. Through one holea 5 cm. length of glass tubing of 6 diameter is thrust, and throughthe other a short piece of small glasstubing about 3 mm. internal smaller glass tube is plugged witha short piece of rubber tubing and a bitof g
Chemical lecture experiments . ugh the walls of a porous cell may be shown by anumber of striking experiments in which the variations inpressure caused by the hydrogen enter-ing or leaving the cell are utilized. A porous cell, approximately 12 and 5 cm. in diameter, is providedwith a two-holed rubber stopper tightlyfitted into its mouth. Through one holea 5 cm. length of glass tubing of 6 diameter is thrust, and throughthe other a short piece of small glasstubing about 3 mm. internal smaller glass tube is plugged witha short piece of rubber tubing and a bitof glass rod. The larger tube is con-nected by means of a rubber tube with along glass U-tube half filled with coloredwater. If a jar of hydrogen is nowbrought down over the porous cell, thepressure inside is increased and the level of the water inthe U-tube will be disturbed, that in the arm connectedwith the porous cell falling, that in the other arm rising anequal distance. Porous cup ; long glass U-tube ; ink water ; jar of Fig. 24 17. Diffusion out of a porous cup.—When the interior ofthe porous cup is filled with hydrogen, the diffusion out-ward is so rapid as to cause an internal diminution ofpressure. The jet tube is removed from the Wolff bottle in Fig. 25and a rapid stream of hydrogen is sent into the porous cupthrough a small glass tube which is provided with a rubberconnector and a pinch-cock. On suddenly stopping the 56 CHEMICAL LECTURE EXPERIMENTS flow of the gas by closing the pinch-cock, the hydrogen willdiffuse out of the porous cup into the air, diminishing theinternal pressure inside the cup. The colored water willrise immediately in the pipette, nearly filling the (Fig. 25) ; II generator (Kipp). 18. Diffusion producing a fountain. — One neck of asmall two-necked Wolff bottle is fitted with a glass tube whose lower end nearly touches the bot-tom of the bottle, the upper end reach-ing a few centimeters through the corkand being drawn down t
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