some Thermodynamical Relations. 



35 



abscissae are the ratios of the absolute temperatures of carbon 

 bisulphide to those of water at those vapour-pressures. As 

 might be expected, some of the points representing the rela- 

 tion of the ratios of the absolute temperatures to the tempe- 

 ratures of water fall slightly to one or other side of the straight 

 line drawn to pass through them. In order to find the error 

 involved in these slight deviations from the straight line, 

 points on the line itself corresponding to the same tempera- 

 tures of water were read off, and these are given in the table as 

 smoothed ratios. Lastly, the absolute temperatures of carbon 

 bisulphide were calculated by multiplying those of water by 

 the smoothed ratios; and the recalculated temperatures of 

 carbon bisulphide are given together with the observed -tem- 

 peratures. It will be seen that the difference between the 

 observed and recalculated temperatures is very small. 



Pressures. 



Absolute 



temperatures 



of water. 



Ratios of 

 absolute 



temperatures 

 of CS 2 to 



those of H 2 0. 



Smoothed 

 ratios. 



Recalculated 



absolute 



temperatures 



of CS 2 . 



Observed 



absolute 



temperatures 



of CS 2 . 



millim. 



o 







o 





50 



311-3 



•8161 



•8160 



254-0 



254-05 



100 



324-7 



•8245 



•8242 



267-6 



267-7 



150 



3331 



•8301 



•8296 



276-3 



276-5 



200 



339-6 



•8339 



•8338 



283-2 



283-2 



300 



348-9 



•8403 



•8400 



2931 



2932 



400 



3560 



•8448 



•8449 



300-8 



300-75 



500 



361-7 



•8485 



•8483 



306-8 



3069 



600 



366-5 



•8517 



•8519 



312-2 



31215 



700 



370-7 



•8545 



•8545 



316-8 



31675 



800 



37445 



•8567 



•8571 



320-9 



320-8 



900 



377-8 



•8589 



•8590 



324-5 



324-5 



1000 



380-85 



•8612 



•8611 



327-95 



3280 



1500 



393-2 



•8695 



•8692 



341-8 



341-9 



2000 



402-5 



■8753 



•8757 



352-5 



352-3 



3000 



416-5 



•8852 



•8850 



368-6 



368-7 



5000 



435-85 



•8987 



•8978 



391-3 



391-7 



In the equation R^K + c^ — t) the value of c = *0006568. 



The greatest difference between the observed and recalcu- 

 lated temperatures is at the highest pressure (5000 millim.), 

 and is only o, 4. 



D2 



