BRIDGMAN. — THERMODYNAMIC PROPERTIES OF LIQUIDS. 



71 



and 0.0202, against 0.0492, 0.0322, 0.0248, and 0.0199 of Amagat. 

 The agreement is rather good, except at the lowest pressure, where 

 agreement is not to be expected. The just published value of Richards 

 for the change of volume at 500 kgm. and 20° is 0.0446, against 0.0487 

 given in the table, which is essentially that of Amagat. 



1.00 



E 

 o 



I 



1 2 3 4 5 6 7 8 9 10 U 12' 



Pressure, kgm. / cm.^^xJO^ 



Ethyl. Bromide/ 



Figure 18. Ethyl Bromide. Volume at 20°, 40°, 60°, and 80° plotted 

 against pressure. The lower curve is for 20°. The curves for 60° and 80° 

 start from 1000 kgm. because the boiling point at atmospheric pressure is 

 below 60°. 



The volume of ethyl bromide as a function of pressure and tem- 

 perature is given in Table XIV and in Figure 18. 



When the computations of this paper were made the only value 

 for the compressibility at low pressures was that of Amagat at 99° 

 and a mean pressure of 20 atmos. This was too far removed from the 

 range of this paper to justify any correction. The initial compres- 

 sibilities at 20° and 40° were taken, therefore, so as to give the values 

 of the changes of volume listed in the tables; O.O3I248 and O.O3I476 

 respectively. At 60° and 80° the compressibility is not given for 

 pressures lower than 1000 kgm. The recently published data of 

 Richards give for the compressibility at atmospheric pressure and 

 20° the value O.O3IO6, considerably lower than the value gi\en above. 



Regnault^* gives a few values for Cp at atmospheric pressure; 

 14.62 between 5° and 10°, 14.42 between 10° and 15°, 14.54 between 

 15° and 20°. The temperature range is too small and the variations 



54 Regnault, 1. c. (1843). 



