High temperature melts, fluids and gases progressively organize themselves structurally during cooling, usually causing separation of solids, liquids or gases. In many different chemical systems this phase separation results in distinct chemical separation (immiscibility), with associated contrasting physical properties in the separating phases. Because of the variety in chemistries, and relative changes in entropy and volumes of the natural mixtures compared to the separated phases, immiscibility can occur in different chemistries during heating and compression, as well as during cooling and decompression.

Although the main emphasis in this volume is on fluid–fluid equilibria, there are good examples and...

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