528 On the Distillation of Liquid Air. 



always exactly the same in the same apparatus, and a small 

 quantity of gas bubbled through the liquid, such as Estreicher 

 used, by no means lowers the temperature to the true boiling- 

 point. In order to do this, a rapid current must be passed 

 through, and this would naturally yitiate the vapour-pressure 

 measurements. The values of the vapour-pressures are com- 

 pared in the following table. In the first column are given 



Vapour-pressures of Oxygen. 



Temperature 

 (absolute). 



62° 



63 



64 



65 



66 



67 



68 



69 



70 



71 



72 



73 



74 



75 



76 



770 



77-5 



780 



78 5 



79-0 



795 



80 



80-5 



810 



81-5 



820 



82-5 



83-0 



83-5 



840 



84-5 



85-0 



85 5 



860 



86-5 



87-0 



87-5 



88-0 



88-5 



890 



89 5 

 900 



90 5 

 910 



Vapour-Pressure. 



1. 

 (B.) 



2. 



(Ols.) 



3. 



(E.) 





8-4 



9-6 





108 



110 





133 



146 





161 



177 





19-7 



21-2 





24-0 



25-6 





291 



310 





35-6 



37-2 





43-0 



44-6 





51-6 ' 



53-0 





610 



62-5 





7l-0 



73-5 



... 



85-0 



860 



... 



100-0 



1000 





117-5 



1160 



1384 



136 2 



1340 



158-7 



146-5 



145-1 



170 



158-0 



155-7 



181-4 



169-8 



1675 



193-5 



182-5 



1800 



206-6 



1959 



193-9 



220 



210-1 



208-1 



234 



224 8 



2228 



249-0 



241)- 1 



237-9 



264-8 



257-0 



253-7 



281-8 



274-0 



2700 



2995 



2921 



287-5 



319-2 



311-7 



305-3 



3386 



3320 



3233 



359-0 



353-5 



342-3 



380-5 



376-4 



362 



4018 



401-7 



382-9 



424 6 



427 



404-6 



4490 



4540 



427-4 



475 5 



482-0 



451-7 



503-0 



510-5 



477-0 



530-5 



5405 



5065 



5600 



571-6 



538-6 



590 



604-7 



5715 



621-5 



639-9 



608-8 



653-6 



676-6 



646-5 



687-5 



714-2 



685-0 



7255 



753-2 



7255 



761-5 



7940 



7660 



