44 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



The reduction factor from the mathematical formiihi for volume 

 in terms of pressure at 40° was 0.9979. 



The density at atmospheric pressure and 0° was taken as 0.8063. 

 The constants of the dilatation formula of I/andolt and Bornstein 

 were a =0.0,1022, b =0.06182, c =0. The values of the volume given 



0123456789 10 U 12 



Pressure, kgm. / cm.^ x 10^ 



Ethyl Alcohol 



Figure 9. Ethyl Alcohol. Volume at 20°, 40°, 60°, and 80° plotted 

 against pressure. The lower curve gives the volume at 20°. 



by this formula are 1.0212, 1.0138, and 1.0679 at 20°, 40° and 60° 

 respectively. We also have values of Pierre ^^, which are 1.0216, 

 1.0448, and 1.0695 at the same temperatures respectively. 



Amagat gives .0484 for the change of volume from 1 to 500 kgm. 

 His value for the volume at 40° is 1.0442 against 1.0438 above. In 

 the tables, 0.0484 was used as the change of volume 1-500, and 1.0438 

 as the volume at atmospheric pressure. At 20°, the change of volume 

 between 1 and 500 atmos. was found to be 0.0477 against 0.0438 of 

 Amagat. The numbers for the succeeding 500 atmos. intervals were 

 0.0287, 0.0236, 0.0193 against 0.0297, 0.0228, and 0.0188 of Amagat. 



The volume as a function of pressure and temperature is given in 

 Table III and in Figure 9. 



The initial compressibilities at 20°, 40°, 60°, and 80°, computed as 

 described, were found to be O.O3IO5, 0.0,121, 0.0^138, and O.O3I5I, 

 respectively. The corresponding values of Pagliani and Palazzo are: 

 O.O3IO2, O.O3II4, O.O3I3O, and O.O3I5I. The agreement is as good as 



15 Pierre, Am. chim. et phys., 19, 199 (1847). 



