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**Unit 1 Lesson 1 Introduction to Matter**

Copyright © Houghton Mifflin Harcourt Publishing Company

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**What’s the Matter? What is matter?**

Unit 1 Lesson 1 Introduction to Matter What’s the Matter? What is matter? Matter is anything that has mass and takes up space. Your body is matter, but light and sound are not matter. Copyright © Houghton Mifflin Harcourt Publishing Company

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**What is mass? Mass describes the amount of matter in an object.**

Unit 1 Lesson 1 Introduction to Matter What is mass? Mass describes the amount of matter in an object. A gram (g) is a common unit of mass. Objects of the same size can be made up of different amounts of matter. Copyright © Houghton Mifflin Harcourt Publishing Company

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**How does mass differ from weight?**

Unit 1 Lesson 1 Introduction to Matter How does mass differ from weight? Weight is a measure of the gravitational force on an object. The greater the mass of an object, the greater the gravitational force on the object and the greater the weight will be. Mass stays the same for an object even when increased or decreased gravitational forces change the weight of the object. Copyright © Houghton Mifflin Harcourt Publishing Company

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**Unit 1 Lesson 1 Introduction to Matter**

Measuring Space How is the amount of space occupied by matter measured? Volume is the amount of space that an object takes up, or occupies. A balloon and a bowling ball of the same size have the same volume but very different masses. Copyright © Houghton Mifflin Harcourt Publishing Company

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**How can volume be determined?**

Unit 1 Lesson 1 Introduction to Matter How can volume be determined? An object’s volume can be determined by a formula if the object has a well-defined shape. For rectangular solids, volume equals the object’s length times width times height, or V = lwh. To calculate volume, all measurements must be in the same units. Copyright © Houghton Mifflin Harcourt Publishing Company

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**How can volume be determined?**

Unit 1 Lesson 1 Introduction to Matter How can volume be determined? Liquid volume is measured with a beaker or graduated cylinder in liters (L) or milliliters (mL). 1 mL = 1 cm3 Displacement of water in a graduated cylinder can be used to find the volume of irregular-shaped solid objects. Copyright © Houghton Mifflin Harcourt Publishing Company

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**How can volume be determined?**

Unit 1 Lesson 1 Introduction to Matter How can volume be determined? How many milliliters of fluid does this object displace? Copyright © Houghton Mifflin Harcourt Publishing Company

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**Packing It In! What is density?**

Unit 1 Lesson 1 Introduction to Matter Packing It In! What is density? Density is a measure of the amount of matter in a given volume. The density of a substance remains the same no matter how much of the substance you have. Copyright © Houghton Mifflin Harcourt Publishing Company

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**How is density determined?**

Unit 1 Lesson 1 Introduction to Matter How is density determined? Density is mass divided by volume, or D = m/V. Common units for expressing density are grams per cubic centimeter, or g/cm3. Water has a density of 1 g/mL. Thus, objects with density greater than 1 g/mL sink in water. Objects with density less than 1 g/mL float in water. Copyright © Houghton Mifflin Harcourt Publishing Company

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**A solid has a definite shape**

A solid has a definite shape. It does not take the shape of its container. It also has a definite volume because it can be measured.

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**A liquid does not have a definite shape**

A liquid does not have a definite shape. It takes the shape of its container. It does have a definite volume because it can be measured.

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**A gas does not have a definite shape**

A gas does not have a definite shape. It sometimes takes the shape of its container and sometimes flies freely around you. These particles are not connected to each other and takes up whatever space is available.

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