Phase (matter)

In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air is a third phase over the ice and water. The glass of the jar is a different material, in its own separate phase.

Extends: [Engineering thermodynamics](https://wikipedia.org.ai/Engineering thermodynamics), [Condensed matter physics](https://wikipedia.org.ai/Condensed matter physics), [Concepts in physics](https://wikipedia.org.ai/Concepts in physics), [Phases of matter](https://wikipedia.org.ai/Phases of matter)