immiscibele

Immiscibele is a term that appears in a minority of texts to describe the property of immiscibility, or the lack of mutual solubility, between two liquids. It is not a standard entry in most chemistry glossaries; the preferred terms in mainstream literature are immiscible (adjective) and immiscibility (noun). When used, immiscibele refers to systems in which the liquids do not form a single homogeneous phase upon contact and instead separate into two distinct liquid layers with a defined interface.

In immiscibele liquid pairs, the driving force is typically a large positive Gibbs free energy of mixing, leading to phase separation. The degree of separation is influenced by temperature, pressure, and the chemical nature of the liquids, and is often illustrated by a two-phase region in a phase diagram. Completely immiscible pairs have negligible solubility of each liquid in the other at the conditions of interest, while systems described as partially immiscible exhibit limited mutual solubility and may show coexisting solubility limits at equilibrium.

Common examples cited in introductory texts include oil and water, which form a clear oil-rich and a water-rich phase, and certain chlorinated solvents with polar liquids. In practice, immiscibele systems are exploited in techniques such as liquid–liquid extraction, where a denser or immiscible solvent selectively partitions compounds from one phase to another.

See also: immiscible and immiscibility, miscibility, phase separation, interfacial tension, liquid–liquid extraction, emulsions.