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### Understanding Radiation: Infrared, Vacuum Flasks, and Heat Transfer ###

This content explores the concept of radiation, focusing on how infrared light travels and its role in heat transfer. Students will learn that radiation is the transfer of energy through waves, which can travel through a vacuum, unlike sound. Key learning outcomes include describing the speed of infrared light, the impact of different colors on heat absorption, and explaining the insulation of a vacuum flask. The properties of infrared radiation and its applications are discussed, including how colors affect heating and how vacuum flasks minimize heat loss. ###

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### Understanding Radiation: Infrared, Vacuum Flasks, and Heat Transfer ###

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  1. 7 June, 2014 Radiation Keywords EM-Spectrum, Speed of light, Infra-red, Leslie Cube, vacuum, reflect

  2. Learning Outcomes: All students should be able to: • Describe what radiation is. Most students should be able to: • Describe how fast infra-red light travels, and how different colours effect the rate how much heat is absorbed or radiated. Some students should be able to: Explain how a vacuum flask insulates so well.

  3. Radiation • Radiation is the transfer of energy by waves • Light is radiated, sound is radiated • Heat is radiated in infra-red waves and needs no medium in which to travel. (It can travel through a vacuum)

  4. Infrared • Infra Below

  5. Radiation of heat energy • Heat is being radiated to us all the time by the Sun. • It’s travelled 92 million miles to reach us (150 million km) • It takes about 8 minutes to get here!!

  6. More Radiation facts • It travels in all directions • In straight lines • Goes at the speed of light (Infrared is part of the electromagnetic spectrum) • Doesn’t need particles to transfer the energy – transferred by waves

  7. Don’t open the door!

  8. Residual heat

  9. Residual heat

  10. How do colours make a difference? • Is black a good absorber of heat radiation? • Are light colours and shiny surfaces good at absorbing heat radiation?

  11. Vacuum Flasks Parts 1 double-walled glass container 2 hot liquid 3 plastic cap 4 plastic support 5 plastic container 6 silvered surfaces 7 sponge pad 8 vacuum

  12. Vacuum Flask • Explain how the flask slow down: • 1 Conduction? • 2 Convection? • 3 Radiation? • The vacuum stopsconduction • The cap stops convection • The silver stops radiation

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