This PhD Thesis is devoted to the study of several thermophysical properties, over broad
ranges of temperature and pressure, of mineral and semisynthetic reference lubricants, vegetable
oils and developed biodegradable lubricants, as well as ionic liquids (ILs) for their use as
hydraulic fluids, gear and two stroke lubricants.
The first property studied was the density from 278.15 K to 398.15 K up to 120 MPa.
Density was measured by means of two different vibrating tube densimeters from Anton Paar
(Graz, Austria). Results for eight reference oils, two vegetable base oils and eleven
biodegradable lubricants for different applications are provided. Moreover density data for seven
ILs are provided. Density data of all the studied fluids were correlated by means of the
Tammann-Tait equation and the isothermal compressibility, κT, and the coefficient of thermal
expansivity, αT, were obtained