From the developer: "GOWProp calculates gas, oil and water physical properties (PVT) based on user selected method. The program includes the gases: Natural Gas, Air and Nitrogen, and the liquids: Oil, Water, Methanol and Glycols (MEG, DEG and TEG). Gas properties include: Density, Compressibility, Z-factor, Viscosity, Isentropic coefficient, etc. Liquid properties include: Density, Compressibility, Bubble point pressure (oil), Viscosity, Solution Gas-Liquid ratio (oil and water), Specific heat, etc."