# Fluids Database | Top Previous Next

The fluids database contains comprehensive thermo physical data for over 850 fluids. Thermo physical properties (density, viscosity, thermal conductivity, specific heat, physical constants and critical values, heat of vaporization, vapor pressure, and surface tension) are stored so that FluidFlow can complete pressure loss calculations including heat transfer and phase change. The database is much more than a table of physical properties. Many "state of the art" physical property prediction methods are available, often used together with modern Equations of State such as Benedict Webb Rubin, Lee Kesler, and Peng Robinson. There are special relationships for water and steam (IAPWS), air, and you can also mix fluids (non-reacting) by using the database tools or dynamically in the flowsheet. An example of a pre-mixed fluid made by combining fundamental fluid components in the fluid database is natural gas. A typical definition, showing molar composition is illustrated below: Alternatively fluids can be mixed on the flowsheet. The following example shows the mixing of 4 alcohols. The scope of explaining the addition of a new fluid to the fluid properties database is a little outside the quick start guide. For detailed information on how to do this see the help file or user manual. In the database section we will explain a simpler addition in the next section.