Heats with Temperature and Density. 527 



For the calculation of C p — C t . the equation 



Xbvh 



was used. Values of I ^m I were obtained by interpolation 



from the tables given by Kamsay and Young (loc. cit.). 



~r\Yl\ 



For the determination of (sr- ) , isothermals were drawn; 



\Ov/ T 



the tangents at the required points gave the corresponding 



values of (^-) . 

 \OV/t 



The following results were thus obtained : — 



T. 100C. 



T. 193°-8 C. 



V. C P -C V . 



V. Cp-Cv. 



61-67 -0523 



12-42 -1640 



55-97 -0528 



1075 -2157 



52-20 -0536 



9-76 -2600 



50-35 -0515 



8 45 -3684 





7-81 -4895 



T. 150° C. 



7-16 -0787 





652 1-0747 



65-31 -0401 



5-88 2-2573 



5681 -0460 



4-92 9-5409 



51-56 -0484 



4-60 21-225 



44-67 -0543 



3-798 21-673 



41-26 -0553 



3-508 16-706 



37-84 -0602 



3-217 8-9250 



34-46 -0630 



2-929 3-8364 



31-07 -0672 



2 856 2-6041 



27-68 -0740 



2-785 ] -7425 



24-29 -0876 



2-713 1-0933 



1947 -1145 



2 641 -8008 





2584 -7080 



T. 185° C. 





12-06 -1897 



T. 200° C. 



10-44 -2632 



9-76 -2332 



9-48 -3205 



8-45 -3356 



8-21 -5090 



7 81 -4279 



7-58 -7625 



6-52 -7711 



6-96 1-3072 



5-88 1-1079 



6-33 2 1100 



5-24 1-7769 



2-424 -7048 



2-75 -7861 



2-376 -5045 



27 -7214 



2-330 -4466 



2-6 -6138 



2-262 -4025 



2-5 -5267 



V is the volume of 1 gram in cubic centimetres, and 



C p — C v is expressed in calories. 



