Understanding Heat Transfer in Matter

1. Sponge • Arrange the three states of matter from that which has the fastest moving atoms to that which has the slowest moving atoms.

2. Three Ways to Heat MatterI can define conduction, convection, and radiation.I can summarize the main idea of today’s lesson and suggest examples that illustrate each concept.

3. Conduction • The flow of energy from one object to another by direct contact between the objects. • It occurs when faster-moving particles in the warmer object strike the slower-moving particles near them in a cooler object. • What does the saying, “It’s so hot out, you could fry an egg on the sidewalk!” mean? • Do you think this would be possible? • Remembering • Activity: Ice cube in hand • Would you want your home heated by conduction? Why or why not? • Examples of conduction.

4. Conductors and Insulators • Conductors: Substances through which energy flows easily. • Examples: Most metals • Insulators: Substances though which energy does not flow easily. • Examples: Fur, wood, plastic • Activity: Comparing insulators and conductors • Think of a conductor and an insulator you have used.

5. Convection • Liquids & gases • When matter is heated, it expands. In a liquid or gas, this expanded matter is less dense than cooler matter, so it rises, carrying its energy with it. Denser, cooler matter sinks. • This creates a circular current. • Remembering • Demonstration • Examples • Why can’t convection take place in solids?

6. Radiation • The transfer of heat from one place to another without the use of matter. • Radiant energy happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth.  In fact, all hot things radiate heat to cooler things. When the heat waves hits the cooler thing, they make the molecules of the cooler object speed up.  When the molecules of that object speed up, the object becomes hotter.  • Examples

7. Get it, Got it, Good!!! • You will complete a computer activity where your knowledge of the three ways matter can be heated will be key. Get a computer, go to my wiki, click on “Surveys”, click on the link under the title “Three Ways to Heat Matter”, and complete the activity by following the directions on the site. • When you have completed the computer activity. You are going to compose a poem about the three ways to heat matter. Start each stanza with one way to heat matter. Include information about how heat is getting to and passing from particle to particle. Use the information you took for notes!! Use examples to show what you are talking about. You must have four stanzas (an introduction and one for each way to heat matter) and include at least four sentences in each stanza.