SPECIFIC HEATS OF SOME COMPOUND GASES. 573 
Table IV. gives the final results calculated from three determinations of the 
velocity of sound in the vapour. 
The letters at the heads of the columns have the following meanings :— 
p. The pressure of the vapour in the Kunpr apparatus when the dust figures 
were made. 
t. The temperature of the vapour. 
i. The length of the dust figures in methylene chloride. 
fe be De . 3 alr. 
p. The specific gravity of the vapour at the pressure at which the experiment 
was made. ‘This specific gravity was taken from the curve in fig 1. 
il @/ == : Ons , 
1+ Aen The correction for deviation from Boyur’s Law, calculated as des- 
ceribed in my former paper. 
y. The ratio of the specific heats, calculated by means of the formula on p. 567. 
8. The ratio of the rates of increase of internal and translational energy of 
the molecule with rise of temperature,'calculated by formula (5) on p. 571. 








TABLE LV. 
: a 
p | t l L Pp sp p IpP”- 7 B 
| s 
152 | 16:7 557 48°66 3:085 1011 |) 1-213 2:263 
160 19-2 25°76 48-90 3086 1-011 1-219 2174 
174 | 19:3 25°81 48°90 3:089 1-011 1225 2:089 
Mean 1:219 2175 




§3. Chloroform, CHCl, 
The tables and figures have in this and most of the succeeding cases the same 
meaning as in the case of methylene chloride. 


TABLE V. 
| | 
| Pp: | t P 
| | 
| 97 | 19:4. 4-112 
| 106 21-2 4114 
| 121 | 20:6 4118 
138 | 20:3 4128 


