The London, Edinburgh and Dublin philosophical magazine and journal of science . ion ofbisulphide of carbon at 16°*0 is 264 8 millim., at 13°*8 it is251*6 millim., both referred to mercury at those chloroform the vapour-tensions at these two temperatures,also referred to mercury at the same temperature, are 169*2and 158*4. A very great increase of the vapour-tension isbrought about by mixing a very little bisulphide with thechloroform ; a little rise is brought about by mixing a littlechloroform with the bisulphide. The graphic interpretationsof the two Tables LXVI. a and LXVI.
The London, Edinburgh and Dublin philosophical magazine and journal of science . ion ofbisulphide of carbon at 16°*0 is 264 8 millim., at 13°*8 it is251*6 millim., both referred to mercury at those chloroform the vapour-tensions at these two temperatures,also referred to mercury at the same temperature, are 169*2and 158*4. A very great increase of the vapour-tension isbrought about by mixing a very little bisulphide with thechloroform ; a little rise is brought about by mixing a littlechloroform with the bisulphide. The graphic interpretationsof the two Tables LXVI. a and LXVI. b are shown in curvesC and D, fig. 6. § 279. If we could find two liquids showing neither con-traction nor expansion when mixed, and neither liberatingnor absorbing heat, the vapour-tension of a mixture of suchliquids should be expressed by the equation Vt(ma+nb) = Vta + mafytb — vtg)ma 4- ?ib * where generally vts means the vapour-tension of the liquid s,and where a and b are the liquids and m and n their respective Volume Changes attending Mixture. 515 Fig. 6. Fir. 430 WB 420 2!! 410 ?B£J in 400 ?sasi 390 ©i I! 38037036u ri[ ??? 350 340 Eb_| 330320 IB 310 300 m fill 290 m 280 1 270 26( mm 250240230 mm ? m i/£ sal 220 ? F>»!9 ? VBH 210 ? H 200 ? n 190 ?? 180 170160150 IMS E 1301-20 I H Hi ? ? a 100 m 90 80 £3 i II 7060 ? ri 1 ? 50 I m 30 20 1 10 0 ? Per cent. 0 10 20 30 40 50 60 70 80 90 100 llO 516 Frederick Guthrie on some Thermal and masses. The vapour-tension curve would be a straight linejoining the vapour-tensions of the constituents. The maximumdeparture from this straight line on the curves in fig. 6 givesus the maximum interference. This, in the case of chloroformand ether, is at the monoinolecular ratio. Now, if we searchthe curve of mixtures containing bisulphide of carbon, we findthere also a maximum departure from the mean at a certainratio. In the case of bisulphide of carbon and ether this is at30 or 35 per cent, of the ether (say 32*5). This i
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