Heat flow

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Heat flow

  1. 1. <ul><li>Why does mom use cloth to take a wok? </li></ul>Example from daily life
  2. 2. Example from daily life <ul><li>Have you ever grip ice cub? </li></ul><ul><li>What do you feel? </li></ul>
  3. 3. Example from daily life <ul><li>How does the heat flow from one place to another? </li></ul>
  4. 4. HEAT FLOW
  5. 5. <ul><li>Objective: </li></ul><ul><li>To investigate the heat flow by conduction (in solid matters), convection (in liquid and gaseous matters) and radiation </li></ul><ul><li>To identify matter classified as conductor and insulator of heat </li></ul><ul><li>To Apply the heat flow concept in solving everyday physics problems such as a vacuum flask and a flat-iron </li></ul>
  6. 6. Science word <ul><li>Conduction Conductor Insulator </li></ul><ul><li>Convection </li></ul><ul><li>Radiation </li></ul>
  7. 7. <ul><li>Heat energy flows from a warm substance to a cooler substance. </li></ul><ul><li>Heat can be transferred by three processes: </li></ul><ul><li>conduction, </li></ul><ul><li>convection, and </li></ul><ul><li>radiation. </li></ul>Information
  8. 9. Heat can be transferred by three processes: conduction, convection, and radiation. Conduction is the transfer of heat along a solid object. Convection transfers heat through the exchange of hot and cold molecules. Radiation is the transfer of heat via electromagnetic (usually infrared) radiation.
  9. 10. Stone Mercury Iron Wood Glass Gold Cloth
  10. 11. Conduction <ul><li>In conduction, heat is transferred through a material by the collision of adjacent atoms or molecules </li></ul>
  11. 12. Conduction <ul><li>If you look closely, what will you observe? </li></ul>menu
  12. 13. Convection <ul><li>In convection, particles of fluid move from one place to another carrying heat energy. </li></ul>
  13. 14. Convection If you look closely, what will you observe? menu
  14. 15. Radiation Radiation is the process of transferring heat through a vacuum (without medium) menu
  15. 16. Heat flow Conduction Convection Radiation Solid Vacuum Liquid Gaseous Conductor Insulator
  16. 17. <ul><li>What does she use if she wants to keep her hand from heat ? </li></ul>Application
  17. 18. Application <ul><li>What do you use if you want to keep your drink cool or warm? </li></ul>

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