( .^87 ) 



With tlio values found tor a and A/. \ve get: 



I'k = 1^.4 aim. 

 Dewak found =fc 15 atm. 



Tlie critical coefficient X becomes : 

 3 0,9439 3 



SO nearly the normal value 0,375. 



„ ' fTdp\ 



Yin- 1 — — ^ve tind now another value than helbre. In the 



general expression ^) 



''^tl = i + ' 



/) \dTjo 



ill, 



Jc 



" I \f'^^^ - T~^^ ''^' 



P [_i" W'^f^'Jt (ITdh) ill- 



IP 



the factor of -- is now no longer zero. For as — 'z=za(h h ) w( 



dv '^ dl, ''o^^>« 



liave : 





IT 

 as we found « to he independent of T, />„ on the other hand to 



depeml upon T. We tind therefore for the factor of —• 



do' 



We have found above: h,,—h^^ = [/yT, so A„ = /y,^-~|/y 7', and as 

 h^ has been found to be nearlv independent of 7' we i-et 



dT 



-öl/7^'=--,{^/-U. 



<lh 



The factor of — becomes therefoiv : 

 dv 



and with 



"U'-^-ö(^/-V)N 



RT 



p + ~A{^'-^') 



i^-f'j' if>:,-f\,r 



h-i> 



— as acc(n-(hnii" to (1) we have = (1 



we JiCt : 



Ï) V. D. Waals, 1. c. Ill, p. 044. 



