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# ZingPath: Phase Changes

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## Phase Changes

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### Lesson Focus

#### Boiling, Condensation, Freezing, and Melting Points

Physical Science

You will get to learn all about the various phase changes, from liquid to gas, solid to liquid, and many others. Turn up the heat and experiment with melting and boiling points, or keep things cool while learning how to alter the freezing point of liquids.

### Now You Know

After completing this tutorial, you will be able to complete the following:

• Identify the boiling, freezing, cendensation, and melting points of water on the Celsius scale.
• Define the boiling temperature of a substance.
• Define the freezing temperature of a substance.
• Understand that the boiling and freezing temperature of a substance is one of its characteristic properties.

### Everything You'll Have Covered

What is a phase change?

~ A phase change occurs when a substance changes from one state to another at a definite and specific temperature.

What are the melting and freezing points of a substance, and how are they related?

~ The melting point of a substance is the temperature at which it changes from a solid to a liquid. The freezing point of a substance is the temperature at which it changes from a liquid to a solid. The melting and freezing points of a substance are always equal.

What are the boiling and condensation points of a substance, and how are they related?

~ The boiling point of a substance is the temperature at which it changes from a liquid to a gas. The condensation point of a substance is the temperature at which it changes from a gas to a liquid. The boiling and condensation points of a substance are always equal.

How are the melting, freezing, boiling, and condensation points of a substance used for classification purposes?

~ Since a pure substance's melting, freezing, boiling, and condensation points are unique, these properties, like many others, can be used to distinguish between different substances.

### Tutorial Details

 Approximate Time 2 Minutes Pre-requisite Concepts Students should be able to define the following terms: boiling, boiling point, and condensation. Course Physical Science Type of Tutorial Animation Key Vocabulary boiling, boiling point, condensation