Abstract
A pictorial representation of solid-gas equilibria is useful for studying the thermodynamics of a system under consideration. These diagrams show the stability regions of the species involved in a system as functions of pressures of two reacting gases. A computer program initially developed to plot the predominance area diagrams for metal-sulfur-oxygen (M-S-O) systems in roasting processes has been modified and generalized to handle any solid-gas system. This program has been utilized to plot the predominance area diagrams (PAD) for metal-sulfur-oxygen and metal-oxygen systems. The only data input required by the computer are the standard free energy values of all species existing in a system.
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