BRIDGMAN. — THERMODYNAMIC PROPERTIES OF LIQUIDS. 



63 



The density at 0° and atmospheric pressure was assumed to be 

 1.292. The three constants of the dilatation formula were as follows: 

 a = O.O2II4O, b = O.O5I37, and c = O.O7I9I.** 



Amagat did not measure the volume of CS2 at 40° at less than 600 

 atmos. The change of volume between 1 and 500 kgm. was found, 



1.10 



'^. 1.00 



E 



E 



O 

 > 



.90 



.80 



3 4 5 6 7 8 

 Pressure, kgm. / cm.^ x 

 Carbon Bisulphide 



10 11 12 



10 



Figure 15. Carbon Bisulphide. Volume at 20°, 40°, 60°, and 80° plotted 

 against pressure. The lower curve is for 20°. 



therefore, by subtracting the value found here for 500-1000 kgm. 

 from Amagat's value for the change 1-1000 kgm., giving the result 

 0.0427 between 1 and 500 kgm. Amagat's value for the volume at 40° 

 and 1 kgm. is 1.0484 against 1.0490 given by the formula above. The 

 present low pressure determinations gave results consistently' higher 

 than those of Amagat: These values were as follows: 0.0476 (not 

 accurate) for 1-500 atmos., 0.0295 between 500 and 1000, 0.0227 be- 

 tween 1000 and 1500, 0.0198 between 1500 and 2000. For the same 

 pressure intervals Amagat has 0.0387, 0.0277, 0.0222, and 0.0183. 



The volume of carbon bisulphide as a function of pressure and tem- 

 perature is shown in Table XI and in Figure 15. 



The initial compressibilities at 20°, 40°, 60°, and 80° may be found 

 from Amagat to have the values O.O49O, O.O3IO7, O.O3I28, and O.O3I49 

 respectively. The corresponding values required to give the change 

 of volume listed in the tables are O.O492, O.O3IO7, O.O3I33, and O.O3I5O; 

 good agreement. Rontgen also gives O.O487 at 20°. The values 



44 Pierre, 1. c. (1845). 



