Liquid-phase meaning

When a variable quantity is at a minimum a slight change in the system does not affect its value, and therefore, when a solution is saturated, the increase in the available energy of the liquid phase produced by dissolving in it some of the solid must be equal to the decrease in the available energy of the solid phase, caused by the abstraction from the bulk of that part dissolved.

It is usual to call each part of the system of uniform composition throughout a phase; in the example given, water substance, the only component is present in two phases - a liquid phase and a vapour phase, and when the potentials of the component are the same in each phase equilibrium exists.

At the cryohydric point 0 we have four phases in equilibrium at a definite pressure, temperature and composition of the liquid phase.

At C a new o° A C liquid phase appears - the B solution of water in liquid ' r q Ivater 50 Phenol phenol, the solubility of which FIG.

At D the composition of the two liquids becomes identical, and at temperatures above D, 68°C the liquids are soluble in each other in all proportions, and only one liquid phase can exist.