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Middle School

Structure and Properties of Matter

Phase Changes

Lesson Description:

Water boils. Ice melts. Fog forms. Honey crystallizes. In each of these examples, a substance changes from one form to another. A phase is a distinct physical form of matter. An example is water in its solid (ice), liquid (water), and gas (vapor or steam) forms. In this lesson, you will investigate phase changes. You will observe changes in temperature as heat is added to a liquid or a solid.