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The term phase transition (or phase change) is most commonly used to describe transitions between solid, liquid, and gaseous states of matter, as well as plasma in rare cases. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change, often discontinuously, as a result of the change of external conditions, such as temperature, pressure, or others. For example, a liquid may become gas upon heating to the boiling point, resulting in an abrupt change in volume. The measurement of the external conditions at which the transformation occurs is termed the phase transition. Phase transitions commonly occur in nature and are used today in many technologies.

The term phase transition (or phase change) is most commonly used to describe transitions between solid, liquid, and gaseous states of matter, as well as plasma in rare cases. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change, often discontinuously, as a result of the change of external conditions, such as temperature, pressure, or others. For example, a liquid may become gas upon heating to the boiling point, resulting in an abrupt change in volume. The measurement of the external conditions at which the transformation occurs is termed the phase transition. Phase transitions commonly occur in nature and are used today in many technologies.

'''<font color="#ff8000"> 相变Phase transition (or phase change)</font>'''一词常用于描述物质固态，液态和气态之间的转变，在极少数情况下还涉及到等离子体。热力学系统的相和物质的状态一样，均具有统一的物理特性。由于外部条件（例如温度，压力或其他）的变化，在给定介质的相变过程中，它的某些属性通常发生不连续地变化。例如，液体在加热到沸点的时候可能会变成气体，导致体积大小突然改变。'''<font color="#32CD32">当这种转变发生时，外部条件的度量称为相变</font>'''。相变通常发生在自然界，不过如今越来越多地被用于科技行业。

'''<font color="#ff8000"> 相变Phase transition (or phase change)</font>'''一词常用于描述物质固态，液态和气态之间的转变，在极少数情况下还涉及到等离子体。热力学系统的相和物质的状态一样，均具有统一的物理特性。由于外部条件（例如温度，压力或其他）的变化，在给定介质的相变过程中，它的某些属性通常会发生不连续地变化。例如，液体在加热到沸点的时候可能会变成气体，导致体积大小突然改变。'''<font color="#32CD32">当这种转变发生时，外部条件的度量称为相变</font>'''。相变通常发生在自然界，不过如今越来越多地被用于科技行业。