EXPANSION 



317 



and another flowing out. It appears, however, to be proved that the osmose between 

 water and saline solutions, consists not in the passage of two liquid currents, but in 

 the passage of particles of the salt in one direction, and of pure water in the other. 

 Professor Graham observed that common salt diffuses into water through a thin 

 membrane of ox -bladder deprived of its outer muscular coating, at the same rate as 

 when no membrane is interposed. This force plays an important part in the functions 

 of life, and it will be found to explain many of the phenomena associated with Dyeing, 

 Tanning, &c. See OSMOSE FOKCE. 



EXPANSION 1 (Eng. and Fr. ; Ausdehnung, Ger.) is the increase of bulk ex- 

 perienced by all bodies when heated, unless a change in molecular arrangement takes 

 place, as in the case of clays in the potter's kiln. 



Table I. exhibits the linear expansion of several solids by an increase of temperature 

 from 32 to 212 F. ; Table H. exhibits the expansion in bulk of certain liquids. 



TABLE I. Linear Dilatation of Solids by Heat. 

 Dimensions which a bar takes at 212 whose length at 32 is 1-000000. 



