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Convection and Radiation Chapter 12 Heat Lesson 2 continued My room! Convection: Going with the flow • A convection current is a pattern of . Radiator • What is a fluid? • In a room heated by a radiator, where is the warmest air located? Where is the coldest air located? • How do convection currents affect weather? • Why is the 8th floor of my dorm hotter than the bottom floors? How do convection currents affect weather? The wind we feel outside is often the result of convection currents. You can understand this by the winds you feel near an ocean. Warm air is lighter than cold air and so it rises. During the daytime, cool air over water moves to replace the air rising up as the land warms the air over it. Think: Convection Winds Cause Effect Why is the 8th floor hotter than the bottom floors? Whew! It’s hot up here! It feels nice down here! GOING WITH THE FLOW Convection is all about flow. It needs something flowing to carry heat – fluids – liquids or gases. Because of convection currents, all the water in a tea kettle gets heated, not just the water at the bottom closest to the stove. Remember: Heat RISES!!! WHY? Think density Radiation: Riding the Waves • Radiation is that is sent out in . • How is radiation different from conduction and convection? • Use radiation to explain how a greenhouse might work. (Hint: pg. 358 in textbook) • Why do you feel cooler the farther away you move from a fire? Greenhouse The sun’s RAYS RADIATE to Earth! It’s cold over here! Can I come closer to the fire? No! You’re weird! Ahhh…. that sun feels nice! Putting it all together • Give an example of how conduction, convection, and radiation work together. Putting it all together • Take out your Venn Diagrams from yesterday (where we compared conductors and insulators). • Turn to the back. • Work with a partner to fill in the blanks in the diagrams: (there are 2) – Conduction – think TOUCH – Convection – think FLOW – Radiation – think FEEL CONDUCTION (TOUCH) CONVECTION (FLOW TO TOP) RADIATION (FEEL) CONVECTION (FLOW) CONDUCTION (TOUCH) RADIATION (FEEL) Exit Ticket • Why does a car or person get hot sitting out in the sun?