according to van der Waals's Equation. 



521 



9. 



i 



7T. 



w r 



„ 2 . 



0-60 



086868 



043262 



16-730 



1 



95508 



043560 



15-366 



2 



010470 



0-43869 



14-147 



3 



11448 



0-44186 



13052 



4 



12485 



0-44513 



12-067 



5 



13584 



0-44851 



11-177 



6 



14746 



0-45201 



10-371 



7 



15971 



0-45561 



9-6387 



8 



17262 



0-45934 



8-9733 



9 



18620 



0-46319 



8-3660 



0-70 



20046 



0-46719 



78113 



1 



21541 



0-47135 



7-3027 



2 



23108 



0-47565 



6-8355 



3 



24747 



0-48013 



(5-4057 



4 



26459 



0-48478 



6 0093 



5 



28246 



048963 



5-6431 



6 



30109 



0-49469 



5-3041 



7 



32048 



0-49998 



4-9896 



8 



34064 



0-50551 



4-6978 



9 



36160 



0-51131 



4-4259 



0-80 



38335 



0-51741 



41725 



1 



40593 



0-52382 



3-9356 



o 



42933 



0-53058 



3-7141 



3 



45353 



0-53773 



3-5064 



4 



47859 



054531 



3-3113 



5 



50449 



0-55336 



3-1276 



6 



53126 



056195 



2-9545 



7 



55886 



0-57117 



2-7910 



8 



58736 



058107 



2-6361 



9 



61674 



0-59176 



2-4889 



0-90 



64700 



0-60339 



2-3487 



1 



67816 



0-61615 



2-2151 



2 



71024 



0-63019 



2-0867 



3 



74319 



0-64592 



1-9633 



4 



77708 



066368 



1-8438 



5 



81188 



0-68412 



1-7271 



6 



84762 



0-7u817 



16117 



7 



88429 



0-73746 



• 1-4957 



S 



92192 



0-77535 



1*3757 



9 



96048 



0-83028 



1-2418 



100 



1-00000 



1-00000 



1-0000 



B. Comparison with Empirical Formula?. 

 (1) Vapour-pressure Law. 



The values of nr given above were used to test the well- 

 known empirical vapour-pressure law of van der Waals, viz., 



Ioo-tt 



0.-i> 



where /is a constant. Onnes * found that the pressures he 

 obtained by the " free energy" method obeyed the above law 



* Loc. cit. 



