GRAVITY OF VAPOUR. 165 
the weight of 100 cubic inches of aqueous 
vapour, temperature 60° and pressure 30 inches 
will be 19.43 grains, and its specific gravity, air 
being 1 will be .626. 
Vapour OF ALCOHOL. 
The 40 inch tube was used in these experi- 
ments, the capacity of the tube 6.08 cubic in- 
ches, and the capacity of the ball 4.3 cubic 
inches, making together 10.38 cubic inches, 
specific gravity of the alcohol .816. Two grains 
in measure equal 1.632 grains in weight, were 
sent up the tube. 
Nine Experiments. 
Wt. of 100 cub. 
inches temper. 
60% and pres. 
30 in. mean. 
Specific gra, 
of vapour. 
vx 
se g 
= 3 EI 
fae Ea B=) 
® 3 s 
ro a o 
— zn 
Se 5) a 
a2 a 5 
oe Bs o 
4s a 
inches 
16.55 
16.51 
16.55 
16.76 
25.50 16.76 220 46.78 1.51 
25.60 16.85 223 46.93 1.51 
25.60 16.85 224 46.90 1.51 
25.30 16.12 200 47.55 1.53 
25.70 16.17 210 46.63 1.50 
25.47 16.57 212 46.86 1.51 
Mean from mean temperature and pressure, weight of 100 cubic 
inches ene f mean 46,865, mean specific gravity 1.51. 
