Properties of Fluorine along the Vapor–Liquid Coexistence Boundary

Abstract

Saturated liquid and vapor densities from the triple point to the critical points are reported. These data were derived from experimental PVT isochores and an accurate vapor pressure equation. The critical point parameters were estimated by fitting an equation to all experimental data within 20% of the critical temperature. Separate equations, each constrained to the new critical point parameters, were fitted to the saturated liquid and vapor densities. Latent heats of vaporization were calculated from the Clapeyron equation and compared to other published values. A vapor pressure equation based on the IPTS 1968 temperature scale is reported.

PVT measurements, virial coefficients, and Joule-Thomson inversion curve of fluorine

“…From 4 to 7 coefficie nts were needed to represent all of the remaining isotherms. The isotherms in the compressed liquid and vapor phases below the critical temperature were constrain ed to the corresponding saturation density from reference [2] (see also Appendix). Above 138 K th e isotherms wer e also fitted to the low density data in the virial region to provide a better match of th e surfaces around the 6.0 molll isochore.…”

Thermophysical properties of methane: Virial coefficients, vapor and melting pressures

“…Selected data for the second virial coefficient at te mperatures down to th e normal boiling point are of good quality, but few if any consistent data exist for lower temperatures. Furthe r results for th e third virial coefficient are need ed at low temperatures_ For the vapor pressures, the rms deviation of 0.3 percent found here could be reduced one order of magnitude through self-consistent measurements of high accuracy [17]. New determinations of the melting pressures to about 300 atm clearly are needed_ Available analytical expressions are capable of representing all of the properties we have examined within the precision of the measurements.…”

“…and the new equation is (4) Exponent e has been established at this laboratory through examination of more precise data on other substances: e= 1.433 for fluorin e [17] and e= 1.45± 0.05 for oxygen (Rolf Prydz); and e = 1.45 for nitrogen [27].…”

The thermodynamic properties of compressed gaseous and liquid fluorine

“…. (22) Since the temperature, T, of the water bath is constant and the number of moles, n, also remain the same, T.…”

“…Hence, division of Equation (22) by Equation (21) yields (23) i-i These equations applied to this steel bomb, relate the change of either volume from before to after the expansion as AV/V = 2. 10 x 10" 5 (P.…”