No abstract

Experime ntal PVT data for liquid methan e are reported at densiti es from 1.8 tim es criti cal up to the freezing Liquid , at tem perature s from 91 to 245 K a nd press ures to 350 bar. A nonanalytic equation of state is adjusted to these and other PVT data from id eal gas states to th e free zin g liquid , at tempe ratures from the tripl e poin t to 400 K.

Exp e rim ental PVT mea s urem e nts on gaseo u s and liquid Auorine from the trip le point (53 .5 K) to 300 K at press ures to about 21 MN/m2 are presented. Th e data are represente d by a trun ca ted viria l e quation in th e low-density region. Comparisons of th e seco nd virial coefficient from this equa ti on are made with publis hed data_ The PVT re lationship a long th e loui e-Tho mson inversion c urve was ob ta in ed from th e isothe rm -isoc hore re prese ntation of the high de nsity region.Key words: I soc hores; isoth e rm s; Joul e-Thom so n inv e rs ion c urve; liquid den sities a long melti ng line; PYT data; seco nd viriai coe ffi c ient; third viriai coefficient.

Experime ntal s pecific heats of flu orin e at constant total volum e are reported for th e two·phase, liquid·vapor sys tem from triple· to the critical po int. Specific heats of liquid along th e coex istence path are derived by use of PVT data for th e two·phase sys tem , and are re presented by a formul a to faclhtate computations of th ermodynami c properties.

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.