[ 143 J 



XIII. 



THE DETEEMINATION OF THE EATE OF SOLUTION OF 

 ATMOSPHEEIG NITEOGEN AND OXYGEN BY WATEE. 



By W. E. ADENEY, D.Sc, A.E.G.Sc.L, F.I.G., 

 Acting Professor of Chemistry ; 



AND 



H. G. BECKEE, A.E.C.Sc.L, A.I.C., 



Demonstrator in Chemistry ; 

 Eoyal College of Science for Ireland. 



[Head ApitiL 27. Tublished Septemiseu 17, 1020.] 



Part III. — The Bate of Solution of Air hy Qidescent Waters under Laboratory 



Conditions. 



In previously published parts of this communication the rate of solution of 

 gases by water, when thin films of the water are exposed to the gas or gases, 

 and kept uniformly and rapidly mixed with the unexposed portions of it, has 

 been dealt with, and shown to take place in accordance with a simple law. 



With a view to deriving, if possible, a formula for the rate of solution of 

 air by quiescent bodies of water, the results thus obtained have been applied 

 to the elucidation of a number of experiments which had been previously 

 made with small volumes of still water, and the results are given in this 

 communication. 



"When the process of solution of air by water is considered, it is evident 

 that it may take place in one of three ways — (1) Solution at the surface 

 exposed to the air with thorough and rapid mixing with the unexposed 

 portions ; (2) solution at the surface with no mixing ; (3) solution at the 

 surface with slow or imperfect, mixing. 



The conditions stated under section (1) are practically those obtaining 

 in the experiments already described, and hence under these conditions the 

 formula already deduced would apply. However, these conditions do not 

 ordinarily occur. 



The conditions stated under section (2) are those which are commonly 

 assumed to obtain, although there seems to be very little justification 



ggiENT. PBGC. E.D.S., VOL. XVI., NO. XIII. U 



