CONCEENING THE EfFECT OF GrAVITY ON THE CoNCEXTRATlON 



OF A Solute. — By Harold S. Davis^ B, A., Dalhoiisie 

 College, Halifax, ?T. S.* 



Read 31.-t M.iy, 1911. 



Suppose that a solution of uuifonn concent ration is placed 

 in a tulie of constant cross-section and of vertical height, /, and 

 is exposed to the influence of gravity. 



In general the eoncentratif>n must now change throughout 

 the solution in order to produce equilibrium which obtains after 

 an infinite time. 



If (Fig. 1) the height 

 of the tube is represented 

 by M 'N, and the concen- 

 tration at any point by a 

 distance x perpendicular 

 to M. N, then o: will trace 

 out a line A B represent- 

 ing the concentration of 

 the solution at any point. 

 At the beginning, A B will 

 l)e a straight line parallel 

 to X y. At final equil- 

 ibrium it will be a straight 

 line which lis in general 

 inclined to M N. See L. 

 Vegard, Contributions to 

 the Theory of Solutions, 

 J^hil. Mag., series 6, no. 

 77, page 258). For any 

 time t less than infinity, AB will represent the distribution of 

 the solute. 



'Published in this part by permission of the council of Ihc N. .S, Institute of 

 Science. 



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