Phenyl trifluoromethyl sulfone (FS-13) is a polar diluent, proposed in literature as an alternate to nitrobenzene, in UNEX/HCCD-PEG
processes for better physical properties. Its PVT properties and accurate expression for estimation of its vapour pressure
are not available in the literature. Recently PVT properties of FS-13 were estimated by authors and its vapour pressure was
experimentally measured at temperatures ranging from 263.15 to 363.15 K. In this paper, results of these studies are presented.