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Phases

Definition

A phase is a region of space where all the material properties are the same.

Examples

- Water in a glass is formed by one phase. The water with the glass is formed of two phases: a liquid phase and the solid phase. - A clear broth is composed of two liquid phases: the fat lenses supernatant and the broth itself.

Definition

A sample of material is - homogeneous, if it is formed of one phase - heterogeneous, if it it consists of several phases.

Examples

Clean air is homogeneous. Smoke is heterogeneous, since it consists of solid particles and air.

Milk microscopically: A heterogeneous mixture consisting of two phases