and Two Jfew Types of Viscosity. 



13 



^Allowing for the proved exceptional behaviour of water, 

 we might regard the values of a t) down to that for isopropyl 

 alcohol to approximate to constancy with a rather large 

 departure in the case of methyl alcohol, but with the higher 

 alcohols a remarkable drop in \ ?7 occurs. 



To test the constancy o£ \ r) Q with a more familiar solute 

 than N(C 2 H 5 ) 4 T or S(C 2 EL) 3 I, the next table has been pre- 

 pared from the available data for the conductivity of KI in 

 as great a variety of solvents as possible. The data for A 

 are that of Kohlrausch for water, those of Walden for ethyl 

 alcohol and acetonitrile, but calculated by me according to 

 (14), those of Vollmer (Wied. Ann. lii. 1894) according to 

 his conclusion that ionic velocities in methyl alcohol and 

 ethyl alcohol can be obtained from those in water by multi- 

 plying by 0*73 and 0*34, that of Schlamp according to his 

 conclusion that ionic velocities in propyl alcohol are half of 

 those in ethyl alcohol, that of Lemme for acetone at 18° 

 calculated by me according to (14), that of Franklin and 

 Cady according to their conclusion that in ammonia at —33° 

 ionic velocities are about 2' 6 times their values in water at 

 18°, that for hydrocyanic acid from Centnerszwer calculated 

 by me according to (14), and that for sulphur dioxide from 

 the data of Walden and Centnerszwer similarly calculated. 

 The values of r) are taken from standard tables, but in the 

 case of liquid ammonia, hydrocyanic acid, and sulphur 

 dioxide, as experimental determinations are not known to me, 

 I have calculated roughly approximate values according to 

 the principle of corresponding states in the manner of Kam- 

 merlingh Onnes as applied by Heydweiller (Wied. Ann. lix. 

 p. 193). These values and the corresponding one of 100\ ?7 

 are marked in the table with a " ? '\ 



Table III. 

 Molecular specific conductivity of KI. 



Solvent. 



Temp. 



V 



V - 



100A 0?7o . 



25° 



152 



•00891 



136 



25 



213 



•00346 



74 



25 



61-5 



•0103 



66 



25 



111 



•0058 



64 



25 



52 



0108 



56 



25 



26 



■020 



52 



18 



278 



•00329 



91 



-33 



395 



•0033 ? 



130? 







288 



•0056 ? 



162? 







1 



476 



•004? 



190? 



Water 



Acetonitrile : . 



Ethyl alcohol (Walden) 



Methyl alcohol 



Ethyl alcohol (Vollmer) 



Propyl alcohol 



Acetone 



Ammonia 



Hycl rocy anic acid 



Sulphur dioxide 



