890 



VI. Tx- and px-diagrams. 



The data found above enable us to derive teinperature-connposition 

 as well as pressure-composition diagrams. The values which we 

 obtained are arranged in Table 10 on page 891; hy means of tiiese 

 a few 7'tvcurves were drawn (fig. 5) and the p,r-diagram for 

 7'=85°.1J (fig. 6)'). 



r/gs. 



rig.6. 



It will be seen, that the diii'erence in composition between the 

 liquid- and vapour-phases is a little smaller on the nitrogen- than 

 on the argon-side. A glance at the tigure further shows, that in the 

 preparation by means of fractionation of argon from mixtures 

 containing only a few hundredths of argon no great advantage can 

 be gained from raising the pressure, although the advantages of a 

 better exchange of cold at the higher pressures must not be lost 

 sight of, whei-e a technical method is concerned. 



The change of the composition of the gas-phase with that of the 

 liquid-phase satisfies the relation ^) : 



1) The Tx curves for p = 50 have been doited on the argonside, as the solid 

 makes its appearance here. 

 '2j Lehfeldt, Phil. Mag. (5) 40 397 (1S95). 



