Final answer:
Fugacity is the corrected pressure in thermodynamic models accounting for non-ideal behavior of gases, particularly relevant at high pressures.
Step-by-step explanation:
Fugacity is indeed the corrected pressure used in thermodynamical models to account for non-ideal gas behavior. In thermodynamic equations such as the one relating Gibbs free energy change (ΔG) to the equilibrium constant (K), fugacity replaces the idealized pressure to give an accurate representation of a system, especially at high pressures where the gases do not follow the ideal gas law.
The introduction of fugacity into calculations allows for the consideration of the real interactions occurring between gas molecules, such as intermolecular forces and the actual volume occupied by the molecules. Fugacity is commonly used when gas pressures are sufficiently high that the deviations from ideal gas behavior become significant.