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 … See more

For a given composition, only certain phases are possible at a given temperature and pressure. The number and type of phases … See more

A single material may have several distinct solid states capable of forming separate phases. Water is a well-known example of such a material. … See more

Distinct phases may be described as different states of matter such as gas, liquid, solid, plasma or Bose–Einstein condensate. … See more

Left to equilibration, many compositions will form a uniform single phase, but depending on the temperature and pressure even a single substance may separate into two or more distinct phases. Within each phase, the properties are uniform but … See more

Between two phases in equilibrium there is a narrow region where the properties are not that of either phase. Although this region may be very … See more

When a substance undergoes a phase transition (changes from one state of matter to another) it usually either takes up or releases energy. For example, when water evaporates, … See more