The term phase is sometimes used as a synonym for state of matter, but there can be several immiscible phases of the same state of matter (as where oil and water separate into distinct phases, both in the liquid state). : 86 : 3 Examples of physical properties include density, index of refraction, magnetization and chemical composition. More precisely, a phase is a region of space (a thermodynamic system), throughout which all physical properties of a material are essentially uniform. The glass of the jar is another separate phase. 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. In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable.
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