FLUIDITY AND CONDUCTIVITY. 



159 



TABLE 77. Comparison of the temperature coefficients of conductivity and fluidity. 



Table 77 shows that the temperature coefficients of fluidity and conductiv- 

 ity, in the case of lithium bromide, vary in the same manner, although the 

 latter are, for the most part, smaller than the former. Abnormal results 

 were obtained with cobalt chloride in mixtures of acetone with the alcohols, 

 in so far as the temperature coefficients of conductivity are concerned. 



DISCUSSION OF RESULTS. 



FLUIDITY AND CONDUCTIVITY. 



That there is a parallelism between conductivity and fluidity has been 

 previously pointed out in the introduction to this section; and since the con- 

 ductivity of a solution is dependent, in part, upon its fluidity, we shall first 

 discuss the fluidity curves and then, in connection with them, the conductivity 

 curves. 



When methyl alcohol, ethyl alcohol, or acetone is mixed with water, there is 

 a contraction in volume and an evolution of heat, and we have a large devia- 

 tion of the fluidity curve from a straight line. In other words, we have a 

 marked viscosity maximum a fact which frequently manifests itself when 

 water and organic solvents are mixed. In addition to methyl and ethyl 

 alcohols and acetone, propyl and isopropyl alcohols, propionic acid, butyric 



