643 



for doublets : 



B = B^\l — 0.31 30 f(7„^, — 0.0 1 I 7.5 ta,!,.) — 0.00044 tiin,.) ... -I (21) 

 Table I contains some values calculated from (20) and (21) 

 respectively. 



TABLE I. 



The table also gives some values calculated fiom the equation 



B^B^ jl_0,5t~lj, (22) 



wliicli follows fi'om v.\N dkr W.vals' equation with constant nw, b\\ 

 and Rw, and some values calculated from the equation 



B=B^\l- 



(23) 



which is obtained from Clausius' and Berthelot's assumption: 



As appears from table 1, the difference between the values of B 

 for quadruplets and for (Joublets is small in the temperature region 

 considered here, i. e. above 0.75 J',„,.(;=o), viz. smaller than l"/» of 

 B^ , or 2.37„ of B. 



Hence the circumstance of a diatomic molecule possessing or not 

 possessing a doublet, has but a small influence on the dependence 

 of B on temperature in this temperature region. This leads one to 

 expect that in the considered region of temperature and density the 

 equation of state of diatomic compound gases and that of diatomic 

 elementary gases will not be easily distinguished from each other. 



From table 1 it appears further, that the values of i? for quadruplets 

 and for doublets both deviate vei'y little from equation (23), viz. 

 over the whole region above (X75 Ti„,,.(p=u) less than O.G"/» of the 

 value of Brr, , and less than 1.5°/,, of the value of B. 



