( 167 ) 



Tlie ('losesf roncordaiice hctwocii tlic observed and llie calculated 

 >alnes of ,v^ seems to bc found at the edges of tlie curves. 



Van dek Waals derived from the eiiualion of ( ^- ] for both phases: 



'«'1 Xi 



1-.V. 



in which 



f*.'i 



d{l,r 



and 



f^.vi 



1 /p 



Mm 



yUc- MI{T[o,j{r-h,;) 



With the aid of the obser\'ed ,i\ and .f.^ we may derive fx'.t, as 

 function of x^ from this equation. Tlie values found in this wax are 

 given in Table IV. For ,i'i smaller than J and larger tliau 0,9 the 

 values of ft'xi are too inaccurate, so that they are not given for the 

 borders of the curves : 



TABLE IV 



Tlie function ^i'./, as funclioji of .>\ has been graphically represented 

 in fig. 2. Evidently the points give a [)retty continuous curve. 



It appears from the table that /t .., a|)proaches to for higher 

 values of ,7;. This is in accordance with the lad that the /u'-line has 

 a maximum on tiie cthei- side, so for ./■, :^ 1 . 



Van df.k W.vai-s has gixon ^) an ('.\|»iicil ('.\|)rcssi()n for /> as function 



1) VAN DER Waals, Vers;!. K. A. v. W. Amsterdam, Januari ISÜl, bl. 401); 

 Gontinuitat II, p. 140. 



