348 DR. A. DUPRE ON THE SPECIFIC HEAT AND OTHER 
In the formation of 5 grms. of this solution are absorbed, at a temperature of 
8*9, 34‘25 units of heat. 
66-55, 21-00 „ „ 
Difference 13-25 „ „ 
To heat 5 grms. of the solution from 8°-9 to 66°-55 requires 24-500 units. 
To heat the water contained in the 5 grins, to the same extent requires 253-30 units. 
KC1 one molecule, or 7-952 per cent. 
H 2 0 fifty molecules, or 92-048 „ 
Specific heat of solution, according to Thomson, -904. 
In the formation of 5 grms. of this solution are absorbed, at a temperature of 
9- 0, 23-85 units of heat. 
64-3, 13-95 „ 
Difference 9-90 „ „ 
To heat 5 grms. of the solution from 9° to 64 0- 3 requires 249-95 units. 
To heat the water alone „ „ „ 254*50 „ 
Solution of Sodium Chloride. 
Na Cl one part. 
H 2 O 7-28 parts. 
Specific heat of the solution, as calculated from Thomson’s Tables, -8747. 
In the formation of 5 grms. of this mixture are absorbed, at a temperature of 
0 - 2 C., 11-25 units of heat. 
10- 3 C., 9-00 „ 
17T C., 8-15 „ 
70 C., 0-00 „ 
To heat 5 grms. of this solution from 0°-2 to 70° requires 305-25 units. 
To heat the water alone „ „ ,, 306-85 units. 
Solutions of Potassium Nitrate. 
KN 0 3 one molecule, or 9-09 per cent. 
II 2 O fifty-six molecules, or 90-91 per cent. 
Specific heat of this solution, calculated from Thomson’s Tables, *909. 
In the formation of 5 grms. of this solution are absorbed, at a temperature of 
5*5, 36-45 units. 
28-8, 34-85 „ 
Difference 1-60 „ 
