In addition,         s = t_mu      and           

             or        ^{.                  (17)}

Substituting for (t_m) from (16) in (17)

                            Now,   

     Thus,                                  (18)

Equation (21) applies to all types of columns each requiring a different constant (w_m) which is partly determined by the geometry of the distribution system and partly by the capacity ratio of the solute. A function for (w_m) has not been developed for packed LC or GC columns, but due to the geometric simplicity Golay (8) was able to develop the function for the capillary column ,viz.