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E-STAR - Student

Home Physics PHYSICS: A Textbook for Grade 10   Chapter 6: Properties of Matter

E-Lecture - Changes in state of matter

A phase change occurs when a substance changes state. For example, when ice (solid) converts to water (liquid), which then turns to vapor as the temperature increases. The decrease in temperature changes the phase from gas to liquid and then to solid. A change of state undertakes when the average kinetic energy of the molecules (or temperature) in the substance changes.

Key Terms

Phase (of matter) point at which all the physical properties within a material are uniform

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