188 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



drawn through these points. At intermediate concentrations the true 

 curves may vary considerably from the curves as drawn, particularly at 

 concentrations in the neighborhood of the axes. Nevertheless, the curves 

 show in a general way the relation between the fluidity and the com- 

 position of these mixtures. The fluidity curves of all mixtures in which 



25 



50 



IS 



too 



Per? 



FIG. 42. 



Representing the Fluidity of Mixtures of Acetone with Various Solvents at 

 as a Function of Composition. 



water is one component are characterized by a pronounced minimum, 

 which lies roughly at a composition of 50 per cent. When the fluidity 

 of the second solvent differs greatly from that of water, the minimum 

 is displaced in the direction of the solvent having the lower fluidity. In 

 mixtures of solvents of the same type, such as methyl and ethyl alcohols, 

 as well as in mixtures of the alcohols and nitrobenzol, or the alcohols and 

 acetone, the curves approach more -or less closely to straight lines, the 

 viscosity of the mixture being throughout intermediate between that of 



