of Ammonia, Sulphur dioxide, and Carbon dioxide. 379 



Carbon dioxide. — The parts A, B, C of the filling apparatus 

 were removed and replaced by a strong bolt-head flask fitted 

 with a rubber stopper and glass tube. The tube had a 

 T-shaped piece, connected with the drying tube D and with 

 a screw-clip and short piece of pressure tubing on the other 

 arm of the T. Solid carbon dioxide, obtained from a cylinder 

 of liquid in the usual way, was filled into the flask, which 

 was wrapped with thick flannel to hinder transmission of 

 heat. The tube D contained phosphorus pentoxide. The 

 filling of the gas tube was carried out as described previously, 

 except that, each time the tap S was closed, the screw-clip 

 was adjusted to allow the gaseous carbon dioxide forming in 

 the flask to escape through a piece of capillary tubing- 

 attached to the pressure tubing. The clip was tightly 

 screwed up before S was opened. The experiments with 

 this gas were carried out at 20° C. and latm.,and the results 

 were as follows : — 



Table VI. 



]S umber of . , , ^^ 

 xr • ! A/2 OCX cm. 

 Jixperiuaent. | ' 2 



X/2 air cm. 



/c'. 



1 | 639 



2 ! 6-39 



3 : 637 



4 ! 636 



8-21 

 8-20 

 8-19 

 818 



1-290 

 1-293 



1-288 

 1-287 





Mean 



.. 1-290 



p c for C0 2 = 72-9 atm.; T c = 304°-4 abs. ; 

 d 2 K = 44-00/28-98. 



Thus 



<£ = 1-0110; * = cp/c„= 1-303; C p -C,=2-037; 

 Cp=8"76 g.cal. ; C„=6-72 g.cal. 



This result is in good agreement with the value found by 

 Partington (toe. cit.) by the method of adibatic expansion : 

 viz., 1*302 at 17°. The values found by other experimenters 

 are shown in the following: table. 



