﻿c. 



C-18-lw 



24-7 



6-6 



428 



6-6 



77-9 



5-5 



186-0 



50 



and Expansions of some Liquids. 149 



on pure sulphide of carbon, taking for the specific heat of this 

 liquid the number 0*238. Five series of observations, made 

 during these researches, served to determine the equivalent in 

 water of the balloon containing the liquid, with the interior 

 thermometer, which showed the temperature stationary at 43 0, 59 

 at the moment the balloon was immersed in the calorimeter. 



The calorimeter, in every case, contained 140 grms. of water, 

 to which must be added 13 grms. as the equivalent of the vessel 

 and the thermometer. The balloon contained about 44 grms. of 

 sulphide of carbon, or of each solution a weight determined by 

 a preliminary experiment to obtain always the same heating of 

 the calorimeter. 



Sulphur: S + rcCS 2 . 

 n. c. p. 



1 0-229 108 



2 0-232 184 

 4 0232 336 



10 0-235 792 



18*1 represents the molecular heat of sulphide of carbon ; the 

 last column expresses therefore the amount by which the pre- 

 sence of an atom of sulphur increases the specific heat of the 

 solution. 



According to M. Person, the specific heat of melted sulphur, 

 between 120° and 150°, is 0*234 • its atomic heat is therefore 

 7*5 ; but the number would certainly be less, if it could be de- 

 termined at a temperature of from 18° to 43°. 



Thus the atomic heat of sulphur dissolved in sulphide of car- 

 bon is only a little less than that of melted sulphur, and is 

 diminished in only a slight proportion by a considerable dilution : 

 in fact4he last solution contains only 4 per cent, of sulphur. 



Phosphorus: P + rcCS* 

 n. c. 



I 0-219 



i 0-222 



1 0-225 



2 0-229 

 4 0-2295 



According to M. Person, the specific heat of melted phosphorus 

 would be 0*2045, consequently its atomic heat 6'3. 



Phosphorus enters, then, with all its specific heat into con- 

 centrated solutions in sulphide of carbon. This heat diminishes 

 gradually, but very slightly, in solutions more and more dilute. 



Bromine. — I first determined, as a means of control, the specific 

 heat of liquid bromine compared with sulphide of carbon. For 

 this purpose I had to operate on 90*5 grms. of bromine. 



For its specific heat between 18° and 43°-6 I found 0-1125. 



p. 



C. 



C-18'lrc. 



50 



109 



6-4 



69 



15-3 



6-3 



107 



24*2 



6-1 



183 



41*9 



5-7 



335 



76*9 



4-5 



