28 Mr. D. L. Hammick on Surface Energy, 



Toluene. 



T. 



1 



A 



cl 



-20 



72'5 (extr.) 



34-2 



•0 o 353 



•00100 



, -3-05 



-3-53 







79-3 



31-6 



•0,380 



0,103 



3-03 



3-69 



20 



90-8 



29-1 



•0 o 412 



•0 o 107 



2-86 



3-85 



40 



104-7 



26-7 



■0 2 450 



•0 2 113 



2-35 



3-98 



60 



121-6 



24-3 



■0 2 494 



0J19 



2-52 



415 



80 



140-5 



22-2 







2-43 





100 



160-5 (extr.) 



20-2 







2-33 







(7=4-53x10-8 011! 



(from p — 



19-5, X 1 =79-0 at b.p.). 





Nitro- 



benzene. 













T. 



/3. 



p. 



P- 



a. 



1 



Qp' 



d 



P. 



a 







44-7 



443 



•0 2 273 



•0 3 83 



-3-29 



-329 



10 



47-3 



43-1 



•0 2 279 



•0 3 834 



3-24 



3-34 



20 



50 



41-8 



•0,/288 



•0 3 837 



3-16 



3-44 



30 



52-8 



40-6 



•0 2 297 



•0 3 847 



3-08 



3-50 



40 



55-6 



39-5 



•0 2 305 



•0 3 856 



3-00 



356 



50 



58-4 (extr.) 



38-3 



•0 2 314 



•0 3 863 



2-95 



3-64 



60 



61-4 „ 



37-7 



•0 2 319 



•0 3 869 



2-86 



3-67 



d= 4-16x10-8 cm. (from p = 21-2, \ x = 71-2 at b.p.). 



It is apparent from 

 J_ 1 

 /8J 



the above tables that the ratio 



€ =. ~ =. #- tends to approximate to - at lower tempera- 



tures, and to the value — 2 at higher temperatures (near the 

 boiling-point in many cases). The course of the variation 

 of e with temperature is shown for a few examples in the 

 accompanying figure. For each liquid two curves have been 

 drawn. The upper curve in each example shows the varia- 

 tion of the ratio - (vertical axis) with temperature (horizontal 



