1. Unit 3 Lesson 4 What Are the States of Matter? Copyright © Houghton Mifflin Harcourt Publishing Company

2. Unit 3 Lesson 4 What Are the States of Matter? Florida Benchmark Copyright © Houghton Mifflin Harcourt Publishing Company SC.3.P.9.1 Describe the changes water undergoes when it changes state through heating and cooling by using familiar scientific terms such as melting, freezing, boiling, evaporation, and condensation.

3. Unit 3 Lesson 4 What Are the States of Matter? What’s the State? Copyright © Houghton Mifflin Harcourt Publishing Company There are three common states of matter: solid, liquid, and gas. A solid is matter that takes up a definite amount of space. Solids also have a definite shape. Ice is a solid.

4. Unit 3 Lesson 4 What Are the States of Matter? What’s the State? Copyright © Houghton Mifflin Harcourt Publishing Company A liquid is matter that takes up a definite amount of space but does not have a definite shape. Liquids take the shape of their containers. Drinking water is a liquid.

5. Unit 3 Lesson 4 What Are the States of Matter? What’s the State? Copyright © Houghton Mifflin Harcourt Publishing Company A gas is matter that does not take up a definite amount of space and does not have a definite shape. The air around you is a gas.

6. Unit 3 Lesson 4 What Are the States of Matter? Cool! It’s Freezing! Copyright © Houghton Mifflin Harcourt Publishing Company When water cools, it loses energy. When it is cooled enough, it freezes. Freezing is the change of state from liquid to solid.

7. Unit 3 Lesson 4 What Are the States of Matter? Cool! It’s Freezing! Copyright © Houghton Mifflin Harcourt Publishing Company Below the freezing temperature, water is a solid. Hail, ice on a lake, and a snowball are examples of solids. Each of these examples is water frozen into a solid.

8. Unit 3 Lesson 4 What Are the States of Matter? Just Add Heat! Copyright © Houghton Mifflin Harcourt Publishing Company When water is heated, it gains energy. If ice is heated enough, it melts. Melting is the change of state from a solid to a liquid. It is the opposite of freezing. Water freezes and melts at 0 °C (32 °F).

9. Unit 3 Lesson 4 What Are the States of Matter? Just Add Heat! Copyright © Houghton Mifflin Harcourt Publishing Company If enough energy is added to water, it boils and changes to a gas. Water boils at 100 °C (212 °F). Water in the form of gas in called water vapor. Water vapor is invisible.

10. Unit 3 Lesson 4 What Are the States of Matter? Now You See It … Copyright © Houghton Mifflin Harcourt Publishing Company Liquid water can change to a gas without boiling in a process called evaporation. Water evaporates from puddles on a warm day.

11. Unit 3 Lesson 4 What Are the States of Matter? Now You See It … Copyright © Houghton Mifflin Harcourt Publishing Company What happened to the water?

12. Unit 3 Lesson 4 What Are the States of Matter? Now You See It … Copyright © Houghton Mifflin Harcourt Publishing Company A gas can change back to a liquid in a process called condensation. When water vapor loses energy, such as on a cold window pane, it changes to a liquid.