A simple and sensitive densitometer for critical liquid mixtures

Abstract

A sealed volumeter for the study of liquid mixtures near their solution critical point is described. The cell used allows optical investigations to be performed at the same time. Although the method is very simple, high accuracy can be obtained (dρ/ρ=3×10 −6 relative and 4×10 −5 absolute) in a wide temperature range On decrit un pycnometre scelle pour l'etude des melanges de liquides pres de leur point critique de miscibilite complete. La cellule utilisee permet d'effectuer aussi des mesures optiques. Quoique la methode reste tres simple, une grande precision peut etre atteinte (dρ/ρ=3×10 −6 en relatif et 4×10 −5 en absolu) sur une grande gamme de temperature