6\2 



Scentific Proceedings, Royal Dublin Society. 



A 15 c.c. bubble was drawn into the tube at each of the temperatures 

 given, and allowed to attain atmospheric pressure at that temperature by 

 opening the tap connecting it with the air. The tube was then inverted 

 several times and the tap opened after each inversion to make sure that the 

 pressure in the bubble was atmospheric. The bubble was then photographed, 

 and the negative measured in each case. 



Table III. 

 Measurements of 15 c.c. Bubble at .Different Temperatures. 



These measurements show that the length of the bubble decreases with 

 rise in temperature ; but since the volume must be constant, the "diameter 

 must increase as the length diminishes, hence the area will not be affected 

 appreciably by this change in length. 



(c) Effect of the, area of the bubble on the rate of solution. 



To determine the effect of the area of the bubble on the rate of solution 

 a series of five duplicate experiments was carried out at 25° C, using bubbles 

 of 5, 7"5, 10, 12'5, and 15 c.c. The experiments with the first two bubbles 

 were made in a tube of 50 cm. length, as it was thought that too large a 

 fraction of the whole volume of air in the bubble would be absorbed in one 

 double passage up the 100 cm. tube. From these experiments, the values of a 

 and b were calculated, as described previously, 1 from the graph obtained by 

 plotting the rate of solution against air content. 



The observations were reduced to a uniform volume of 100 c.c, and the lines 



1 Part I of this communication. 



