FLUIDITY. 



199 



greater in acetone than it is in water, and that the viscosity of acetone is very 

 much less than that of water. 



The temperature coefficients of fluidity increase in all the mixtures, with the 

 exception of the 100 per cent mixtures, with increase in dilution; and the 

 largest coefficients are in the 25 per cent and 50 per cent mixtures; the values 

 in these two cases being identical to the fourth decimal place. 



Tables 84, 85, and 86 (fig. 101) show that potassium sulphocyanate, in 



260 



340 



220- 



200- 



180- 



"3 140- 



120- 

 100- 



80- 

 60- 

 40- 



IV 



50^ 

 Percentage of Acetone 



FIG. 100. 



100$ 



Curve I, fluidities of mixtures 

 of acetone and water at 0. 



Curve II, fluidities of N/10 

 potassium sulphocyanate in mix- 

 tures of acetone and water at 0. 



Curve III, fluidities of the 

 above solvent mixtures at 25. 



Curve IV, fluidities of potas- 

 sium sulphocyanate in the above 

 solvent mixtures at 25. 



mixtures of acetone and methyl alcohol, exhibits a marked maximum which 

 disappeared at 25. The curves at 25, however, show an increase in 

 the fluidity at 0, in the 75 per cent mixtures, but that this maximum has 

 values above the average values for the two solvents. It is to be noted 

 also, that although the increase in fluidity with increase in dilution is 

 nearly the same in acetone and methyl alcohol, yet this increase is very 

 much greater in the mixtures, and especially in the 50 per cent and 75 per 

 cent mixtures. 



Tables 84, 85, and 86 (fig. 102) show that tenth-normal potassium sulpho- 

 cyanate, in mixtures of acetone and ethyl alcohol, exhibits a maximum in 

 fluidity in the 75 per cent mixture at 0. The pure solvent at 0, and the 

 solutions and solvent at 25 do not exhibit this maximum, although they do 



