ON THE HALOGEN HYDRIDES AS CONDUCTING SOLVENTS. 



TABLE XL 



117 



RAMSAY and SHIELDS also showed that another class of liquid exists, for which the 

 above relation does not hold, inasmuch as the coefficient not only was less than 2 '12, 

 but also varied with the temperature. If a tangent is drawn to the curve, for a 

 liquid of this class, it will cut the temperature axis at a point above the critical 

 temperature. 



This abnormal behaviour is explained by the assumption that the molecules of such 

 liquids are associated to form larger molecular complexes ; in other words, that their 

 molecular weights are abnormally high. Hydrogen chloride and phosphide, from the 

 magnitude of their temperature coefficients, must be classed with the abnormal or 

 associated liquids, but the curves which we have obtained are too short to be 

 distinguished from straight lines. These curves have, however, been produced and 

 the results are shown in fig. 8 and Table XI. 



MOL SURFACE ENERGY. 

 Fig. 8. 



