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Unformatted text preview: 0 100% O2 100 90 80 70 60 50 40 30 20 10 0% N2 FIGURE 1621 Equilibrium diagram for the two-phase mixture of oxygen and nitrogen at 0.1 MPa. We could also derive these relations by using mathematical vigor instead of physical arguments. Some components may exist in more than one solid phase at the specified temperature and pressure. In this case, the specific Gibbs function of each solid phase of a component must also be the same for phase equilibrium. In this section we examine the phase equilibrium of two-component systems that involve two phases (liquid and vapor) in equilibrium. For such systems, C 2, PH 2, and thus IV 2. That is, a two-component, twophase system has two independent variables, and such a system will not be in equilibrium unless two independent intensive properties are fixed. In general, the two phases of a two-component system do not have the same composition in each phase. That is, the mole fraction of a component is different in different phases. This is illustrated in Fig. 1621 for the twophase mixture of oxygen and nitrogen at a p...
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- Summer '08