(211f) Estimation of the Isothermal Compressibility and the Thermal Expansion Coefficient Using Density Explicit Empirical Equations

The isothermal compressibility and thermal expansion coefficient for diverse substances were estimated using explicit volume empirical equations. Even though most empirical equations can represent densities appropriately [1,2], their use to calculate 2nd order thermodynamic properties has not been studied deeply. In this work, Tait-type equations and short explicit volume equations were tested to know their capabilities to estimate the isothermal compressibility and thermal expansion coefficient. The empirical equations were used to solve the density derivatives respect to pressure and respect to temperature in order to obtain isothermal compressibility and thermal expansion coefficient. Estimated values using the empirical equations were compared with values obtaining using the pρT raw data.