HYDROGEN INTO ATOMS 



185 



At the higher 



511^1 pressures now Deing 



l)einy considered, we may safely place 



VT /Ti = I in Equation 43. We shall also see that under the conditions 

 of our experiments at higher pressures the term FWd in the denominator 

 of (43) can be neglected in comparison with P. 

 Equation 43 thus simplifies to 



K = F^WVP- (58) 



If we substitute this value of K in (50) and carry out the indicated 

 operations, we obtain 



4-57 



2d log Wp , 2d log F ^ 

 'dd/T) 



(59) 



dii/T) 



Now it can be readily shown by taking into account Equations 42, 32 

 and 34 that 



E 



2d log F ^ _T PB^ 

 d(i/T) 2.30 PB + E* 



(60) 



This term is in the nature of a correction term. The first term of (59) 

 is obtained directly by plotting log Wd against i/T. To calculate q we may 

 therefore transform (59) to the following: 



, = _9.4^J^-_,98T^^-^ 



d{im 



PB + E 



(61) 



It is seen that the correction term can never exceed 1.98 T. 



Curves were prepared from the data of Table III by plotting log Wd 

 against i/T. At the higher pressures these curves were very nearly 

 straight lines. The slopes of these lines, multiplied by 9.14, gives the 

 quantities represented by the first term of the second number of Equation 

 61. The values thus found are given in the second column of Table XIV. 



be known. We shall see that B is equal to 0.23/VTa. If we consider that 

 To = T2 and thus calculate B for a mean temperature of 3000, we obtain 



