3. The pure body in several phases

3.1 Phase equilibria of a pure body

When a pure body can exist in ϕ phases, its representation model is a closed system with adjacent open subsystems, capable of exchanging matter and energy flows between them.

The total extensive quantities of the system are equal to the sum of the corresponding quantities of the adjacent ϕ subsystems: ${\begin{cases} bilan de matière : n_{1} + n_{2} + \dots + n_{φ} = n = costante \end{cases}$

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The pure body in several phases

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Liquid/vapour equilibrium of a pure body

In Engineering Techniques

(1) - SCHUFFENECKER (L.), JAUBERT (J.-N.), SOLIMANDO (R.) - Formalisme et principe de la thermodynamique - . . Traité Sciences fondamentales (1999).
(2) - SCHUFFENECKER (L.), DELLACHERIE (J.) - Températures et enthalpies de fusion et...