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17.2 – Heating the atmosphere – Part I

17.2 – Heating the atmosphere – Part I. Do Now. What is the difference between heat and temperature?. Do Now. What is the difference between heat and temperature? Heat: Energy transferred from one object to another because of a difference in temperature.

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17.2 – Heating the atmosphere – Part I

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  1. 17.2 – Heating the atmosphere – Part I

  2. Do Now • What is the difference between heat and temperature?

  3. Do Now • What is the difference between heat and temperature? • Heat: Energy transferred from one object to another because of a difference in temperature. • Temperature: is a measure of the average kinetic energy of the individual atoms or molecules in a substance.

  4. Key Words • Heat • Mechanism • Molecule • Electromagnetic Spectrum • Emit • Absorb

  5. Vocab Words • Temperature • Conduction • Convection • Radiation

  6. Methods of Heat Transfer • Three mechanisms of energy transfer as heat are conduction, convection, and radiation. • All 3 happen at the same time in the atmosphere. • They transfer energy between Earth's surface (both land and water) and the atmosphere. • Conduction is the transfer of heat through matter by molecular activity. • Convection is the transfer of heat by mass movement or circulation within a substance. • Radiation is the transfer of energy (heat) through space by electromagnetic waves that travel out in all directions. • Unlike conduction and convection, which need material to travel through, radiant energy can travel through the vacuum of space.

  7. Laws Governing Radiation • 4 laws govern radiation and help us better understand how the atmosphere is heated. • All objects, at any temperature, emit radiant energy. • Hotter objects radiate more total energy per unit area than colder objects do. • The hottest radiating bodies produce the shortest wavelengths of maximum radiation. • Objects that are good absorbers of radiation are good emitters as well.

  8. Electromagnetic Waves • The sun emits light and heat as well as the ultraviolet rays that cause a suntan. These forms of energy are only part of a large array of energy emitted by the sun, called the electromagnetic spectrum. • Visible light is part of this spectrum, and the only part that we can see.

  9. Group Activity • Come up with an example, different from the book but similar to Figure 9 on page 483, and draw a picture with your description. • Follow the directions to the Molecule Model Activity and then write how this activity helped you better understand energy transfer as heat.

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