3L6 
PROFESSOR W. RAMSAY AND DR. S. YOUNG 
Temperature. 
Pressure. 
V olume. 
P. V. 
Vapour-densitv. ; 
(H=l.) 
O 
60 
mms. 
264*5 
c.cs. 
173*7 
45,944 
1613 
(Alcohol vapour, P = 350'3 mms.) 
2657 
172-4 
45,807 
16-17 
292-0 
1570 
45,844 
1616 
317-5 
144-25 
45,800 
16-18 
360-6 
126-6 
45,652 
16-23 
408-0 
111-05 
45,309 
16-35 
474-3 
95-0 
45,058 
16-44 
557-8 
80-1 
44,680 
16-58 
624-4 
70-0 
43,708 
16-95 
40 
243-8 
174-0 
42,421 
(condensed ?) 
16-42 
(Alcohol vapour, P = 133 7 mms.) 
260-1 
160-0 
41,616 
1673 
Condensed at smaller volumes. 
The vapour-pressure at 60° is 625T millims. ; and at 40°, 260‘47 millims. The 
vapour-densities at 40° appear to be too high ; this would be caused by the presence 
of dust particles, which may cause condensation at low temperatures and at pressures 
considerably below the vapour-pressure. 
Constants at high temperatures. —Three different amounts of methyl-alcohol were 
employed for these experiments. The first quantity, which we shall call A, was com¬ 
paratively large, and was employed for the determination of the orthobaric volumes # 
and of the vapour-pressures. Its volume was ascertained by direct measurement, and 
its weight from determinations of the specific gravity of methyl-alcohol at low 
temperatures. The weight of the second quantity, B, was calculated from a comparison 
of its volumes when gasified with those of the third quantity, under similar conditions 
of temperature and pressure. That of the third quantity, C, was ascertained from its 
density at 240°, at large volumes, when p.v. remained constant during considerable 
change of volume. In the course of the experiments the quantity C was slightly 
increased by rise of liquid from the lower portion of the tube. The increased weight, 
which we shall term C', was ascertained by a comparison between the volumes of this 
portion and those given by the former. 
A. Results of experiments with large quantity. Sy>ecific gravity of methyl- 
alcohol. —The specific gravity was determined by a Sprengel's tube of the form 
recommended by Perkin (‘ Chem. Soc. Trans.,’ 1884, p. 443). 
Weight of methyl-alcohol at 22‘94° . . . 16‘59625 grammes. 
Weight of water ,. ... 20‘9595 ,, 
Specific gravity at 22‘94° (water at 4 U =1) . 0‘78909 ,, 
Volume of 1 gramme. 1‘26729 cub. centim, 
(These weighings were reduced to a vacuum.) 
* We term “ ortliobaric volumes” the volumes occupied by 1 gramme of the liquid under the vapour- 
pressures corresponding to the temperatures of measurement. 
