wliere : 



( 157 ) 



ioq -— = — ^ 



//o 



R V T„ T, 



The ([iiantity '^ iy therefore always smaller than nnity if 



i/o 



^-/^'<^-l (5M 



-^ 1 



The second member being negative, this condition can only be 

 satisfied if ^' has a hii/h positive value. Two cases may therefore 

 occur, according to [3' being larger or smaller. In the first case tlie 

 initial part of the cnr^^e near T^ descends again and a iniiwiiuui 

 ^vill therefore occur (tig. 2). In the second case the curve ascends 

 near T^; it will therefore descend continuously from 7\ to T^ without 

 presenting a minimum. 



For the case 1\ = 1\ the conditions (5) and (5'') pass into 



/? - /3' < 0, 



and a minimum will always in this case occur if ^3' > /?, and 



probabl}^ this will always be the case. 



fdT\ 

 The same considerations apply of course for -, . 



\d,c J, 



In the above considerations we have tacitly assumed that aiiouia- 

 lous components occur in neither of the phases ; formation of complex 

 molecules or dissociation are therefore always excluded in the cases 

 which we consider. When one or both of the components of the 

 solid phase for instance consist totally or partially of double molecules, 

 then the occurrence of a ma.wnum is not excluded at all. 



We now proceed to the discussion of the equations (2) for different 

 values of ^' , starting with very high values. 



IV. In the following we shall always put /? = (in tlie liquid 

 phase). This simplifies the calculations in a high degree and it does 

 not alter the results qualitatively. The equations (2) then take tlie 

 following form : 



Qi 1— .f q^ X 



Let us further assume the following values, in order to be able 

 to execute the calculations numerically : 



