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MR. W. R. BOUSFIELD AND DR. T. M. LOWRY ON THE ELECTRICAL 



case been restricted to dilute solutions, the data for the alkalies being even more 

 scanty than those for acids and salts.* The only figures that we have been able to 

 find are those of KANITZ ('Zeit. Phys. Chem.,' 1897, vol. 22, pp. 336-357), who gives the 

 following table. No measurements appear to have been made in more concentrated 

 solutions : 



The results of our measurements, which were made by means of a new type of 

 viscometer, which need not now be described, are set out in the following Table XIV., 

 and are represented graphically in Diagram VIII. The relationship between the 

 viscosity and the concentration can be expressed by the formula 



77 = l+0'199m 0-01833m 2 + 0-01056m 3 , 



where m is the concentration in gram-molecules per litre, and the values derived 

 from this formula are shown in column 5 of the table. 



TABLE XIV. Viscosity and Fluidity of Aqueous Solutions of Sodium Hydroxide 



at 18 C. 



m = Concentration in gram-molecules per litre. 



H = Hydration in molecules of water per molecule of sodium hydroxide. 



* Data for the conductivity, density, and fluidity of solutions of sodium chloride from N/10 to 3N 

 between C. and 100 C. are given by LYLE and HOSKINO (' Phil. Mag.,' 1902, vol. 3, 487 498). 



