A thermodynamic equation of state for the critical region of argon

A new fundamental equation of state that describes the behavior of the thermodynamic properties of argon in the vicinity of the critical point is formulated. In this work, we present an equation of state based on the crossover model that takes into account not only the scaling laws at the critical point but also the classical behavior far away from the critical point. The new equation of state is constructed based on the new pressure data of Gilgen et al. from Bochum group. We give the comparison with different sets of thermodynamic-property data available, such as the pressure data, the specific heat data and the speed of sound data as well as a comparison with the accepted international equation for the thermodynamic properties of argon, developed by Stewart and Jacobsen. (C) 2012 Elsevier By. All rights reserved.