Figure 4

Weighing data and sorption data for several representative mixtures. Panels on the left side of figure plot the balance readings for the two sinkers versus the pressure of the fluid sample; ⚪, sorption sinker;  ×, density sinker; and panels on the right side plot the values of Δm _sorption versus the pressure for the corresponding mixtures; ◇, Region I; +, Region II; ◽, Region III. The mixtures are (a₁ and b₁): 0.75 CH₄ + 0.25 C₃H₈; (a₂ and b₂): 0.50 CH₄ + 0.50 C₃H₈; (a₃ and b₃): 0.75 CO₂ + 0.25 Ar; (a₄ and b₄): 0.50 CO₂ + 0.50 Ar; the temperature was 273.15 K for all tests shown. Regions I, II, and III are defined in the section Isothermal Measurements.