According to distribution law, the distribution of solute in two phases is given by the expression, <br> $K = \frac{{{\rm{concentration }}\;{\rm{of }}\;{\rm{solute }}\;{\rm{in }}\;{\rm{phase }}\;{\rm{I}}}}{{{\rm{concnetration }}\;{\rm{of}}\;{\rm{ solute}}\;{\rm{ in }}\;{\rm{phase }}\;{\rm{II}}}},$<br> the numerical Value of constant $K$ depends upon :