Equation of State and Critical Behavior of Simple Fluid Models

Abstract

The equation of state for fluids is considered starting with Van der Waals equation. Corrections from γ-ordering for long-range forces and its renormalization are dealt with and related to the mean spherical approximation (MSA) both for lattice gases and continuum fluids. The self-consistent Ornstein-Zernike approximation (SCOZA) is then considered and results so far for this approach are discussed. The results turn out to have good general accuracy. This also holds for the critical region which is discussed with respect to general properties, critical indices, and deviation from standard scaling.