The London, Edinburgh and Dublin philosophical magazine and journal of science . 69 11-20) read after14-56 1 the higher 1791 182-7 15-76 [ tempera- \30-57 J tures. 215-7 2246 35-85 241-35 47-98 250-2 56-2 261-8 67-33 275-85 83-81 Plaitpoint. Table II.—Vapour-pressuresof Mixture 1. Temperature. Pressure. 95-15 1-04 98-0 117 10505 1-52 116-8 2-25 1308 3-54 145-4 5-57 160-2 7-99 1831 13-35 2168 25-12 227-8 30-61 2451 4014 254-6 47-42 264-9 55-94 Plait- point. Table IV. Vapour-pressures ofMixture 3. 1 j Temperature. Pressure. 85-2 0-91 87-6 1-00 92-2 117 9415 1-26 105-1 1-89 116-8 2-81 12365 350 1
The London, Edinburgh and Dublin philosophical magazine and journal of science . 69 11-20) read after14-56 1 the higher 1791 182-7 15-76 [ tempera- \30-57 J tures. 215-7 2246 35-85 241-35 47-98 250-2 56-2 261-8 67-33 275-85 83-81 Plaitpoint. Table II.—Vapour-pressuresof Mixture 1. Temperature. Pressure. 95-15 1-04 98-0 117 10505 1-52 116-8 2-25 1308 3-54 145-4 5-57 160-2 7-99 1831 13-35 2168 25-12 227-8 30-61 2451 4014 254-6 47-42 264-9 55-94 Plait- point. Table IV. Vapour-pressures ofMixture 3. 1 j Temperature. Pressure. 85-2 0-91 87-6 1-00 92-2 117 9415 1-26 105-1 1-89 116-8 2-81 12365 350 1311 4-37 145-3 674 160-15 9-88 170-9 12-43 183-4 16-34 24515 5016 260-1 64-42 275-1 82-04 277-5 846 Plait- point. Table V.—Critical Constants. Temperature. Pressure. Propyl alcohol 26402649275-85277-5 51-555-9 83-884-6 1 Mixture 1 Mixture 2 Mixture ,. Maximum or Minimum Vapour-Pressure. 119 262°-7, but our pressures are all a little higher than their*,the difference increasing with the temperature up to thecritical point, where we find 51*51, their value beino- This difference is probably due to a trace of water in ouralcohol (see below). It will be seen (1) that the maximumvapour-pressure remains up to the critical point, and (2) thatthe critical temperatures have no minimum. The very small difference in the critical temperatures ofpure propyl alcohol and of the first mixture leaves somedoubt as to whether there might not actually be a smallminimum close to propyl alcohol (especially since readingswere taken with different thermometers, one having beenbroken). But even if it did exist, which is very unlikely,the minimum would be very little pronounced, and wouldnot belong to the mixture of maximum vapour-pressure atlow temperatures. The fact that Ramsay and Young founda lower critical temperature for water-free propyl alcoholsupports the conclusion that there is no minimum. This deviation from the normal case, as deduced from thetheory and as realized by mixtur
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
