HYDROGEN INTO ATOMS 



187 



these, the corresponding degree of dissociation at atmospheric pressure 

 and at i mm. pressure were calculated by solving the equation : 



x^/ {i-x) =K/P 

 where x is the degree of dissociation and is equal to 



X = pi/F. 



(66) 



(67) 



The results of these calculations are given in the third and fourth 

 columns of Table XV. 



TEST OF THE THEORY 



By examining Equations 31 to 34, we see that, by a knowledge of the 

 values of K, q, Tg, B, C, and E, we should be able to calculate Wd for 

 any temperature and pressure. By comparing the results of these calcula- 

 tions with the observations (Table III), we are enabled to test the validity 

 of the assumptions made. 



Before making such calculations it is necessary to determine the nu- 

 merical value of the coefficient B. We have already seen that the maximum 

 value of Wo which we have denoted by Wmax. is not subject to error 

 through the uncertainty in the actual pressures within the bulb. Equation 

 44 is therefore particularly well adapted for the calculation of B. 



By substituting the values of Wmax. from Table VIII in Equation 44, 

 together with the corresponding values of K and E and solving the result- 

 ing equations for B, the average result is found to be 



B = 0.23/VTa. 



(68) 



