﻿



of Phosphorus, Sulphur, and Aldehyde. 525 



k (Table V.) is calculated by the formula 



— -7- = kF log ~ : . 



dt 6 P — p' 



It is evident that the formula in which the velocity of the 

 reaction is put proportional to the square root of the pressure 

 is in much better agreement with the truth than that in 

 which it is put proportional to the pressure itself. 



The curves in fig. 6 represent the connexion between the 



Fig. 6. — Sulphur and Oxygen. 

























^^5 





























KHIH 























KUHH 











P || 



E3 











fiSSSI 























PH 



j^^H^^B^^j 





[OM 













5 



jUHR 























WKStSft 

























BH? 























































































400 

 Pressure. 



600 



velocity of the reaction and the pressure. Curve I. is drawn 



dv 

 with the values of -5- as ordinates and pressures as abscissae. 



It has a strong general resemblance to the curve representing 

 the velocity of the reaction between phosphorus and dry 

 oxygen. The velocity continuously increases as the pressure 

 falls. Curve II. is drawn with ordinates proportional to the 

 square roots of the corresponding pressures. The experi- 

 mental values of the velocity of the reaction corrected for the 

 rate of evaporation of the sulphur, viz. : 



dv A P 



dt/ l °ZF^» 



800 



