Sect 18.2

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Sect 18.2

  1. 1. 6 th Grade Science Chapter 18 Thermal Energy Notes Section 18.2 Chihuly at the New York Botanical Garden
  2. 2. <ul><li>What is heat? </li></ul><ul><li>Heat is the transfer of thermal energy due to a temperature difference between two objects. </li></ul><ul><li>How does heat move? </li></ul><ul><li>Heat always moves from a object with a higher temperature to an object with a lower temperature. </li></ul>Key Questions 1
  3. 3. Heat is the transfer of thermal energy due to a temperature difference between two objects.
  4. 4. Heat Transfers from the boiling water to the ice water.
  5. 5. <ul><li>What is conduction? </li></ul><ul><li>Conduction is the transfer of thermal energy when substances are in direct contact. </li></ul><ul><li>What is radiation? </li></ul><ul><li>Radiation is the transfer of thermal energy by electromagnetic waves. </li></ul>Key Questions 2 The Tadpole Galaxy
  6. 6. <ul><li>Heat flows from your warmer hand to the colder ice, and the slow-moving molecules in the ice move faster. </li></ul>Conduction <ul><li>As a result, the ice becomes warmer and melts. </li></ul>
  7. 7. Conduction is the transfer of thermal energy when substances are in direct contact.
  8. 8. <ul><li>Heat is transferred from the Sun to Earth by radiation. </li></ul>Radiation <ul><li>Heat transfer by radiation occurs when energy is transferred by electromagnetic waves. </li></ul><ul><li>The transfer of thermal energy by radiation can occur in empty space, as well as in solids, liquids, and gases. </li></ul>
  9. 10. <ul><li>What is convection? </li></ul><ul><li>Convection is the transfer of thermal energy by the movement of matter. </li></ul><ul><li>What is a thermal conductor? </li></ul><ul><li>A thermal conductor is a material in which heat moves easily – metals. </li></ul>Key Questions 3 The Sombrero Galaxy
  10. 13. Thermal Conductors – Cookware, Copper Plumbing, Steel
  11. 14. <ul><li>What is a thermal insulator? </li></ul><ul><li>A thermal insulator is a material in which heat is NOT easily transferred. </li></ul><ul><li>What is the specific heat of a substance? </li></ul><ul><li>The specific heat of a substance is the amount of heat needed to raise the temperature of 1 kg of a substance by 1 0 C. </li></ul>Key Questions 4
  12. 15. Thermal insulators – Space Shuttle Tiles, Coats, Insulation
  13. 17. <ul><li>Explain why materials such as plastic foam, feathers, and fur are poor conductors of heat </li></ul><ul><li>Explain why the sand on a beach cools down at night more quickly than the ocean water. </li></ul><ul><li>If a substance can contain thermal energy, can a substance also contain heat? </li></ul><ul><li>Describe how heat is transferred from one place to another by convection. </li></ul><ul><li>Explain how a blanket keeps you warm. </li></ul>Questions Section 18.2

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