![]() ![]() The composition variable usually varies along the horizontal axis and can be the mole fraction, mass fraction, or mass percent of one of the components, as will presently be illustrated by various examples. The position of the system point on one of these diagrams then corresponds to a definite temperature, pressure, and overall composition. Instead of using these variables as the coordinates of a three-dimensional phase diagram, we usually draw a two-dimensional phase diagram that is either a temperature–composition diagram at a fixed pressure or a pressure–composition diagram at a fixed temperature. We can independently vary the temperature, pressure, and composition of the system as a whole. Since \(F\) cannot be negative, the equilibrium system can have no more than four phases. There must be at least one phase, so the maximum possible value of \(F\) is 3. 13.3 will describe some interesting ternary systems.Ī binary system has two components \(C\) equals \(2\), and the number of degrees of freedom is \(F=4-P\). This section discusses some common kinds of binary systems, and Sec. 8.2, a phase diagram is a kind of two-dimensional map that shows which phase or phases are stable under a given set of conditions. ![]()
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