ON THE THERMAL PROPERTIES OF ALCOHOL. 
137 
In calculating the weight of 1 cub. centira. of saturated vapour, it has been pointed 
out, in § 5, that this constant depends on the specific gravity of the liquid. Now the 
specific gravity of the liquid may be taken, (1) as directly read, or (2) from the 
smoothed orthobaric curve. Both of these have been made use of, and the results 
are compared in the following table :— 
T. 
Weight of 1 cub. centim. vapour. 
Weight of 1 cub. centim. 
of vapour smoothed 
by curve. 
Vol. of 1 gram. 
(1.) 
(2.) 
(3.) 
O 
llO'O 
grms. 
0*00713 
grms. 
0*00728 
\ 
r 0-00577 
0-00650 
c 
iib. centims. 
r 173 
[ 154 
130-05 
0-01025 
0-01041 
\ 
r 0-01055 
[_ 0-01090 
r 94-8 
L 91-7 
140-25 
0-01403 
0-01370 
\ 
0-01365 
0-01370 
r 73-3 
73-0 
150-65 
0-01743 
0-01743 
0-01705 
58"6 
160-25 
0-02278 
0-02255 
0-02090 
47-8 
161-6 
0-01969 
0-02044 
0-02140 
46-7 
171-75 
0-02608 
0-02608 
0-02615 
38-2 
181-4 
0-03233 
0-03135 
0-03200 
31-2 
189-8 
0-03882 
0-03882 
0-03860 
25-9 
200-0 
0-04907 
0-04916 
0-04955 
20-2 
210-05 
0-06578 
0-06620 
0-0655 
15-3 
220-45 
0-08606 
0-08676 
0-0862 
11-6 
225-05 
0-09711 
0-09738 
0-0977 
10-2 
230-35 
0-11446 
0-11431 
0-1145 
8-73 
232-6 
0-12324 
0-12331 
0-1235 
8-10 
234-7 
0-13426 
0-13434 
0-13325 
7-50 
235-85 
0-13870 
0-13909 
0-1394 
7-17 
236-8 
0-14569 
0-14554 
0-1450 
6-90 
237-95 
0-15184 
0-15225 
0-1529 
6-54 
239-0 
/ 0-16209 
\ 0-16092 
/ 0-16119 
1 0-16080 
0-1615 
6-19 
240-1 
0-17271 
0-17277 
0-1727 
5-79 
241-25 
0-18643 
0-18719 
0-1870 
5-35 
242-25 
0-20294 
0-20294 
0-2050 
4-88 
242-6 
0-22431 
0-22522 
0-2250 
4-44 
The chief differences in the numbers in these columns are at low temperatures, 
where a small alteration in the specific gravity of the liquid causes a large change in 
the weight of 1 cc. of saturated vapour. 
22. From the data already given, the densities compared with hydrogen under 
similar conditions of temperature and pressure were calculated. In these calculations 
the data given in columns 1, 2, and 3 of the preceding table have been employed, and 
the corresponding vapour-densities are similarly numbered. The vapour-densities 
found were then plotted on a curve, and the 4th column shows the smoothed results. 
MDCCCLXXXVI. 
T 
