Vci'pour-density of Bromine at High Temp&i-aturcs. 



17 



The constants of dissociation were calculated as follows : — 

 Taking the fundamental equation u'lur- = Ci/c, where u and Ui are 

 the number of molecules per unit volume of Br2 and Bri respectively, 



and c and Ci the velocities of dissociation and recombination, we have, 

 after reduction, 



c P(80 - D)-^ ^ ^ 



where a is the number of molecules per unit volume of any gas under 

 standard conditions. 



VOL. LXVI. C 



