Coexistence curve of the binary fluid nitrobenzene–heptane

Abstract

The liquid–liquid coexistence curve of the binary fluid nitrobenzene–heptane has been measured by interferometric means. The mole fraction concentration difference, ΔX, between the two liquid phases is equal to (0.205 ± 0.010)[(Tc − T)/Tc]β with β = 0.3328 ± 0.0020. The critical concentration is 0.470 ± 0.003 mole fraction nitrobenzene.