BKIDGMAN. — THERMODYNAMIC PROPERTIES OF LIQUIDS. 



61 



way from Amagat's data the following values: O.O3I2I, O.O3I43, and 

 O.O3I94, respectively. The corresponding values from the present 

 work to give the correct changes of volume are O.O3I2O, 0,03146, 

 and O.O3I67; rather good agreement except at 60°, where for one thing 

 the linear interpolation from Amagat's data would be accountable for 



1.10 i 



2 3 4 5 6 7 8 9 10 11 12 

 Pressure, kgm. / cm.^ x 10^ 

 Acetone 



Figure 14. Acetone. Volume at 20°, 40°, 60°, and 80°, against pressure. 

 The lower curve is for 20°. The curve for 20° is terminated at 8000 kgm. 

 because acetone freezes at this point. The curve for 80° starts from 1000 

 kgm. because acetone boils at atmospheric pressure below 80°. 



some of the divergence in the direction shown. The values taken as 

 the average were; O.O3I2O, O.O3I45, and O.O3I67. 



The only values we have for Cp are by von Reis, who gives 19.43 

 between 16.4° and 52.6°, 19.65 between 17.6° and 60.3°, 19.68 between 

 18.9° and 70.2°, and 19.72 between 18.7° and 79.1°. These data show 

 an unusually slight increase of Cp with the temperature. 



Carbon Bisulphide. — Three sets of measurements were made on 

 this substance, the first of compressibility and dilatation at low 

 pressures with the larger low pressure bulb, the second of compressi- 

 bility and dilatation over the high pressure range with the smaller 

 high pressure bulb, and the third of compressibilit}^ and dilatation 

 wdth the smaller bulb over the entire pressure range. All of these 

 runs were made without accident of any sort. 



The average discrepancy of the two sets of piston displacements 

 for the isothermal compressibility at 40° was 0.002 inch, on a total 

 stroke of about 2.0 inches. The corresponding discrepancy for the 



