THE CONDUCTANCE OF SOLUTIONS VISCOSITIES 127 



the viscosity increases with increasing pressure, as was found by Ront- 

 gen 18 and Warburg and Sachs 19 for ether and benzene, and by Cohen 

 for turpentine. In general, the viscosity effect in non-aqueous solvents 

 is greater than that in water, and, as we shall see below, the effect is 

 the greater the greater the viscosity of the medium. 



The pressure-viscosity effect in solutions is a function of the con- 

 Pressure in Atmospheres. 

 O ZOO MOO 000 800 1000 



Fia. 22. Showing the Influence of Pressure on the Viscosity of Water at Different 



Temperatures. 



centration, as was shown by Cohen. In Figure 23 are shown curves 

 for the viscosity change of solutions of sodium chloride in water at 2 

 and 14.5. The broken line curves relate to the lower temperature. 

 The concentrations of the various solutions are indicated on the figure. 

 With increasing concentration of the solution, the viscosity decrease, due 

 to a given increase in pressure, diminishes and ultimately changes sign; 

 that is, with increasing pressure, the viscosity of the solution increases. 

 The lower the temperature, the greater the influence of a given pressure 



"Rontgen, TFied. Ann. 22, 510 (1884). 



Warburg and Sachs. TFied. Ann. 22, 518 (1884), 



