Many of the thermophysical properties of fluids are greatly altered at high pressures, and the study of the effects of temperature and pressure on these properties is of much scientific and technological importance. The definition, classification and character of thermophysical properties are discussed, as well as the philosophy in their researches. The general behavior of the typical properties with temperature, pressure and density is summarized in both gaseous and liquid phases. Some anomalous phenomena are also reviewed briefly. The present status of the database systems is referred for the practical use of the thermophysical property information.
