BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 031 
'/• 
Difference. 
Bromine. 
9.53 
Methyl ah^ohol. 
650 
-46 
Ethyl alcohol. 
606 
—4C> 
Propyl alcohol. 
560 
15 
Butyl alcohol. 
575 
Isopropyl alcohol. 
490 
Isobutyl alcohol. 
525 
49 
Inactive amyl alcohol. 
574 
Trimethyl carbinol. 
461 
29 
Dimethyl ethyl carbinol .... 
490 
In the case of the primary alcohols, the table shows that up to propyl alcohol a 
rise in molecular weight is accompanied by a fall in the viscosity coefficient, but for 
aU other higher alcohols a rise in molecular weight is accompanied by an increase in 
the coefficient. The alcohols, therefore, differ from most other homologous series 
vffere the value of CHg is positive, and tends to diminish as the series is ascended. 
Conclusions relating to Viscosity Coefficients at Equal Slope. 
1. It is evident, from the foregoing comparisons, that temperatures of ecpial slope 
tend to reveal much more definite relationships between the values of the viscosity 
coefficients and the chemical nature of the substances than were obtained at the 
boiling-points. 
2. In all homologous series, with the exception of those of the alcohols, acids, and 
dichlorides, the effect of CH 2 on the value of the coefficient is positive and tends to 
diminish as the series is ascended. 
3. Of corresponding compounds, the one of highest molecular weight has the 
highest coefficient. 
4. Normal propyl compounds have slightly larger coefficients than the corresponding 
allyl compounds. 
5. An iso compound has invariably a larger coefficient than a normal compound. 
6. In the case of other isomers, the orientation of the molecule and branching of 
