386 MR. P. 0. PEDERSEN ON THE SURFACE-TENSION OF LIQUIDS 



TABLE XVII. 



Solution of Copper Sulphate. 

 p m = 1-0503. 



The mean value of the determination of the surface-tension of this solution is found 



in Table XVI, 



T, 6 = 74-27 dyne/cm. 



The value is practically the same as for water. 



Diluted Sulphuric Acid. 



Of diluted sulphuric acid two different concentrations were investigated. The 

 mean values are (see Table XVI.) 



For p lb = T0813, T 15 = 74'89 dyne/cm., 

 p tb = 1-14316, T 15 = 74-44 dyne/cm. 



The corresponding values, according to GRUNMACH (with capillary-wave method 

 with renewed surface), are 



T 1B = 76-5 dyne/cm, and T J5 = 7 7 '8 dyne/cm. 



Aqueous Ethyl Alcohol. 



DOMKE* has given a table of the results obtained by different authors for the 

 surface-tension of absolute alcohol. The results are reduced to a temperature of 

 15 by the use of dT/dt = 0'08. The mean value of the fifteen values considered is 



T 15 = 23-1 dyne/cm. 



The lowest value is T, 6 = 2 2 '2 dyne/cm., the highest is T 15 = 24'3 dyne/cm. 

 DOMKE himself found by the capillary-tube method, 



T 15 = 23-0 dyne/cm. 

 * DOMKE, -Wiss. Abb. d. K. Norm.-Aich.-Komm.,' Heft III., Berlin, 1902. 



