1. Technology Interactions ‹ Chapter Title Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Technology Interactions Humans have always experimented with improving materials.

2. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Materials science is the study of the properties and applications of materials. Materials science is important in many engineering fields, including electronic, aerospace, mechanical, and structural engineering. What Is Materials Science?

3. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Matter Matter is anything that occupies space and has mass. Atoms are the building blocks of matter. Matter made from only one kind of atom is called an element.

4. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Matter Forms of matter ♦ Solids have definite size, shape, and volume. ♦ Liquids have definite volume but take the shape of their container. ♦ Gases have no shape or volume of their own.

5. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Material Properties A material property describes how a material reacts under certain conditions. Materials can have many kinds of properties.

6. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Ductility Ductility is the ability to be formed and reformed.

7. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Hardness Hardness is the ability to resist denting and scratching.

8. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Elasticity Elasticity is the ability to return to original shape after being pulled or pushed.

9. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Conductivity Conductivity is the ability to allow the flow of heat or electricity.

10. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Strength Strength is the ability to resist forces such as compression and tension.

11. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Classification of Materials Metals ♦ Ferrous (containing iron) ♦ Nonferrous (no iron) Ceramics (made from minerals) Polymers (chains of molecules) ♦ Natural ♦ Synthetic Composites

12. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Using Materials Science Materials scientists and engineers are constantly experimenting and improving materials. Diamonds are nature’s hardest material but are rare and expensive. Synthetic diamonds were engineered for use in many industrial applications. The emerging field of nanotechnology applies materials science at the molecular or atomic level.

13. Technology InteractionsChapter 4 Materials Science Copyright © Glencoe/McGraw-Hill A Division of The McGraw-Hill Companies, Inc. Managing Material Resources Most industrial materials come from the earth as natural resources. Natural resources are either renewable or nonrenewable. ♦ Renewable resources, such as trees, can be regrown or replaced. ♦ Nonrenewable resources, such as oil or coal, are limited and will eventually run out.