68 Influence of Condition on Vapour-pressure. 



jp = a + 6a',a=4-82602 ; log=0'5784772 ; loga=l-9959086; 

 t = f Centig. + 10 ; b is negative. 



The following table comprises (A) the values calculated 

 from the vapour-pressures of the liquid ; (B) those calculated 

 from the formula and constants given by Fischer ; (C) those 

 calculated from Fischer's results by Biot's formula ; and (D) 

 those calculated from our results by Biot's formula. 



Temperature. 



A. 



B. 



C. 



D. 





millim. 



rnillim. 



millim. 



millim. 



5°58 



35-89 



35-62 



35-85 



35-86 



4-58 



33-52 



33-36 



33-62 



33-39 



3-58 



31-27 



31-42 



31-50 



31-07 



2-58 



29-13 



29-54 



29-50 



28-90 



1-58 



27-08 



2773 



27-61 



26-85 



0-58 



25-14 



25-97 



25-82 



24-94 



-0-42 





24-28 



24-14 



23-14 



1-42 





22-65 



22-55 



21-46 



242 





21-09 



21-06 



19-89 



3-42 





19-59 



19-66 



18-41 



4-42 





1815 



18-33 



1704 



5-42 





16-77 



17-09 



15-75 



6-42 





15-45 



15-92 



14-56 



7-42 ' 





14-20 



14-82 



13-44 



8-42 





13-01 



13-79 



12-40 



942 





11-89 



12 ; 82 



11-43 



10-42 









10-53 



11-42 









9-69 



12-42 









8-91 



It is possible to calculate the heat of fusion of solid benzene, 



dp 



from the value of -j- at the melting-point, from the equation 



dp 

 di 



dt 



(solid) 



^ (liquid) =-—- 



where V is the heat of vaporization at the melting-point, and 

 F the heat of fusion. 



With Fischer's formula and constants . F = 6*29 calories 

 With Fischer's results and Biot's formula. F = 2 1 ■ 1 „ 



With our results and Biot's formula . . F = 35*4 „ 



The number found by Fischer . . . . F = 30*085 „ 

 The number found by Peterson and 



Widman F = 29'09 „ 



From these numbers it is evident that, although our con- 

 stants are not perfectly correct, yet they agree better with 

 experimental evidence than those of Fischer. 



