A text-book on chemistryFor the use of schools and colleges . Describe Fig. shown ? How may diffusion through poreless media MARRIOTTE S LAW. 257. M Fig. 239, that sulphureted hydrogen will dif-fuse into atmospheric air, though resisted bya pressure of 750 pounds on the square consists of a strong tube hermeticallysealed at one end, through which a pair ofplatinum wires, b c, pass. The other end,a a, is closed by a sheet of India-rubber. Thegauge-tube, c?, which indicates the pressure,carries at its top a little cup to contain ace-tate of lead, or any other reagent. On con-necti
A text-book on chemistryFor the use of schools and colleges . Describe Fig. shown ? How may diffusion through poreless media MARRIOTTE S LAW. 257. M Fig. 239, that sulphureted hydrogen will dif-fuse into atmospheric air, though resisted bya pressure of 750 pounds on the square consists of a strong tube hermeticallysealed at one end, through which a pair ofplatinum wires, b c, pass. The other end,a a, is closed by a sheet of India-rubber. Thegauge-tube, c?, which indicates the pressure,carries at its top a little cup to contain ace-tate of lead, or any other reagent. On con-necting b and c with a Voltaic pile, the wa-ter which fills the tube to e e is decomposed,and oxygen and hydrogen accumulate in thetube, exerting a pressure greater and great-er as the decomposition is prolonged. Thewhole apparatus may then be subjected toa jar of sulphureted hydrogen. It will befound to pass through with facility, coloringthe acetate of lead solution black or deepbrown. That the atmosphere is a mixture, and nota compound, is proved by its easy decomposibility, itsrefractive- power, and by the fact that its constituentsretain their pro
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