Expansion of Salt- Solutions. 

 Table III. 



395 





M.V. found. 



M.V. 



2NaCl 



1836-75 

 1876-93 

 192006 

 196383 

 2010-70 



1836-42 

 1876-74 

 191944 

 1963-93 

 2009-66 



4 



6 „ 



8 „ 



10 „ 





KC1 



1827-70 

 1884-58 

 1949-04 

 2013-36 



1827-70 

 1886-8 calc. 

 1949-84 

 2012 calc. 



3 „ 



5 >f 



7 „ 





2NaN0 3 



1858-22 

 1921-31 

 1987-77 

 2051-38 

 2125-07 

 2196-35 



1858-60 

 1922-6 calc. 

 3989-6 „ 

 2058-4 „ 

 21330 „ 

 2202-0 „ 



4 „ 



6 „ 



8 „ 



10 „ 



12 „ 





KN0 3 



3 „ 



1839-18 

 1920-83 

 2007-74 



1839-07 

 1921-15 

 2006-74 



5 „ 









Discussion of the Results. 

 Rate of Expansion. — In every case examined the expansion 

 is a constantly increasing value. This follows from the form 

 of the expression for the volume, 



V= 100,000 + *'a + *' 2 £; 

 for were the expansion uniform it would have the form 



V= 100,000 + t'*. 

 It is, however, to be noted that the more concentrated the 

 solution the more nearly does the curve of volume approach 

 a straight line, as will be seen from Table IV., which contains 

 the ratio of the two constants a and /3, and this increases 

 with the concentration. In fig. 6 these ratios are plotted, and 

 it will be seen that the lines are practically straight, showing 

 the uniform effect of increase of concentration. The volume 

 of water between 20° and 100° C. cannot be expressed by a 

 too constant formula, but if 20°, 60° and 100° be taken, then 

 the expression is 



V = 100,000 + m-8 + ^0-35, 



and the ratio of -~ is 68*0 ; that is, a value lower than smj in 



Table IV. It thus follows that the volume-line of water is 

 more curved than that of any of the salt-solutions examined, 

 even the most dilute. In fig. 7 the volume-curves for water 

 and for the strongest and weakest solutions are given. Again, 



