1903-4.] The Viscosity of Aqueous Solutions of Chlorides, etc. 233 
and described in Ostwald-Luther ( Phys . Chem. Messungen, 
p. 260). In every experiment the time of flow was observed 
six or seven times and the mean of all the readings taken ; also, 
in many cases duplicate determinations were made, but no 
difference in the mean result was obtained except at 0° C., where 
a difference of O' 1-0 ’2 sec. in 150 sec. w r ere obtained; the times 
were measured by means of a stop-watch, giving 0'2 sec. 
In every case the viscosity of the solution is referred to the 
viscosity of water at 0° C. as unit = 1 ; for convenience of com- 
parison, the viscosity of water at the temperature of experiment is 
added. The temperature at 15° and 25° did not vary 0T°, but 
the low temperature varied between 0*1° and 0T5°, and the data 
are corrected to 0° C. We made determinations of the relative 
viscosity of water with each of the three tubes used in the other 
experiments, and the results given below are the means of all the 
five values obtained at each temperature :■ — 
1-000 
15° 0*6395 
25° 0-501 
1-000 
0-638 
0-501 (Thorpe and 
Rodger) * 
1-000 
0-637 
0-500 (Hosking ). t 
Table I . — Potassium Chloride. 
Temp. 
Mol. per 
litre. 
Density. 
Viscosity. 
Viscosity of 
Water. 
0° 
1 
1-0480 
0-931 
1-000 
2 
1-0935 
•886 
3 
1-1371 
•880 
15° 
1 
. 
1-0455 
•622 
0-640 
2 
1-0901 i 
•615 
3 
1-1333 j 
•625 
25° 
1 
1-0433 
•502 
0-501 
2 
1-0877 
•507 
3 
1-1295 ! 
•517 
* Phil. Trans., 185, p. 397 (1894). 
f Phil Mag. (5), 49, p. 274 (1900). 
