( 69i ) 



?/, -Ik ^ Vlc -Ik / 



2 7V ).' 4 2Y- A= 



1 



i^A; VI; 



^r-K --3-' p/.^'/ c, - - 



Tkv ~ 27',.^ (2) 



As specific beat c„ in the ideal gas state we have taken 

 0,17.419.10' = 71,2 X 1^' ')' ^^^^ it is considered constant. For Ihe 

 critical constants we have used 



J\.= 304,5°, p!.= 73.1014.10^ = 740.10^-^— 



from the experiments of Amagat and 



V = 2.20 — from the experiments of Kuenen and Robson ') 



yk gr 



deduced by the law of the rectilinear diameter. 



The assumed critical values give : 



;. = 0,001044. 



With (1) and (2) have been calculated 



a) (ive points belonging to the ideal gas state, wiiere v,, is taken 

 as 180: 



1. for t = 0.40 vy =180 



tj =43,1X10^ 

 8 =300X10' 



2. for : = 0.60 v,j = 180 



7j =71,8X10^ 



f = 46 X 10' 



3. for t r= 0.68 Vy — 180 



ij = 81 X 10' 

 g = 64 X 10' 



4. for : = 1 Vy ^ 180 



,1 =108X10' 

 i =133X10' 



5. for i = 1,18 Vy = 180 



^ =120X10' 

 8 =173X10' 



h) two points on the gaseous branch of the connodal line for which 

 Kuenen and Robson (loc cit) have given the values of T and v 



1) Sufficiently near the vahie given by Regnault. 



2) Kuenen and Robson, Phil. Mag. G p. 149, 1902. 



46 



Proceedings Royal Acad. Amsterdam. Vol. VI. 



