In other words, a phase is a structurally homogeneous portion of matter. it is a physically distinct from other phases, chemically homogeneous and mechanically separable portion of a system.
A phase can be defined as a homogeneous portion of a system that has uniform physical and chemical characteristics i.e. It is possible to have a mixture of two different solutions! A pure substance, under equilibrium conditions, may exist as either of a phase namely vapor, liquid or solid, depending upon the conditions of temperature and pressure. In mixtures, there are different phases, each with its own atomic arrangement. Solute does not change the structural pattern of the solvent, and the composition of any solution can be varied. A solution (liquid or solid) is phase with more than one component a mixture is a material with more than one phase. Different components can be combined into a single material by means of solutions or mixtures. The mixture of two or more phases may permit interaction between different phases, and results in properties usually are different from the properties of individual phases. Many of the engineering materials possess mixtures of phases, e.g.
