according to van der Waals's Equation. 



523 



\ 

















\ 









































* 







































fc: 

























































































(4-0- 











It is known * that the equation 



(0± C0 2 



is not an accurate expression of the results of observation, 

 but the curvature shown by plotting the foregoing numbers 



* S. Young, Phil. Mag. [5] 1. pp. 291-305 (1900). 



