Measurement and correlation of the (p, ρ,T) relation of ethylene I. The homogeneous gaseous and liquid regions in the temperature range from 105 K to 340 K at pressures up to 12 MPa

(p, Vm, T) measurements on liquid and gaseous mixtures near the critical point. II. (xenon + ethene)

“…(7) A good agreement between the literature values and our result was found. The critical density of pure ethene obtained in this work ρ c = 7.615 mol · dm −3 , deviates approximately by 0.25 per cent from the critical density published by IUPAC, (4) ρ c = 7.634 mol · dm −3 , and by 0.3 per cent from the value reported by Nowak et al, (8) ρ c = 7.637 mol · dm −3 .…”

Supplementary measurements of the (p,ρ,T) relation of carbon dioxide in the homogeneous region atT=313 K and on the coexistence curve atT=304 K

“…The design of this densimeter was described in detail in previous papers (2,3) and a brief description is given in our most recent paper. (4) Up to now, comprehensive measurements on methane, (2,3,5,6) carbon dioxide, (7)(8)(9) argon, (10,11) ethylene, (12,13) and nitrogen (4,14) have been carried out successfully with this densimeter.…”

Measurement and correlation of the (p,ρ,T) relation of nitrogen. I. The homogeneous gas and liquid regions in the temperature range from 66 K to 340 K at pressures up to 12 MPa

“…This densimeter was developed in order to obtain accurate (p, r, T ) measurements of pure fluids in the homogeneous gas and liquid phase including the critical region and, in particular, the entire (vapour + liquid) coexistence curve. Up to now, comprehensive measurements on methane, (3)(4)(5)(6) carbon dioxide, (7)(8)(9) argon, (10,11) and ethylene (12,13) have been carried out successfully; nitrogen, (14) sulphur hexafluoride, (15) and the refrigerants R12 and R22 (16) have been measured in parts of the fluid region. The design of the densimeter was described in detail in previous papers; (3,6) therefore only the measuring principle is briefly explained here.…”